10 Best Forex API Trading Brokers in 2020

Algorithmic Trading

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APIs offered by brokers and data platforms

I’ve been looking for a broker that has an API for index futures and ideally also futures options. I’m looking to use the API to build a customized view of my risk based on balances, positions, and market conditions.
Searching the algotrading sub I found many API-related posts, but then when I actually read them and their comments, I found they’re often lacking in real substance. It turns out many brokers or data services that have APIs don’t actually support index futures and options via the API, and instead they focus on equities, forex, or cypto. So here’s the list of what I’ve found so far. This isn’t a review of these brokers or APIs and note that I have a specific application in mind (index futures and futures options). Perhaps you’re looking for an API for equities, or you just want data and not a broker, in which case there may be a few options. Also, I’m based in the US so I didn’t really look for brokers or platforms outside the US.
If you have experience with these APIs, please chime in with your thoughts. Also, I may have missed some brokers or platforms. If I did or if you see anything that needs correction please let me know.

Platform Notes
ADM Investor Services No API
Ally Invest Does not support futures instruments
Alpaca Only supports US Equities
Alpha Vantage Does not support futures instruments
AMP Broker with a huge number of platforms available including some with APIs
ApexFutures No API
Arcade Trader No API
AvaTrade Does not support futures instruments
Backtrader Not a data feed; otherwise looks cool but also looks like a one-man shop
Cannon Trading Broker with a variety of platforms, some have API access such as TT
Centerpoint No API
Charles Schwab API does not support futures instruments
Cobra No API
Daniels Trading No API
Discount Trading Broker with a variety of platforms including CQG, Rithmic, TT, some with APIs
Edge Clear Broker with a variety of platforms including CQG, Rithmic, TT, some with APIs
Eroom Now part of Dashprime. Offer a variety of APIs including CQG, TT, CBOE's Silexx, and others via FIX.
ETNA Trader Only supports equities, options (including multi-legs), ETFs, Mutual Funds (Forex with cryptocurrencies coming soon)
ETrade API seems robust but OAuth authorization needs to be refreshed via login once per 24 hours
Futures Online No API
Gain Capital Futures API available, based on .NET; unsure if they are open to retail clients
GFF Brokers Broker with a large number of platforms including some with API access
High Ridge Futures Broker with a variety of platforms including CQG, Rithmic, TT, some with APIs
iBroker API available; contact them for more info
IEX Cloud Looks great but does not support futures instruments
Infinity Futures JSON API available; contact them for more info
Interactive Brokers Client Web API looks promising if clunky
Intrinio Supports futures instruments but is expensive
Koyfin No API
Lightspeed C++ API available
marketstack API for equities available. Does not support futures instruments.
Medved Trader Windows app with a streaming API to various data sources and brokers. See comment below about API beta access.
NinjaTrader Does not support futures options
Norgate Data Not a broker; supports futures data for $270/year
Oanda Forex only; API last updated in 2018
Optimus Futures Broker with a large number of available platforms including some with API access
Phillip Capital Broker with a large number of available platforms including some with API access
polygon.io Expensive but looks slick; does not support futures instruments
Quandl API looks solid; $49/monthly for personal use, does not allow distributing or sharing data; not a broker
Quantconnect Does not expose raw data
Quantopian Does not expose raw data
Quantower Software that connects to multiple brokers and data feeds; API to their software via C# interface
Saxo Markets Broker with extensively documented API
Stage 5 Trading API available through Trading Technologies
Straits Financial Broker with several platforms available including some with APIs such as CQG, R
Sweet Futures Broker with a large number of available platforms including some with API access
TastyWorks There's an unofficial Python API
TenQuant.io Does not support futures instruments
ThinkorSwim Does not support futures instruments via the API
Tiingo Free account tier but does not support futures instruments
TradePro Broker with a number of platforms available; unclear if any are available with API access
Tradier Free developer API account for delayed data but does not support futures instruments
TradeStation Nice looking API docs and supports futures instruments; requires opening an account and a minimum balance of $100k and there’s no trial available
TradeFutures4Less Broker with a variety of platforms including CQG, Rithmic, TT, some with APIs
TradingTechnologies API looks robust; pricing starts at $700/month
TradingView Does not expose data API
Tradovate Technologies API exists, documentation unknown; need to talk to their account team
Wedbush Futures Broker with several platforms offered, a few of which have API access
WEX .NET/COM only; pricing not disclosed on website
Xignite Pricing not disclosed on website but they do support futures instruments
Yahoo Finance API Available through RapidAPI or via direct access; but it’s discontinued and unreliable
Zaner Broker with a variety of platforms including CQG, Rithmic, TT, some with APIs

Wow, this list grew longer than I originally thought it would be. If you spot a mistake, please let me know and I’ll correct it.
Edit:
- added Lightspeed API - updated Dashprime to indicate some of the APIs available - added Medved Trader to table - added marketstack to table
submitted by theloniusmunch to thewallstreet [link] [comments]

Integration with Financial Excel Add-In – Excel Price Feed

Integration with Financial Excel Add-In – Excel Price Feed

https://preview.redd.it/j4acwxvwfvr51.jpg?width=1920&format=pjpg&auto=webp&s=77df789ef696a2cdecf2e3266b550083ade09d59
Today we are happy to announce an integration with the financial Excel add-in – Excel Price Feed. Excel Price Feed is easy to use and featureful add-in for Excel owned and distributed by Coderun Technologies Ltd. It was launched in early 2019 and is regularly updated with new features, for EOD Historical Data the add-in has excellent support of Fundamental and End of Day APIs.
https://preview.redd.it/c2m0g8c3gvr51.png?width=723&format=png&auto=webp&s=4968e0e7ac2d1f4f31485ac441dadacdaf7bc825
  • Excel Price Feed is an Add-in that includes 100+ new Excel formulas for live, historical, and fundamental market data.
  • Markets include stocks, stock indices, stock options, mutual funds, ETFs, forex, commodities, and cryptocurrencies.
Learn More and download the plugin on Excel Price Feed page.
Please note that you should have both subscriptions to use this plugin with our data: from EOD Historical Data and from Excel Price Feed. Our subscriptions do not include add-in licensing and it should be ordered separately.
submitted by EOD_historical_data to EODHistoricalData [link] [comments]

Is there a free datafeed which I can feed backtrader with?

I wanted to say "Free Live Datafeed" but seems I cannot edit the title.
I am new to forex trading/algotrading, but am reading up on it recently. I wrote some simple EAs with metatrader but would like to switch to a general purpose programming language like python, which is when I came across backtrader.
With metatrader, I have the option of opening a demo account with a broker and I can run my EA against the data from the broker. I read in the documentation (please correct me if I'm wrong) that backtrader supports live feeds from three brokers, namely IB, Oanda and Live Trading.
Before I open an account with them, I would like to know if their demo accounts allow me the access to the data that I need to feed backtrader with. So my question do any of their demo accounts allow me to access the live data to feed backtrader?
Another question which is not directly related, in the Oanda page https://developer.oanda.com/rest-live/introduction/ it says that the API version 1.0 will be deprecated. And backtrader seems to be using the version 1.0 https://cookbook.backtrader.com/documentation/live/oanda/oanda/. Does anyone know if version 2.0 support will be added to backtrader?
submitted by i_want_to_ask_smth to algotrading [link] [comments]

【翻译Quora上一篇问答】中国是否正在面临一次银行危机(谈到房地产) by phoebeDD on 2016-10-04

Is China really facing a banking crisis? What are its origins?
(中国是否正在面对一次银行危机?其根源又是什么?)



According to a recent article titled China facing full-blown banking crisis, world's top financial watchdog war
ns published in the Telegraph:
(根据近期电讯文章报道:“世界顶级金融观察者发出警告:中国正在面临全面的银行危机”)
China has failed to curb excesses in its credit system and faces mounting risks of a full-blown banking crisis
(中国已对债务违约失去控制,他们正在面对随之而来的全面性银行危机)
(中国债务/GDP 占比图)


Financial Crises

International Economics

The Economy

China

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Robin Daverman, Dealmaker
Written Sep 27


Ah, but maybe you want to look around a bit and see how China’s total debt is compared with other economies, like this?
(你可能想看看其他经济体与中国的债务情况相比是怎么样的,如下图)

(G10债务分布图)
If you put China’s data on this chart, it will be somewhere around Canada and New Zealand. Guess Which Country Has Debt Of Nearly 1000% Of GDP... Shocking, isn’t it?
如果你将中国的数据插入上图进行比较的话,中国的数据大约会在加拿大和新西兰之间。猜猜看哪个国家债务大约是自己GDP的10倍....(英国)非常震惊吧
UK has almost 1000% Debt-to-GDP ratio, compared with China’s < 300% Debt-to-GDP ratio, mostly because of that over-sized financial debt - at the end of the day, the government must stand behind it. On top of that, the UK has no resource to sell, hardly any industry left, going through a divorce with EU, and almost never ever meets her fiscal targets. And yet, UK, with its near 1000% debt-to-GDP ratio, is still viewed as the gold standard among safe havens. PRESENTING: The Rosetta Stone Of The Entire Sovereign Debt Crisis Why? Because UK issues debt in her own currency. And who prints the pound? The UK government.
英国的债务/GDP占比将近1000%而中国只是小于300%,其原因是其过于庞大的金融债务——政府最终将不得不为之站台。在此之上,英国没用可出售的资源,没有任何本国工业,正在脱离欧盟,而且英国基本上从来没有达成其财务目标。即使如此,英国仍然被某些传媒视为安全经济体的黄金标准。其原因就是英债都以英镑的方式结算。那么是谁印英镑的呢?英国政府。
Then you take a look at Japan, wow that’s 600%+ debt-to-GDP ratio! But - Japan’s debt is not only mostly internal, in Japanese Yen, but also with 0% or even negative interest. You can roll this kind of debt over practically forever. That’s why people have been yelling about Japanese debt for the last 20 years, and nothing happens.
然后你看看日本,将近600%的债务/GDP占比!但是,日本的债务几乎都是内部的,以日元的形式出售的债务,而且日本是0利率甚至是负利率。实际上这种债务你可以无限积累下去(经济常识:如果是负利率,政府只要保持债务不变,多出来的部分会自行消失)。这就是为啥人们对日债担心了20年但屁事没有发生。
Then you take a look at those economies that have blown up on debt:
Argentina: Government/Sovereign debt in USD, with jurisdiction in New York!Greece: Government/Sovereign debt in Euro, with jurisdiction in Brussels!Iceland: External financial debt → nationalized into Government/Sovereign debt in USD and Euro alone was 700%+ GDP in 2008, with jurisdiction in New York and Brussels.
然后你看看那些因债务问题毁掉的经济体:
阿根廷:政府/主权债务以美元形式结算,其裁判权在纽约!希腊:政府/主权债务以欧元方式结算,其裁判权在布鲁塞尔!冰岛:外部金融债务→债务国有化后2008年政府/主权债务以美元和欧元的形式达到GDP的700%,其裁判权在纽约和布鲁塞尔
Then you look at China, with her debt almost entirely internal, in Chinese RMB to Chinese citizens, government debt at 55%, lower than the US, Japan, and EU average, in her own currency. China’s external debt is about 9% of GDP, globally ranked 184th (less than North Korea, similar to Kosovo) - anyway you look at it, it’s hardly the kind of material to make a banking crisis. China is borrowing a little bit from her own piggy bank. Argentina/Greece/Iceland were borrowing a lot from the Mafia.
然后你看看中国,中国的债务基本都是内部以人民币结算的。中国政府债务只占总债务的55%,比美国,日本和欧盟都要低,再次强调,其债务以人民币结算。中国外部债务只占GDP的9%,全球排行184位(比朝鲜低,比科索沃高)。无论怎么看,你都不会看到中国有任何银行危机的迹象。中国只是向其国内贪心的银行借钱。阿根廷/希腊/冰岛可是像美国欧盟这些黑手党借钱。
PS: The most significant increase in China’s debt is in the financial sector, driven by rising real estate price (which means higher value of housing loans). Right now, the Chinese government is basically using it as a tool to do macro-economic engineering. The goal is to cap urban growth in top tier cities (Beijing, Shanghai, etc.) and push the economic growth to second- and third- tier cities (Hangzhou, the city that just hosted G20, is an example.http://www.g20.org/English/Hangzhou/About/index.html Now you can look back and see why the Chinese government decided to host G20 in a city nobody has ever heard of). This is clearly stated by the Chinese government like 100 times since last year in the official news channels. The reason? Top tier Chinese cities like Shanghai (25 million) already have more city residents than the whole nation of Australia! The metropolitan area of Shanghai (44 million) has more people than the entire population of Canada! In one city! Beijing’s population grew by 8 million within the last decade! The place is simply full.List of cities in China by population and built-up area
PS: 中国最显著的债务增长是在其金融领域内不断升高的房价造成的(不断增高的房贷造成债务问题)。现在中国政府正在利用房价作为宏观经济调控的工具。其目的是限制一线城市的城市化进程和加速二三线城市的发展(刚刚举办了G20的杭州就是个例子,现在你就能知道为啥中国政府将G20放在一个没人听说过的城市举行了)。这些政策中国政府已经在官媒上宣布了无数次。原因就是一线城市,例如上海(2500万人口),其居民数量比阿根廷全国人口还要多!上海都市圈(4400万人口)的人口数量比加拿大全国还要多!北京人口数量在过去的10年内增长了800万!这些城市的人口数量已经饱和了。
In addition to real estate prices, the Chinese government is also doing stuff like restricting residents permits, disallowing second or third homes, even restricting jobs to local residents, everything to say “this place is full. We have these other nice choices, with lower housing prices. Go there.” Young people complaining about housing prices in tier-one cities? But that’s the whole point. The debt you have to take on to live in tier-one cities SHOULD SCARE YOU OFF. The Chinese government is trying to stop the influx of people pouring into tier-one cities, and get these smart and energetic youths to go build two, three, four, five. … more Shanghai’s in other parts of China. 1.4 billion people can’t all fit into tier-one cities.
除了以房地产为手段,中国政府也加强控制了居住证的发放,禁止第二/三套房买入甚至对本地居民的工作种类进行限制,这些都是为了表达一个意思:这些地方都人满为患了。二三线城市有更低的房价和更好的生活条件,快点去那里吧!年轻人都在抱怨一线城市的高房价?但这就是中国政府想要的。你在一线城市生存需要的代价会把你吓退。中国政府正在尝试控制一线城市的人口流入而让有技术和充满活力的年轻人去建设二三四五线城市——让更多的上海出现在国家的其他地方。14亿人口是没可能全部都聚集在一线城市的。
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Paul Denlinger, Involved in China economics study
Written Sep 27


There is too much debt, and a lot of it is likely to turn into bad debt, but that does not equal a banking crisis.
是因为中国贷款太多了,而这些贷款大多数会变成不良贷款,但这些都不等银行危机
Banking crisis may be a nice term to bandy around and get clicks and headlines, but does not really explain what is going on.
银行危机或许是一个十分吸引眼球的头条,但是根本就不能解释实际的情况
There was a lot of debt financing, especially after the 2008 subprime mortgage crisis in the US. In order to keep the economy on a steady keel, the Chinese government, through its banks, pumped money to Chinese state-owned enterprises, in order to keep high employment and maintain an image of “growth”. A lot of this money then found its way into the underground banking system through “wealth management products” and other means. A lot of this has turned into bad debt.
中国政府有过很多次债务融资,特别是08年美国次贷危机之后。为了稳住经济增长,中国政府通过银行将大量人民币注入到国企内以维持就业率和高增长的形象。但这些钱最终大都以理财产品和其他形式流进了地下钱庄。这些大部分都变成了不良贷款。
Another problem area, which frequently overlaps with the “wealth management products” is the local government financing vehicle used to fund local property development, which I have discussed here: Paul Denlinger's answer to Why does China have so many ghost towns?
另一个有问题的领域,和“理财产品”有莫大关联的,就是地方政府为当地基础建设所采用的金融工具(我在这个地方有详细的分析:https://www.quora.com/Why-does-China-have-so-many-ghost-towns/answePaul-Denlinger?srid=tR&share=22b99cfc
What is likely to happen in China is that growth will slow down in some areas, while there will be certain newer parts of the economy which will continue to grow. If the Chinese government is able to support the newer parts of the economy and help them to grow, while cutting back on loans to the weaker parts of the economy, it may be able to handle this transition better.
最可能发生的情况就是中国的经济增长将会放缓,但是肯定会用新的增站点。如果中国政府能支持新的增长点而且能减低夕阳工业的不良贷款率,那么或许能更好地度过过渡期。
This is exactly what the Chinese government is trying to do and you can read about it here:Here is how China is going to quietly save its economy
这些正是中国政府正在尝试去做的,你可以读读这个文章了解一下:http://www.scmp.com/news/china/economy/article/2022491/china-deploys-policy-banks-stealth-mission-stimulate-growth
So, if you are expecting there to be a dramatic run on the banks, and the Chinese people to take to the streets and overthrow the Chinese Communist Party, and become a full-blown democracy like Taiwan, Japan or South Korea, you are very likely to be disappointed.
所以,如果你是期待一次强烈的bank run(自行百度啥是bank run),然后中国人民上街推翻TG,中国大陆变成与台湾,日本韩国一样的政体,那么你要失望了。
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Nikhil Ambhorkar, Self studied Finance.
Written Sep 26


Is China facing a Banking crisis?
中国是在面临一个银行危机吗?
Yes.

Is it facing a full blown Banking crisis?
中国正在面临一个全面性的银行危机吗?
No.

Combined debt of China is almost 300% of its GDP. But the the categorized in 4 parts as it is shown in the image with the question too.
中国的总债务大概是GDP的300%。但是分在了如图所示的4个领域内。
The corporate debt has the lion's portion of the total debt. The household debt and non corporate debt are nothing to worry about because it is less many other developed countries and has some room to grow.
公司债务在总债务中占了大头。个人债务和非公司债务根本没啥可担心的因为这些比大多数发达国家还要低所以还有增长的空间。
Government Debt is not too big when compared to standards set by many global institutions like IMF, World Bank, etc.
政府债务以多数国际组织,例如世行和IMF,设定得标准来看其实不高。
The only major concern which is of a serious magnitude is the corporate debt. This is also reiterated by many economists.
最主要的关注点就是公司债务了。许多经济学家都重申了这点无数次了。
Now the problem with China is that data that comes out of major Chinese institutions is murky so their are many different types of estimates by many different institutions but the common theme in it is corporate debt and its size.
中国最大的问题就是中国国内组织公布的数据来源不清晰所以不同的国际组织对中国经济的实际情况估算会不一样。但所有组织最关心的都是中国的公司债务与其规模。
Corporate debt consists of debt owned by state owned corporations and private corporations. Private corporations in China are generally crowded out by the state owned corporations because of connections and political agenda.
公司债务又分成了国企和私企的债务。中国私企大多数收到国企排挤,这是有政体造成的。
Many state owned corporations have invested into unproductive projects as a result of excess boost given by government after 2008 to prop up the economy. This has resulted in a huge amount of NPAs. So, in all the major problem is state owned corporations piling up huge amount of debt. To solve this problem, the government tried to convert the debt into shares which the bank owns and can recover money through profit dividends but this was one of the causes for last year's stock market crash.
在08年过度的经济刺激政策下,很多国企在许多无效益项目上投了许多钱。这造成了大量的无效能资产。所以,最大的问题是国企堆积了大量债务。为了解决这个问题,政府正在尝试将国企的债务转化为股份,那么银行就能将债务转化为红利而最终将债务收回了。但这造成了上年的股灾.....
Hence, it is a big crisis but not the one government cannot handle with so much trade surplus and forex reserves. But actions are definitely needed to stop it from growing into a bigger problem.
所以,这是一个危机但仍然是政府能控制的,毕竟中国政府有大量贸易顺差和外汇储备。但是仍然需要实际行动来防止事态的扩展。
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submitted by robot301_01 to kfq [link] [comments]

#For Review: 'Intrinsically Tradable Tokens' (ITT's) are their own exchange

For Review: 'Intrinsically Tradable Tokens' (ITT's) are their own exchange

Introducing Intrinsically Tradable Tokens, ERC20 compliant tokens in which you can buy and sell directly from the contract.
Ropsten 0xa9e001bebe4b281f7229b0305f553ab3c511fef5
Live 0xa15c784319fa96d3E36cFE97fbadD89Ec704A8dc

ITT's extend the ERC20 API with:

buy(uint price, uint amount, bool make) sell(uint price, uint amount, bool make) cancel(uint price) withdraw(uint ether) 
and other ancillary exchange state getters (see Github repo for full API) such as :
etherBalanceOf(address holder) getBook() getOrdersOf(address trader) spread(bool side) 
The intrinsic exchange functionality works on a FIFO matching maketaker algorithm. A new order may be iteratively filled by multiple make orders on the book or if unfilled, can be put on the book itself as a make order.
ITT demo contracts have been deployed on the Ropsten test chain on which a number of Buy and Sell orders have already been placed for you to play with. The demo ITT and future, more functional ITT's can be can be interacted with using the front end DAPP ITTDesk.

Use Cases

This demo ITT serves to demonstrate the exchange functionality of a basic ITT contract and does not have much intrinsic value in the token itself beyond being a purely speculative coin.
The ITT API and base contract are open source and offered to the community in order to extend or attach value adding functionality to the token side.
As is, crowd funding and token sales become as trivial by simply placing ask orders (see Self Funding below).
Better still would be to extended ITT functionality to make a 'Payable ITT' which becomes a simple but highly versatile pay to an unknown many mechanism which can distribute payments according to proportional holdings. Such holdings might represent shareholders, a rewards system or perhaps be used to fund and manage a DAO's project funds. (I do have a Payable ITT but will not likely release it until the community has confidence in the basic ITT contract)
Other value adding developments might be to couple ITT's to fiat currencies for truly low friction decentralised forex.

Current State of Development

As deployed, the ITT Demo contract is yet to undergo extensive testing and formal verification. It appears to work as intended (unless compiled with 0.4.5+commit.b318366e! My first launch attempt drove me crazy until that bug was announced). The contract on both chains have been verified on etherscan.io etherscan.io.
The ITTDesk app is very much in alpha release, minimalist and clunky in it's function. It is written on Meteor and attempts to use Mist styling and elements. Probably best just to clone the repo and run it up in Meteor at this stage. It features intelligent ask/bid/buy/sell trade buttons to assisting in validating user inputs in the order fields.
I am not an experienced web developer, so feed back, suggestions, criticisms are most welcome. In particular, I've not been able to work up the filters without causing browser timeout.

How does it work?

The order book utilises a mapping of 'Circular Linked Lists (CLL)' from the LibCLLi library to order and lookup the booked prices and iterate the FIFO's at each price. Each FIFO in the mapping is keyed by its price and holds all the addresses of traders who have made orders at that price. A trader can only have a single order at any particular price. An attempt to book another order at the same price will adjust and put the order at the back of the FIFO queue. This prevents FIFO hogging in which a trader might otherwise starve other orders by continually topping up their own.
A second trivial mapping holds the actual order amounts. It is keyed by a SHA3 hash of the trader's address with the price of the order (and is actually what limits the trader to one price, one order).
The CLL's heads are static at mapping key '0'. To use as a FIFO, nodes are simply inserted previous to the head and removed from next to the head. A FILO (stack) can be implemented with equal simplicity.
In the case of the price list, the links either side of the head are the highestBid (previous) and lowestAsk (next) making the head node itself the market spread. The price list is artificially bound to minimum (uint 1) and maximum (uint 2**128) prices. New price nodes are inserted relative to the head (spread) after iterating through an order search.
Looping operations in Smart Contracts can be bug prone and costly, especially with state mutations in each loop as in the ITT's matching algorithm. For this reason, the order matching loop is dynamically limited by the gas supply from msg.gas and will exit with a partially filled order rather than throw it. The remainder does not get put on the book as a make order as it would cause a bid/ask collision at that price. Because of this looping, gas cannot be estimated and it is up to the trader to consider the costs and adjust the amount of gas prior to ordering.
The matching algorithm is not without architectural efficiency however which almost halves the number to calls to STORE by virtualising (caching to memory) the taker's state variables prior to the matching loop and writing back to store once the matching and making operations exit.

Security and Resilience

ITT's hold ether balances and therefore are presumed to be targeted by hacking attempts. A number of security features and practices have therefore been programmed into the contract.
All external or payable state mutating functions are 'reentry protected' by a mutex which is set and cleared in the internal function safeSend(), which is called only by the public function withdraw(). This practice ensures a single entry and exit.
The architecture also separates entry validation logic and parameter preparation which is kept in the external/payable functions, from state mutation logic which is kept in the internal functions. This allows for a secure, flexible, inheritable API/interface layer from which to extend the contract while keeping the basic ITT internal functionality the same.
In the ITT Demo, the default function is unimplemented and therefore throws if payments are sent to anything other than the payable buy() function.
Attention must also be drawn to some rather unconventional use of uint math in the matching loop. Elsewhere, the contract uses explicitly safe maths functions, however the nature of an exchange function requires numerous inverse and signed integer operations. It was found that casting between int and uint became an onerous task with potentially unpredictable outcome and a design decision was made to simply treat uint as signed within the matching loop. In this case -1 == 2**256-1 and is used in multiplication to change the sign of trade amounts during matching.
In light of the signed uint adoption, a further mathematical constraint was placed on the maximum price and amount allowed being 2**128 which prevents any multiplication overflows.

Testing

Given that this contract is Proof of Concept deployment primarily for public review, it should be considered insecure. It has been tested for functionality but no exhaustive testing regime or formal verification has been put against it. It is undeniably a big ugly contract with complex logic and so should be viewed with suspicion.
Interacting with the Live contract is thereby at your own risk!

Self Funding

Being the deploying owner of this Demo ITT, I am granted the full balance of tokens and have placed both ask and bid orders as examples. Purchasing my Ask orders on the Live chain does transfer real ether to my balance and so I am trailing this as a channel for funding my development efforts rather than chasing bounties, competitions, donations, (a real job) or what have you. If you buy tokens here, you could consider it as a much appreciated donation which you might also be able to return a speculative profit from! It would certainly make my life easier. :)

Who Am I?

My name is Darryl Morris AKA o0ragman0o. I'm an independent (and some what isolated) Australian Ethereum developer. Though fairly quite, I've been following Ethereum developments since November 2014 (PoC 6) and have been small time mining since Olympic, though not now with expensive Australian electricity. I am best known on [forum.ethereum.org](forum.ethereum.org) where I am a mod. I've been crypto aware since 2009 when I tried bitcoin in it's infancy. I got 71/70 marks for Griff Green's notorious 'DAO Ninja' homework though obviously needed 72 to recognise the complex of vulnerabilities in that code!
My interests are in developing delegative democracy technologies with which to render all politicians obsolete (particularly ones beginning with 'T'). To that end I've developed the ITT contract as a funding component of a democracy DAO framework I call 'Ethenian DAO'.
Looking for interested collaborators.
Cheers Darryl
submitted by o0ragman0o to ethereum [link] [comments]

For Review: 'Intrinsically Tradable Tokens' (ITT's) are their own exchange

For Review: 'Intrinsically Tradable Tokens' (ITT's) are their own exchange

Introducing Intrinsically Tradable Tokens, ERC20 compliant tokens in which you can buy and sell directly from the contract.
Ropsten 0xa9e001bebe4b281f7229b0305f553ab3c511fef5
Live 0xa15c784319fa96d3E36cFE97fbadD89Ec704A8dc

ITT's extend the ERC20 API with:

buy(uint price, uint amount, bool make) sell(uint price, uint amount, bool make) cancel(uint price) withdraw(uint ether) 
and other ancillary exchange state getters (see Github repo for full API) such as :
etherBalanceOf(address holder) getBook() getOrdersOf(address trader) spread(bool side) 
The intrinsic exchange functionality works on a FIFO matching maketaker algorithm. A new order may be iteratively filled by multiple make orders on the book or if unfilled, can be put on the book itself as a make order.
ITT demo contracts have been deployed on the Ropsten test chain on which a number of Buy and Sell orders have already been placed for you to play with. The demo ITT and future, more functional ITT's can be can be interacted with using the front end DAPP ITTDesk.
This demo ITT serves to demonstrate the exchange functionality of a basic ITT contract and do not have intrinsic value in the token itself beyond being a purely speculative coin.
The ITT API and base contract are open source and offered to the community in order to extend or attach value adding functionality to the token side.
The simplest example of an extended function ITT might be to make a 'Payable ITT' which becomes a simple but highly versatile pay to an unknown many mechanism which can distribute payments according to proportional holdings. Such holdings might represent shareholders, a rewards system or perhaps be used to fund and manage a DAO's project funds. (I do have a Payable ITT but will not likely release it until the community has confidence in the basic ITT contract)
Other value adding developments might be to couple ITT's to fiat currencies for truly low friction decentralised forex.

Current State of Development

As deployed, the ITT Demo contract is yet to undergo extensive testing and formal verification.
The ITTDesk app is still minimalist in it's function though is written on Meteor and attempts to use Mist styling and elements. I am not an experienced web developer, so feed back, suggestions, criticisms are most welcome.

How does it work?

The order book utilises a mapping of 'Circular Linked Lists (CLL)' from the LibCLLi library to order and lookup the booked prices and iterate the FIFO's at each price. Each FIFO in the mapping is keyed by its price and holds all the addresses of traders who have made orders at that price. A trader can only have a single order at any particular price. An attempt to book another order at the same price will adjust and put the order at the back of the FIFO queue. This prevents FIFO hogging in which a trader might otherwise starve other orders by continually topping up their own.
A second trivial mapping holds the actual order amounts. It is keyed by a SHA3 hash of the trader's address with the price of the order (and is actually what limits the trader to one price, one order).
The CLL's heads are static at mapping key '0'. To use as a FIFO, nodes are simply inserted previous to the head and removed from next to the head. A FILO (stack) can be implemented with equal simplicity.
In the case of the price list, the links either side of the head are the highestBid (previous) and lowestAsk (next) making the head node itself the market spread. The price list is artificially bound to minimum (uint 1) and maximum (uint 2**128) prices. New price nodes are inserted relative to the head (spread) after iterating through an order search.
Looping operations in Smart Contracts can be bug prone and costly, especially with state mutations in each loop as in the ITT's matching algorithm. For this reason, the order matching loop is dynamically limited by the gas supply from msg.gas and will exit with a partially filled order rather than throw it. The remainder does not get put on the book as a make order as it would cause a bid/ask collision at that price. Because of this looping, gas cannot be estimated and it is up to the trader to consider the costs and adjust the amount of gas prior to ordering.
The matching algorithm is not without architectural efficiency however which almost halves the number to calls to STORE by virtualising (caching to memory) the taker's state variables prior to the matching loop and writing back to store once the matching and making operations exit.

Security and Resilience

ITT's hold ether balances and therefore are presumed to be targeted by hacking attempts. A number of security features and practices have therefore been programmed into the contract.
All external or payable state mutating functions are 'reentry protected' by a mutex which is set and cleared in the internal function safeSend(), which is called only by the public function withdraw(). This practice ensures a single entry and exit.
The architecture also separates entry validation logic and parameter preparation which is kept in the external/payable functions, from state mutation logic which is kept in the internal functions. This allows for a secure, flexible, inheritable API/interface layer from which to extend the contract while keeping the basic ITT internal functionality the same.
In the ITT Demo, the default function is unimplemented and therefore throws if payments are sent to anything other than the payable buy() function.
Attention must also be drawn to some rather unconventional use of uint math in the matching loop. Elsewhere, the contract uses explicitly safe maths functions, however the nature of an exchange function requires numerous inverse and signed integer operations. It was found that casting between int and uint became an onerous task with potentially unpredictable outcome and a design decision was made to simply treat uint as signed within the matching loop. In this case -1 == 2**256-1 and is used in multiplication to change the sign of trade amounts during matching.
In light of the signed uint adoption, a further mathematical constraint was placed on the maximum price and amount allowed being 2**128 which prevents any multiplication overflows.

Testing

Given that this contract is deployed primarily for public review, it should be considered insecure. It has been tested for functionality but no exhaustive testing regime or formal verification has been put against it. It is undeniably a big ugly contract with complex logic and so should be viewed with suspicion.
Interacting with the Live contract is thereby at your own risk!

Self Funding

Being the deploying owner of this Demo ITT, I am granted the full balance of tokens and have placed both ask and bid orders as examples. Purchasing my Ask order on the Live chain does transfer real ether to my balance and so I am trailing this as a channel for funding my development efforts rather than chasing bounties, competitions, donations, (a real job) or what have you. If you buy tokens here, you could consider it as a donation which you might also be able to return a speculative profit from! It would certainly make my life easier. :)

Who Am I?

My name is Darryl Morris AKA o0ragman0o. I'm an independent (and some what isolated) Australian Ethereum developer. Though fairly quite, I've been following Ethereum developments since November 2014 (PoC 6) and have been small time mining since Olympic, though not now with expensive Australian electricity. I am best known on [forum.ethereum.org](forum.ethereum.org) where I am a mod. I've been crypto aware since 2009 when I tried bitcoin in it's infancy. I got 71/70 marks for Griff Green's notorious 'DAO Ninja' homework though obviously needed 72 to recognise the complex of vulnerabilities in that code!
My interests are in developing delegative democracy technologies with which to render all politicians obsolete (particularly ones beginning with 'T'). To that end I've developed the ITT contract as a funding component of a democracy DAO framework I call 'Ethenian DAO'.
Looking for interested collaborators.
submitted by o0ragman0o to ethtrader [link] [comments]

INVACIO

INVACIO
INVACIO / ICO A Complex of Solutions Grounded in Multi-Agent System Artificial Intelligence
Invacio, found online at Invacio.com, combines artificial intelligence, communications, finance, and big data to “revolutionize every industry it touches.” Find out how it works in our review.
What is Invacio INV? Invacio is an artificial intelligence platform backed by five years of development. Invacio’s platform is called the Multi-Agent System AI (Jean).
Development of the Multi-Agent System AI was led by William James Dalrymple West in consultation with experts from NASA and FB-HHVM. Invacio’s AI works constantly to seek out and mine data from all available data sources. Jean is also able to understand written and spoken language in real-time. She can interpret images and actions. She can even scan the deep web for data, or access live news channels, social media, and 100,000+ live CCTV and satellite streams worldwide.
The ultimate result of all of this data collection, according to the official Invacio website, is “an artificial intelligence so sensitive to the world and its changes the solutions she is reaching stand to revolutionize areas as diverse as big data, communications, research, online privacy, the exchange markets and even security and intelligence.”
Invacio Features Some of the core features of Invacio and its Multi-Agent System AI or Jean platform include:
Deep Learning: Invacio’s distributed AI resolves some of the world’s most complex problems. The platform’s scalable, intelligent environments enable AI to turn noise into data and data into information with unprecedented speed and ingenuity.
Self-Learning Computation: Invacio’s AI continually evolves as it explores and develops its storehouse of streaming and historic data. The AI adapts to circumstantial changes or demands, improving its models through experience and becoming more complex, subtle, and reliable.
Scalable: Invacio’s AI infrastructure is built for stability. Invacio “will be ready for everything the world of big data and AI could demand.”
Invacio Products and Solutions Invacio has a number of products and solutions built on its AI framework, including all of the following:
Network Invacio’s Network is a social network available for consumers and commercial users. The social network is distinguished by features like its AI-backed user-driven information feeds and stickers, including things like real-time stock market tickers.
Network also has detailed charts allowing you to track stocks in real-time, AI-driven market analysis, location-specific user-reviewed content and suggestions, and more. Basically, Invacio’s Network wants to use AI to change the world of social network.
Commercial users, meanwhile, can interact with the platform to make business decisions based on the social data of users.
Invacio Tamius Invacio has a decentralized blockchain banking system called Tamius. Tamius is built upon Invacio’s AI technologies.
The platform integrates crypto and traditional fiat currencies in a single, perfectly secure, user-friendly multi-channel platform that makes high-speed cross-currency and cross-border transactions simple and intuitive.
Tamius aims to revolutionize fiat and cryptocurrency banking overall by providing the functionalities expected of fiat-based banking services along with a number of additional innovations.
Aquila Aquila collects and tracks companies from all of the world’s major stock exchanges, giving the user all of the relevant trading information required in a single UI. Users can login before the markets open to receive end of day predictions for 2995 separate stocks and forex pairs.
Aquila has three core components, including Agnes, Archimedes, and Tomahawk:
Agnes: Agnes provides stock market analysis based on AI, deep learning, and machine learning.
Archimedes: Archimedes is a human/AI hedge fund that allows access to hedge fund level returns on investment to any subscriber independent of their net worth.
Tomahawk: Tomahawk offers long-range trading driven by AI making predictions of future values over a year in advance, allowing access to a lower risk, long-term hedge fund available to anyone regardless of net worth.
Invmail Invmail is an end-to-end encrypted communications platform consisting of email, video conferencing, and voice messaging. The platform uses a zero knowledge server to ensure no record of communication is retained. Sensitive conversations can take place online in complete privacy.
As the Invacio website explains, “Invmail is the online equivalent of having a face to face meeting in a locked bank vault only much more convenient.”
Other Invacio Services Invacio’s other AI services include its commercial and governmental APIs, which include things like voice recognition APIs to help companies and governments develop better services.
Invacio also offers a platform called Alise, which provides users with real-time feedback based on their social media mentions and other media mentions worldwide. It allows companies or individuals to gauge public opinion on an organization, product, or brand. Governments can also use Alise to monitor how potential policies are understood or being discussed by the populace.
Invacio also has a security platform called Invacio Security. This platform is able to monitor an environment for people of interest 24 hours a day, 7 days a week using data collected from CCTV systems. In other words, Invacio Security will monitor thousands of connected CCTV feeds to identify any possible people of interest.
Finally, Invacio has two divisions dedicated to all of the products listed above, including an applied AI division and a research division.
Who’s Behind Invacio INV? Invacio Holdings, Ltd. is headquartered in London, UK. The company was founded by William J D West (Founder and Chief Vision Officer). The idea for Invacio began in early 2010 when West “embarked on a personal quest to learn more about AI”.
The remaining Invacio team includes senior Wall Street executives, coders, scientists, engineers, statisticians, and entrepreneurs.
Invacio INV ICO Conclusion Invacio is an AI platform backed by five years of development. That AI platform is being integrated into a number of different areas. Invacio can scan tens of thousands of CCTV feeds worldwide, for example, to identify a person of interest. Invacio can also be used to monitor cryptocurrency and fiat currency markets, providing detailed analyses and predictions on future market movements.
To learn more about Invacio and how it plans to integrate AI into other aspects of daily life, visit online today at :
INVACIO
submitted by anhard88 to u/anhard88 [link] [comments]

Little Known AI Company Makes World Debut In Front Of United Nations

Founded by William J D West around 5 years ago and developed in stealth mode since then, Invacio is a tech company unlike any other in the world and because of this, it is attracting attention from some fairly high up places. Governmental discussions are ongoing around the world to implement their technology in various ways.
But what is it exactly that invacio do that instigated the invitation to make their worldwide debut presentation (coming out if you will) in front of world leaders at the UNESCAP FDI meeting in Thailand on November the 3rd last year?
The answer to that is quite hard to formulate without going off on multiple tangents all at once, so, I will give a brief outline and then try to cover some more specifics in order that you can try to paint the picture for yourself more clearly…All I will say before launching into this is open your mind and try to see all the potential uses of this technology.
Invacio is primarily an applied artificial intelligence company that has created a multi-agent neural network that analyzes the world’s informational output, digests it, correlates the various disparate facts and ultimately delivers actionable intelligence across any sector of commerce, industry, society or government possible.
Regardless of the source of this data be it: NASAs satellite feeds, live news, digital radio, video broadcasts, social media twitterings etc or live market data from world exchanges or even historical digitized data banks like the National Library of Congress and thousands of others, they are all relentlessly probed and itemized by a system which is self learning and always hungry for more. Since the system was switched on, an ever growing number of proprietary datasets have been created well over 2 billion as this story is being written. Ok, so Invacio has a lot of information from all over the world: but what exactly is its use? And, what can Invacio do that any other information rich organisation with a decent search engine can’t?
Well, this is where it truly comes into its own you see, it doesn’t pull the information together, stick a label on it and forget about it until someone asks for it. No, Invacio actively seeks to place all the information it holds into context with all the rest so that comparisons, parallels and connections can be created. Why? Because their system is designed to understand the world and guide us where it can. An example of this which was given during the presentation to the United Nations was that of crisis management during the Californian wildfires last year – Within a second of the first tweet relating to the fires starting being sent, Jean (that is what they call the full operational system) was aware and rapidly pulling together every type of relevant information available. Everything from geographical data, historically relevant time based records of vineyards (soil composition, state of vines or ripeness of fruits), meteorological details (live conditions and historical in relation to similar events globally)…… you get the picture.
In the second second Jean would have been able to direct the emergency response and do as much as possible to limit the ongoing damage being caused by the fire by predicting the way the emergency would develop having analysed all available information and extrapolating.
As a bonus, in the 3rd second Jean could have told you whether it was worth buying wine futures or no.
That is one example,imagine the benefits of having that kind of analysing power in your sector:
Hedge funds… highly accurate predictions on shares, indices, commodities and forex (Agnes, Archimedes, Aquila and Tomahawk), Market intelligence… knowing what the world is thinking about your brand, competitor, client or product in real time (Alise), Security… maintaining secure facilities through the application of advanced facial recognition through security cameras(Sauron) or alternatively simply plug your organisation straight into Invacio API and pull out the information you need to make your world a better place.
Invacio ICO Invacio are currently undergoing an ICO (initial coin offering) in order to fund the roll out of various divisions that are underpinned by Jean. The coins sold during the sale will be directly connected to the use of Invacios raft of products. Whether they are used to pay whole subscription fees for AI fintech predictive services or to attract a discount against a corporate market intelligence monitoring account through the Alise division these coins will provide a great amount of utility within the Invacio group.
submitted by InvacioOfficial to u/InvacioOfficial [link] [comments]

INVACIO AI Company Makes World Debut In Front Of United Nations

Little Known AI Company Makes World Debut In Front Of United Nations
Founded by William J D West around 5 years ago and developed in stealth mode since then, Invacio is a tech company unlike any other in the world and because of this, it is attracting attention from some fairly high up places. Governmental discussions are ongoing around the world to implement their technology in various ways.
But what is it exactly that invacio do that instigated the invitation to make their worldwide debut presentation (coming out if you will) in front of world leaders at the UNESCAP FDI meeting in Thailand on November the 3rd last year?
The answer to that is quite hard to formulate without going off on multiple tangents all at once, so, I will give a brief outline and then try to cover some more specifics in order that you can try to paint the picture for yourself more clearly…All I will say before launching into this is open your mind and try to see all the potential uses of this technology.
Invacio is primarily an applied artificial intelligence company that has created a multi-agent neural network that analyzes the world’s informational output, digests it, correlates the various disparate facts and ultimately delivers actionable intelligence across any sector of commerce, industry, society or government possible.
Regardless of the source of this data be it: NASAs satellite feeds, live news, digital radio, video broadcasts, social media twitterings etc or live market data from world exchanges or even historical digitized data banks like the National Library of Congress and thousands of others, they are all relentlessly probed and itemized by a system which is self learning and always hungry for more. Since the system was switched on, an ever growing number of proprietary datasets have been created well over 2 billion as this story is being written. Ok, so Invacio has a lot of information from all over the world: but what exactly is its use? And, what can Invacio do that any other information rich organisation with a decent search engine can’t?
Well, this is where it truly comes into its own you see, it doesn’t pull the information together, stick a label on it and forget about it until someone asks for it. No, Invacio actively seeks to place all the information it holds into context with all the rest so that comparisons, parallels and connections can be created. Why? Because their system is designed to understand the world and guide us where it can. An example of this which was given during the presentation to the United Nations was that of crisis management during the Californian wildfires last year – Within a second of the first tweet relating to the fires starting being sent, Jean (that is what they call the full operational system) was aware and rapidly pulling together every type of relevant information available. Everything from geographical data, historically relevant time based records of vineyards (soil composition, state of vines or ripeness of fruits), meteorological details (live conditions and historical in relation to similar events globally)…… you get the picture.
In the second second Jean would have been able to direct the emergency response and do as much as possible to limit the ongoing damage being caused by the fire by predicting the way the emergency would develop having analysed all available information and extrapolating.
As a bonus, in the 3rd second Jean could have told you whether it was worth buying wine futures or no.
That is one example,imagine the benefits of having that kind of analysing power in your sector:
Hedge funds… highly accurate predictions on shares, indices, commodities and forex (Agnes, Archimedes, Aquila and Tomahawk), Market intelligence… knowing what the world is thinking about your brand, competitor, client or product in real time (Alise), Security… maintaining secure facilities through the application of advanced facial recognition through security cameras(Sauron) or alternatively simply plug your organisation straight into Invacio API and pull out the information you need to make your world a better place.
submitted by InvacioOfficial to u/InvacioOfficial [link] [comments]

Best/Cheapest source of live ECN market data feed (FIX API)

Hey guys. Awesome sub you got here. I'm a software engineer and I'm interested in learning more about the forex markets. Before I put any real money down, I want to analyze the data and come up with some hypotheses and backtest them.
I'm looking for a live data feed of prices, volume, market depth, etc that I can use for the analysis.
Do you guys know of a cheap/free source of such data? It needs to be ECN data or as close as possible. And historical data would be nice but not necessary, I'm looking more for a live feed.
I've look at various ECN brokers but they only offer their FIX API to institutional investors with hundreds of millions of USD in trades per month.
The cheapest I've seen is Interactive Brokers, but their minimum account balance is USD10k.
Please let me know if you know of other brokers or have any other ideas about attaining this kind of data.
Thanks
submitted by drkenta to Forex [link] [comments]

Algo Bridge  Live Trading Demostration  Web-based Algo Trading platform LIVE TRADING AND REALTIME DATA FROM NEW UPSTOX 3.0 FREE API FOR NINJATRADER, AMIBROKER, MT4, MT5 Excel Real Time Forex Rates Real Time data Feed setup Video Part 1 FIX API for Algorithmic Trading @ Darwinex - Introduction Accessing MT Newswires Live Briefs PRO Global Markets in IQFeed Loading environment variables with Vite or Svite (for Svelte)

Welcome to the Free Forex API !! This API is available free of charge to all web developers who need to show the most accurate, live, foreign exchange rates for all the major currency pairs. The API is simple and easy to use and best of all there is no registration required! Simply make a call to the end point as described in the API Documentation. All that we ask is that you kindly add a ... Forex Live Data Feed Api. Tradeview Forex. They have historical data for NSE listed equities. Segment Fee ()* Capital Market Segment 2,75,000 Futures & Option Segment 2,75,000 Wholesale Debt Market Segment 1,40,000 Currency Derivatives Segment 1,40,000 Annual Charges for 2 minute snapshot/delayed data: TWS API Forex CASH Historical Data Request?. Historical data of nse stocks in excel. Free ... It is easy to integrate our API into your existing platform, giving you access to 25 years of historical data for over 38,000 forex pairs and rates from over 200 currencies, commodities and precious metals. As a market maker, we have direct access to real-time FX rates so you can be assured that the data we provide is always accurate and reliable. Start free trial See developer portal. Secure ... Our Forex API provides live streaming tick data trading feed from multiple providers, giving an exact view of what is exactly happening in the foreign exchange market. Our proprietary system handles millions of prices per day, which is ultra low latent and gives our customers a non-skewed view of the forex markets. We have no conflict of interest as we do not trade the markets, we purely a ... Currency data feed, Exchange Rates api and Forex API. Real-Time Data Feed api Solutions for currencies and currency conversions. ... Contact us using the live chat or contact-us form. We will get back to you ASAP. Clients. We have many clients worldwide as of September 2020. With high retention rate, we are confident that our customers are happy with our service. Free 0 $ / Month. 500 API ... Forex Feed Data API . The ForexFeed Data API is an application programming interface (API) that can be embedded in or bundled with your applications. The Data API provides direct access to the ForexFeed Data Service by wrapping common data operations inside simple function/method calls. The Data API is available in a variety of different programming languages and can be used to offload common ... API trading allows you to connect custom trading software to a broker. In this comparison, we've compared some of the top brokers (like Plus500, eToro, XTB and more) that offer APIs for trading forex, stocks, CFDs, crypto and more.

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Algo Bridge Live Trading Demostration Web-based Algo Trading platform

Real time forex rates in Excel form True FX. Very fast and easy. Includes real time bid and offer quotes from selected brokers. Please check the newest video... Forex.Today: - Live Forex Trading - Friday 17 April 2020 Forex.Today 183 watching Live now Excel VBA - Get Stock Quotes from Yahoo Finance API - Duration: 21:49. Walk through video showing how to access the Live Briefs PRO Global Markets premium news feed with your IQFeed subscription. In addition to North American market coverage, MT Newswires has great ... QUICK TRADE PANEL FEATURES Of TradeBridge, Multiple Order Window (KITE,Uptsox,Aliceblue no API Feed - Duration: 19:42. Algo Baba Stock Trading Bridge 220 views 19:42 Live Forex Trading - EURUSD, AUDUSD, GBPUSD, NZDUSD, USDCAD, USDCHF, USDJPY UFX Trend Scalper 21 watching Live now The Money Flow Trading Society - Duration: 1:11:41. MCX Sure Gain is the leading financial service provider. We offer MT4 data feed, Auto buy sell signals, Auto Robot trading, Algo Trading and New Trading Account. All of Our services are Unique and ... ** Get the latest source code for FIX API Tutorials, troubleshoot your applications, give and get help from fellow algorithmic traders and more, over at the Darwinex Collective Slack Workspace ...

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