It would be great to be able to write my own trading tools, and maybe even modify existing ones.

Based on my research so far, I've only found one option. I want to make sure there aren't any other options out there I should be considering.

This question appears to be off-topic.

Mt4 Api Example | MQL Forum

The users who voted to close gave this specific reason: Instead, describe the problem and what has been done so far to solve it. I vote for IB Interactive Brokers. I've used them in the past as was quite happy.

Pinnacle Capital Markets trading also has an API pcmtrading. For access to historical data, I've found EODData to have reasonable prices for their data dumps. For side projects, I can't afford rather don't want to afford a huge subscription fee just for some data to tinker with. As of this posting it looks like TradeKing is working on an API.

Not sure what the future of it is though. I've been using parts of the marketcetera platform. This is not a direct broker API of course, but that helps you avoid vendor lock-in so that might be a good thing. And of course all the tools they use are open source. There are also other brokers with the OEC platform and all the bells and whistles a pro could ask for.

There are a few. I was looking into MBTrading for a friend. I didn't get too far, as my friend lost interest. Seemed relatively straigt forward with a C and VB. They had some docs and everything. IIRC, you can create a demo account for free. I don't remember all the details, but it let you connect to their test server and pull quotes and make fake trades and such to get your software fine tuned.

Ameritrade also offers an API, as long as you have an Ameritrade account: NET Client Library for TD Ameritrade Trading Platform:.

NET SDK , also available via NuGet. Only related with currency trading Forex , but many Forex brokers are offering MetaTrader which let you code in MQL. The main problem with it aside that it's limited to Forex is that you've to code in MQL which might not be your preferred language.

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Log In Sign Up. Join the Stack Overflow Community. Stack Overflow is a community of 7. Join them; it only takes a minute: What online brokers offer APIs?

Based on answers so far, here's a quick list NET Excel MB Trading. Ben McCann 8, 15 51 I just created an account. Is it their OAuth implementation that bugs you? I'm having a bit of trouble with that. Are there other reasons not to go with etrade? I'm not sure why this post was closed. I find it useful to know what APIs are out there. It's not as if you asked which ones were best but only what brokers offer an API. Anyhow, Iv'e been developing using Oanda's API.

This is a useful question and there are many helpful answers.

MB Trading

Zerodha offers REST-like APIs. You can build a fully functional trading application using the APIs offered by Zerodha. IB does seem to be the best option, and so far the only one with a wide range of language support. What's IB's price per trade?

I can't parse their marketing materials. There seems to be a HTTP API: David Cain 8, 10 44 Ben Berry 21 1. Don't know much about cost for an actual account or anything. Howler 1, 5 17 Taylor 1, 10 Just an FYI, TD Ameritrade at the time of me writing this requires an account with k or 30 trades per quarter to use their API.

However, support did say they were looking at relaxing this a bit. Jared any updates on this "relax"?

NuWin I never heard unfortunately so I'm not aware if anything happened or not. NET Client Library for TD Ameritrade Trading Platform: I know this is an old question, but it's what came up while I was searching. AsTeR 3, 5 37 Stack Overflow works best with JavaScript enabled. NET Excel MB Trading api stocks trading share improve this question. I'm curious why you're sick of etrade.

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