What online brokers offer APIs? [closed]

Question

So I'm getting really sick of E*TRADE and, being a developer, would love to find an online broker that offers an API. 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. Interactive Brokers offers a multi-language API (Java/C++/ActiveX/DDE) and has some fairly decent commission rates to boot. I want to make sure there aren't any other options out there I should be considering. Any ideas?

Update: Based on answers so far, here's a quick list...

• Interactive Brokers
  • Java
  • C++
  • ActiveX
  • DDE for Excel
• Pinnacle Trading
  • C++
  • Perl
  • VB.NET
  • Excel
• MB Trading

Answer 1

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.

Answer 2

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.Net SDK. They had some docs and everything. This was ~6 months ago, so it may be better (or worse) by now.

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.

Don't know much about cost for an actual account or anything.

Answer 3

Ameritrade also offers an API, as long as you have an Ameritrade account: http://www.tdameritrade.com/tradingtools/partnertools/api_dev.html

Answer 4

I've been using parts of the marketcetera platform. They support all kinds of marketdata sources and brokers and you should easily be able to add more brokers and/or data providers. 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.

Answer 5

LMAX have .NET and Java API, as well as their native XML/JSON protocol

Answer 6

As of this posting it looks like TradeKing is working on an API. Not sure what the future of it is though.