What online brokers offer APIs

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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

Looks like E Trade has an API now    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

User · Answer

openecry com is a broker with plenty of information on an API and instructions on how to do yours  There are also other brokers with the OEC platform and all the bells and whistles a pro could ask for

User · Answer

NET Client Library for TD Ameritrade Trading Platform   TD Ameritrade  NET SDK  also available via NuGet

User · Answer

Ameritrade also offers an API  as long as you have an Ameritrade account  http   www tdameritrade com tradingtools partnertools api dev html

User · Answer

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 com  but I haven t used them   Interactive Brokers   https   www interactivebrokers com en  f  2Fen 2Fsoftware 2Fibapi php  Pinnacle Capital Markets   http   www pcmtrading com es technology api html

User · Answer

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

[api] What online brokers offer APIs?

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