Trading API's with a mock account

Are any of you aware of any brokers that provide API's for trading (that I could hook up to my .net application) AS WELL AS provide a mock money account

I have searched aro开发者_运维知识库und on sites for this question but surprisingly havent gotten an answer to the latter part of the question. How can us developers even test our trading apps if well known brokers such as TD Ameritrade, IB dont provide fake money accounts

Thanks

In general trading vendors / brokers will never post API to the open world, especially for trading activity. This is usually a violation of some SEC law or some regulatory rulings that keep this this way.

If you really want to build an app on top of those services you would need to enter into a contractual aggreement with them.

Working for a company that trades I would not expose my API's to the general public either.

If by "IB" you mean "Interactive Brokers", then I am not certain of your statement. IB certainly does offer paper trading accounts. There are also a number of open access accounts such as edemo that can be used to test API functionality. You might also look into what is possible with the Quantopian system.