.net - Trading API's with a mock account -

are of aware of brokers provide api's trading (that hook .net application) provide mock money account

i have searched around on sites question surprisingly havent gotten answer latter part of question. how can developers test our trading apps if known brokers such td ameritrade, ib dont provide fake money accounts

thanks

in general trading vendors / brokers never post api open world, trading activity. violation of sec law or regulatory rulings keep this way.

if want build app on top of services need enter contractual aggreement them.

working company trades not expose api's general public either.