Collective2 allows users to choose from a library of stock exchange trading systems, subscribe to those systems, and then automatically trade those systems in the user's brokerage account.
Collective2 offers a Signal Entry API with which users can place trades and send trading-related instructions. Developers can also write software which pulls trading information out of Collective2 with the Collective2 AutoTrading API (C2ATI). Both APIs use HTTP.
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