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The AmeriTrade API allows developers to enable their software to connect to TD AmeriTrade. Anyone with a TD Ameritrade account has access to the API, and you can use API features such as submitting a trade, canceling a trade, modifying a trade, viewing historical stock data, streaming news and actives, obtaining your account information, and getting mutual fund or EFT data. You can become a partner, too, to expand your application's reach. Contact to obtain more information and documentation.
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Here is a .NET SDK for this API: [url]http://tda.codeplex.com[/url]