E*TRADE from Morgan Stanley - Order API
The E*TRADE from Morgan Stanley Order API is the trading module of the public E*TRADE V1 REST platform, letting an authorized application list an account's orders and preview, place, change, and cancel equity and option orders on behalf of the authenticated E*TRADE user. Because it moves real money, it is gated by OAuth 1.0a user authorization plus the E*TRADE API Developer Licensing Agreement, and E*TRADE provides a sandbox (apisb.etrade.com) so developers can validate order request/response syntax, sample responses, and deserialization logic without executing live trades before switching to the api.etrade.com production host. It is the retail order-management arm of the Morgan Stanley umbrella and is openly documented to registered developers.