I just finished part of my summer project. I now have a “private” fund called TRPL at http://trpl.youtualfunds.com/.
Youtualfunds.com is an online social investing site and a sister site to Collective2. It lets you trade a system online and possibly earn revenue by allowing subscribers to “buy” your fund at their broker. Even if no-one does, it’s a great way to forward test a simple strategy. They do have a basic WebAPI entry interface. They do charge if you choose to take your Fund “public” (meaning others can subscribe to it).