[blowski]

So I would make a request like:

    POST /transfer

    from_account_id=12345&to_account_id=67890&amount=10

Perhaps I've misunderstood your comment, as I don't really understand why this is better than the original:

    POST /accounts/12345/transfer

    to_account_id=67890&amount=10

or even:

    POST /accounts/12345/withdraw

    amount=10

[qyv]

Having the /account/:accountid/transfer is not a terrible idea, but I would avoid it because the transfer resource is able to stand on it's own with making it tied to a single account resource.

The key point though is that 'transfer' is the resource to perform all three of the original deposit/withdrawal/transfer actions.