The api docs clearly mention being able to perform a fiat exchange, however there are no examples offered of actually doing so. Replacing the "currency from" field provided in their example with "fiat" or "USD" only wields a 404 error. It seems making a usd to crypto exchange requires some more involved changes to the POST request, but they failed to properly document it when they added that feature. I have even gone to the length of sending a GET request to /get_all_currencies; returning a list of all offered currencies. I had hopped they simply gave USD a weird name causing the aforementioned 404 error. Disappointingly I DID find that USD is correctly listed as USD. Here are the screen shots of my problem: The documentation : Swagger UI Screen Shot Screen Shot #2