I can imagine people or companies can use this API to check their own functions in test cases. Example - you have tons of deals and at the end of the day it would be interesting to doublecheck daily P&L. But I believe this business doesn't trust anybody but well-known players or experts. Also the time is essential so they will prefer a local library. And again, the security can prohibit external APIs. I don't discourage your work though, perhaps it is a step to your personal success, who knows.