u/Elegant_Paramedic678

Ok, so I have multiple school teachers in my family, so I have an exposure to what problems they face (in teaching, obviously, idc about admin stuff). So I thought of building an AI worksheet generator (idea under development).
Claude helped me build a beautiful backend, and through it, I discovered that I can actually integrate AIs without having to build my own through APIs (I'm new to this field). It added the Claude API, but I'm on a budget limit.
Any suggestions for completely free AI APIs? (and how to integrate them too)