I couldn’t see how it wouldn’t be, as it’s a free market opt-in decision to use Butter

it wouldn't be the first API service to disallow someone from selling a cache layer for their API. After all, this should likely result in OpenAI (or whatever provider) making less money

Ah yes that makes sense, have heard of those cases too but hadn’t put much thought into it. Thanks for pointing it out!

I've seen the OpenRouter guys here on HN before, so you can probably ask them what to look out for.