Anybody knows if one can find an inference provider that offers input token caching? It should be almost required for agentic use - first speed, but also almost

Anybody knows if one can find an inference provider that offers input token caching? It should be almost required for agentic use - first speed, but also almost all conversations start where the previous ended, so cost may end up quite higher with no caching. I would have expected good providers like Together, Fireworks, etc support it, but I can't find it, except if I run vllm myself on self-hosted instances.