Helicone is an Open Source LLM Observability startup, part of YCombinator W23 cohort.

- They have a generous free-tier of 50K monthly logs. - They also are open-source with MIT License.

Helicone Setup is just two lines of code change to set them up as a proxy.
They support OpenAI, Anthropic, Anyscale, and a couple of OpenAI compatible endpoints.

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