ferrogate

Open-source AI gateway on Cloudflare Workers, in TypeScript: OpenAI/Anthropic-compatible chat with SSE streaming, Files + Batch APIs, provider routing with circuit breaking and failover, virtual API keys, per-tenant Durable Object storage, quotas/wallets/budgets, guardrails, response cache, MCP server, durable metering, contract-driven Admin API. Maintained by lianluo-esign on GitHub, where it has earned 21 stars from the community.

It's actively developed around ai, aigateway, reverse-proxy, and is a solid reference for anyone building with these tools.