Helicone Proxy Integration (OpenAI Python) Proxy Integration (Anthropic) Custom Properties and User Tracking Caching Rate Limiting Retries and Fallbacks Async Logging (Node.js) Feedback and Scoring Key Concepts - Proxy mode : Change to route through Helicone — zero code changes otherwise - Async logging : Log after the fact for zero-latency overhead in production - Headers-based config : All features controlled via HTTP headers — no SDK lock-in - Cost tracking : Automatic token counting and cost calculation per request, user, and model - Custom properties : Tag requests with arbitrary key-val…