Open-source observability platform for LLM applications that provides logging, monitoring, caching, and cost tracking for API calls to AI model providers.
Every solution here is available over the API and to AI agents over MCP.
Installs https://mcp.apievangelist.com/mcp in Claude, Cursor, VS Code and the rest — one button, every client.
find_solutionsBrowse the third-party solutions registry.get_solutionOne solution in full.search_api_evangelistSearch every content type across the network at once.find_relatedThe shared-tag relevance graph — what else covers this.get_tagEverything one tag labels, across all content types.guide_topicPRO — a curated bundle for a topic: area, guidance, rules, papers, stories, services.curl "https://api.apievangelist.com/v1/solutions/helicone"curl "https://api.apievangelist.com/v1/solutions/helicone?include=content" \
-H "x-api-key: $AE_KEY"curl "https://api.apievangelist.com/v1/solutions/helicone/related"curl "https://api.apievangelist.com/v1/solutions?limit=25"Discovery needs no key. Full bodies and the synthesis endpoints are Pro.
Free tier, no email required. Sign in with whichever identity you already have.
A second provider on the same verified email joins the account you already have. Your account