{"id":"96565f19-1743-48e7-b0ac-73be8840fb3a","shortId":"uKedJs","kind":"x402","title":"Semantic documentation search across 10 pre-indexed platforms for AI agents via x402 micropayments.","tagline":"Semantic documentation search across 10 pre-indexed platforms for AI agents via x402 micropayments.","description":"AgentUtil Docs provides instant, semantic documentation search for AI agents. It pre-indexes documentation from 10 platforms — Shopify, Stripe, Cloudflare Workers, Next.js, Anthropic, OpenAI, Tailwind CSS, htmx, x402, and Jesse — totaling roughly 38,000 chunks. Instead of keyword matching or per-page scraping, agents send a natural language query along with a platform identifier and receive the most relevant documentation chunks back, each with source URLs, page titles, section headings, and relevance scores. Queries resolve in under 100ms thanks to edge-based embedding and offline indexing.\n\nThe service exposes two paid endpoints and several free ones. POST /query performs semantic search ($0.003 per request via x402/USDC on Base), returning up to 10 ranked chunks per call. POST /lookup retrieves all chunks for a specific documentation page by identifier ($0.002 per request). Free endpoints include GET /platforms (lists all indexed platforms with page counts), GET /platforms/:id/schema (full table of contents), and POST /request (signal demand for new platforms to be indexed). A free tier of 10 queries per day per IP is available with no signup required.\n\nThe API follows a straightforward JSON request/response pattern. The OpenAPI 3.1.0 spec is published at /openapi.json, and agent discovery metadata is available via .well-known/agent-service.json and .well-known/agent.json. Payment is handled through the x402 protocol using USDC on the Base chain.","tags":[],"capabilities":["semantic-search","documentation-retrieval","natural-language-query","vector-search","multi-platform-docs","edge-inference","x402-micropayment","usdc-on-base","openapi-spec","agent-discovery"],"categories":["search","knowledge","developer-tools"],"synonyms":["documentation search API","semantic doc search","AI agent docs lookup","developer documentation API","vector documentation search","code docs search","platform docs query","AgentUtil"],"warnings":["x402 probe did not return a 402 challenge — endpoint returned 400 on POST, possibly due to missing required body fields; x402 payment flow not directly verified","Only 10 platforms are indexed; coverage is fixed and cannot be expanded on demand","No actual 200 response was captured during probing to confirm live data returns"],"endpointUrl":"https://docs.agentutil.net/query","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","openapi":"https://docs.agentutil.net/openapi.json","version":"2","docs_url":"https://docs.agentutil.net/.well-known/agent-service.json","free_tier":"10 queries/day without payment","description":"Semantic search across a platform's documentation. Returns relevant chunks with source URLs."},"payTo":"0x1357bef96ec515d250137d7eb712f0395eb5142d","amount":"3000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300}]},"qualityScore":"0.720","qualityRationale":"Full OpenAPI 3.1.0 schema with request/response definitions, clear pricing, agent discovery metadata, and a working landing page. The x402 probe returned 400 rather than 402 (likely because the free tier served the request or the POST body was empty/malformed), so the x402 payment challenge was not directly captured. Documentation beyond the landing page is sparse (all sub-paths return 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