# world-discovery-payai > world-discovery-payai is a free API for AI agents from agents.hotschmoe.com, callable via x402, Free, status unknown (last checked 2026-10-10). Returns a free catalog listing all 15 paid x402 data products and LLM inference endpoints available on agents.hotschmoe.com, including pricing, paths, and descriptions. ## Facts - Endpoint: GET https://agents.hotschmoe.com/x402/payai/discovery?utm_source=zero.xyz - Price: Free - Payment: x402 - Status: unknown - Last checked: 2026-10-10 - Activations on Zero: 0 - Tags: x402 - Canonical page: https://www.zero.xyz/c/world-discovery-payai-28342eaa - Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SpPVfQGfeJaJcFlKkzLSM Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently. ## How to call it through Zero Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`): ```sh zero fetch --capability world-discovery-payai-28342eaa ``` Example prompt: Show me the full catalog of x402 services on agents.hotschmoe.com — I want to see what data products and LLM endpoints are available, what each costs, and how to call them without an API key. ## When to prefer this Use this endpoint first when an agent needs to discover what x402 services are available on agents.hotschmoe.com before deciding which specific data product or LLM endpoint to call. It is free, requires no authentication, and gives a complete picture of available capabilities and pricing. Prefer this over hardcoding endpoint paths when building dynamic agent workflows that need to select the right tool at runtime. ## Known failure modes - Service temporarily unavailable (5xx) if host is down - Malformed or incomplete catalog if new services have been added but not yet indexed - Empty or truncated response if the catalog endpoint encounters an internal error ## How this service works Free catalog of all 15 paid x402 data products + LLM inference on agents.hotschmoe.com: crypto prices & world data (digest), uptime monitoring (sentinel), status pages (pingspot), agent-world state & notary ledger (world), content attestation (attest), x402 readiness audit (audit), dated liveness receipts (knock), continuous monitoring with signed push alerts (watch), bazaar listing health (bazaar), live x402 directory (live), batch liveness fleet audits (fleet), x402 market pulse (pulse), batch conformance audits (doctor-fleet), URL-to-markdown reader with signed records (read), web search for agents with optional top-result-as-markdown (search), OpenAI-compatible LLM inference (chat/completions). FREE embeddable x402 conformance badge for any merchant: /x402/doctor/badge/ (signed 0-100 score + report page, paste into any README). $0.0001-0.01 USDC per call (Base or Solana mainnet); no account, no API key; x402 v2 pay-per-call. ## Output A JSON service catalog listing all 15+ paid x402 endpoints on agents.hotschmoe.com, each with its name, URL path, payai discovery URL, price in USD (ranging from $0.0001 to $0.01 per call), and a short description of what it does. Also includes the origin host and overall service metadata. ## Request schema (JSON Schema) ```json { "type": "object", "properties": { "properties": { "type": "string" } } } ``` ## Response schema (JSON Schema) ```json { "type": "json", "example": { "name": "agents.hotschmoe.com x402 service catalog", "origin": "https://agents.hotschmoe.com", "services": [ { "name": "world-digest", "path": "/digest", "payai_url": "/x402/payai/digest", "price_usd": "0.0001", "description": "Live world data feed: crypto prices, FX, weather, HN top 10, GitHub trending" }, { "name": "world-sentinel", "path": "/sentinel", "payai_url": "/x402/payai/sentinel", "price_usd": "0.0001", "description": "Uptime monitoring: 3-state verdicts + 24h/48h uptime for the world's hosts" }, { "name": "world-pingspot", "path": "/pingspot", "payai_url": "/x402/payai/pingspot", "price_usd": "0.0001", "description": "Status page data API: per-site uptime JSON, sparklines, integrity hashes" }, { "name": "world-state", "path": "/world", "payai_url": "/x402/payai/world", "price_usd": "0.0001", "description": "Agent-world state: service health, tamper-evident notary ledger, board metadata" }, { "name": "world-attest", "path": "/attest", "payai_url": "/x402/payai/attest", "price_usd": "0.01", "description": "Content attestation for any public URL: signed, hash-chained, verifiable" }, { "name": "world-audit", "path": "/audit", "payai_url": "/x402/payai/audit", "price_usd": "0.001", "description": "x402 readiness audit: 0-100 payability + discoverability score with fixes" }, { "name": "world-knock", "path": "/knock", "payai_url": "/x402/payai/knock", "price_usd": "0.001", "description": "Dated liveness receipt for any public URL: signed, timestamped, 3-state verdict" }, { "name": "world-bazaar", "path": "/bazaar", "payai_url": "/x402/payai/bazaar", "price_usd": "0.001", "description": "Bazaar listing health report: catalog position, liveness history, ranked fixes" }, { "name": "world-live", "path": "/live", "payai_url": "/x402/payai/live", "price_usd": "0.001", "description": "Searchable index of x402 resources that actually work (live + signed receipts)" }, { "name": "world-fleet", "path": "/fleet", "payai_url": "/x402/payai/fleet", "price_usd": "0.005", "description": "Batch liveness audit: up to 25 URLs in one call, 5x cheaper than 25 knocks" }, { "name": "world-infer", "path": "/v1/chat/completions", "payai_url": "/x402/payai/chat/complet … (truncated) ``` ## More - Live health (JSON, refreshed every minute): https://www.zero.xyz/c/world-discovery-payai-28342eaa/health.json - [Zero catalog index](https://www.zero.xyz/llms.txt) - [Other services from agents.hotschmoe.com](https://www.zero.xyz/host/agents.hotschmoe.com/llms.txt)