Two kinds of buyer use this service: people who want a report about their website, and AI agents that call small utilities and pay per call. Neither needs an account.
Paid endpoints use x402, the HTTP 402 payment protocol. There are no API keys: the payment is the authorisation.
402 Payment Required with the price, network and receiving address.PAYMENT-SIGNATURE (x402 v2) or X-PAYMENT (v1) header.See it for yourself — this returns a real payment challenge, not an error:
curl -i -X POST https://agentic-endpoints.com/once-key -H 'Content-Type: application/json' -d '{"namespace":"demo-4f9c2b1e8d7a","action_key":"abc123"}'
POST /credits/trial returns $0.10 of credit — about 10 calls — with no wallet, signature or account.
Buy $6.00 of credit for $5, or $32.50 for $25, then send X-Credit-Token instead of signing every call.
Every route is described in /openapi.json and, in prose for models, /llms.txt.
Point any MCP client at https://agentic-endpoints.com/mcp. Listing tools is free; each call costs its route's price.
JSON-RPC at /a2a, with an Agent Card at /.well-known/agent-card.json.