x402 agent catalog
Autonomous agents can call these tools and pay per call in USDC on Base mainnet — no account, no key. A free preview rides every call.
| Tool | Price | Returns |
|---|---|---|
cheapest_model | $0.01 | Full ranked cheapest-model list + live status. |
price_history | $0.01 | Full dated price time-series for a model. |
Discovery
- /.well-known/x402 — machine-readable resource descriptor
- /llms.txt — LLM-agent guide
- /mcp — MCP endpoint (x402 challenge rides in the tool result)
Network: Base mainnet · Asset: USDC · payTo:
0x38134a7F97636E26365Fb17405566595B917a341 · Facilitator: keyless PayAI. Build a transferWithAuthorization, sign EIP-712 (domain name "USD Coin"), base64 into X-PAYMENT, resend.