x402 v2
Exact fixed-price payments with Base mainnet identified as eip155:8453.
HTTP is the checkout.
Call a protected route, receive 402 Payment Required, authorize USDC, retry, and receive the result with a settlement receipt.
USDC
Prices are denominated in dollars and settled using Base USDC.
Bazaar metadata
Input schemas and output examples are attached to 402 challenges for machine discovery.
Seller properties
- No buyer account database.
- No checkout page or invoice lifecycle.
- No private withdrawal key on the API server.
- Append-only settlement receipt ledger.
- SSRF-safe public network checks for URL, TLS, and DNS tools.