x402 facilitators API - Circle Docs

Circle’s x402 facilitators let sellers accept USDC payments over the x402 protocol. Facilitator Service settles each payment onchain. Gateway Nanopayments batches settlement for gas-free nanopayments down to $0.000001.

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API keys

Authenticate your requests with an API key.

x402 facilitators documentation

Learn how Circle’s x402 facilitators work and compare them.

Endpoint categories

Facilitator Service

Verify signatures, settle payments onchain, and check payment status.

Gateway Nanopayments

Settle and verify batched x402 payments through Circle Gateway.