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Blockchains

  • Arc
  • Base
  • Polygon PoS

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Identifiers and contracts

Use the CAIP-2 value as the network field and the USDC contract as the asset field in your x402 paymentRequirements.

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Mainnet

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Testnet

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Confirmation thresholds

Facilitator Service reports /settle and /status as completed only after the threshold for the target blockchain is met. On Base, a verified reorg after completion moves the payment to failed with reason=reorged. Facilitator Service never resubmits a reorged payment automatically.