x402 Payment Protocol

Watch a complete HTTP 402 payment flow settle on Arc in real time. Every step is verifiable on ArcScan.

Total settlements

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USDC distributed

402 challenges served

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x402 payments settled

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The demo runs the full x402 lifecycle: challenge → authorize → settle → verify.

Creator

Resource

Amount (atomic USDC) — $0.001000

Creator revenue: $0 USDC across 0 settlements · 0 unique supporters

Start a flow to see the settlement proof here.

No settlement yet

Click ▶ Start x402 flow on the left to run a complete 402 challenge → EIP-3009 sign → Arc settlement → ArcScan verification.

Typical demo time: 5–10 seconds.

Server returns HTTP 402 + PAYMENT-REQUIRED header with the amount, network, recipient, and EIP-3009 nonce.

AI agent (or human wallet) signs an EIP-712 transferWithAuthorization. Server receives PAYMENT-SIGNATURE header.

Facilitator submits the transferWithAuthorization on Arc (chain id 5042002). Sub-second BFT finality.

Server polls Blockscout v2 API to confirm the tx is mined + status=1. Returns PAYMENT-RESPONSE + proof.