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x402.cron2systemd 402 payments

Flagship

Inspect 402 All tools

Parse

Inspect 402 Header decode payTo extract Network id Accepts array Facilitator Timeout MIME match x402 vs plain exact scheme Pretty headers

Price

Atomic amount Price table USDC payTo Compare prices Network mismatch

Probe

Endpoint probe 200 vs 402 llms.txt

Checklist

Client checklist

Headers

WWW-Authenticate Settle header X-PAYMENT x402 version Header inventory Encode header Decode base64 Challenge style CORS expose Error text

Build

Build requirement Build accepts Build 402 Validate fields v1 shape v2 shape Duplicate accepts Scheme allowlist Resource match outputSchema

Amount

Human to atomic Batch atomic Amount aliases Amount scale Zero amount Price for N calls Amount delta Fee buffer Decimals from asset USDC ladder

EIP-3009

Typed data Digest preview Nonce check Validity window Domain name Value vs amount Recipient vs payTo Auth checklist

Network

Chain id USDC reverse EIP-55 checksum payTo kind CAIP-2 parse Normalize network Several networks

Facilitator

Verify response Settle response Payment payload Transaction id invalidReason

All tools / EIP-3009

EIP-3009 nonce check

Check that a nonce is 32 bytes of hex.

Nonce

Result

bytes32

EIP-3009 nonces are bytes32. A short hex string or a missing 0x prefix fails.

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