x402 payments on Arbitrum One (USDC)

vet402 measures x402 payments on Arbitrum One.

The pinned settlement asset on Arbitrum One is USDC.

1.This read

Delivered counts settled purchases whose paid request answered 2xx. The row is l1.byChain for Arbitrum One. CAIP-2 eip155:42161.

Paid attempts

107

Settled

58

Delivered

57

2.How a purchase is tied to its settlement

CAIP-2 eip155:42161. The purchase is tied to its settlement by the EIP-3009 authorization nonce. The re-read matches that nonce on the transfer.

3.Where to read on

/api/v1/observatory/state (CC BY 4.0) is the source. Definitions are in the methodology. How an agent pays, including USDC, is How AI agents pay with stablecoins. How to check a seller before paying is on its own page. A longer note on the protocol is What is x402.