x402 payments on Base (USDC)

vet402 measures x402 payments on Base.

The pinned settlement asset on Base is USDC.

1.This read

Delivered counts settled purchases whose paid request answered 2xx. The row is l1.byChain for Base. CAIP-2 eip155:8453.

Paid attempts

15,542

Settled

9,917

Delivered

9,204

461 settled purchases on this chain are held as inconclusive. The methodology says why a 4xx is held.

2.How a purchase is tied to its settlement

CAIP-2 eip155:8453. 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.