Every signed agent payment on Arc, read from the chain: every signed USDC settlement and Circle Gateway batch since launch, by facilitator and seller. Plain USDC transfers carry no marker of what they paid for, so they are not counted.
A facilitator is the address that submits the settlement. direct: the facilitator called transferWithAuthorization on USDC for many payers, the shape of x402 payments. circular: at least 10 payers, at least half of whom are also its payees (the same wallets on both sides). concentrated: one payer made at least half of its volume (over at least 10 payments). self: wallets paying themselves, or our own wallets paying each other (our tests). contract: another contract spent the authorization (payouts, bridges). Only direct counts in the direct totals. These are shapes on the chain, not judgements about who the wallets are.
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Arc has no settlement webhook, so sellers poll for receipts. For $0.10 we send a message to your https webhook for 30 days, one for each settlement to your address on Arc, whichever facilitator carried it, Circle Gateway batches included. A Discord or Slack webhook works as it is.
AuthorizationUsed event from Arc USDC (0x3600…) since block 21,000,000, joined to the value it moved in the same transaction. Arc logs that value two ways: as a 6-decimal ERC-20 Transfer from 0x3600… on recent blocks, and as its native 18-decimal Transfer log on older ones. We read both.0x7777…00ee). The chain shows each batch's net balance changes, never the single payments inside it, so Gateway is counted in batches and dollars./supported signer list, or a published report). Every other one is shown by address./api/arc/x402 (free in a browser); every facilitator, seller and payer with the latest 1,000 settlements is /api/x402/arc-x402 ($0.004 over x402).