Gateway Nanopayments Primer
Circle Developer Notes / 0.002400 USDCreceipt evidence
0x0c40ca1a...407426
creator amount0.002400USDC
accrued -> claimable on-chain
Circle Developer Notes
This receipt binds a source payment to the answer that used it; FeeRouter-routed receipts accrue into creator-claimable balances. The previous hash links it into the append-only attribution ledger.
payment statusaccrued -> claimable on-chain
settlement modeforum-routed
amount0.002400 USDC
receipt hash0x0c40ca1a981a24e0fed6d1400cd7eee27f6021e417bd20850cb3ba069c407426
previous hash0xf15a1ae5b3419c7b55eb5e4a89875b4c9094cf8663cde8a6b92557eb5f162bb8
query id0x215fd803199291d2
source idcircle-gateway-nano
creator wallet0x2222...2222
created at2026-06-24T14:40:41.819Z
payment resourceforum-fee-router:0xeff9bc359e8f2a5eabce55af3f1bb24f98eabf59
query payment hashnot reader-paid
payer0x4164F5B52ecc6F847f03071A287b0B59954cbcEe
Arc tx0x10116ef6...c30fea
FeeRouter split42
FeeRouter createSplit0xb69629cc...55d600
FeeRouter pay0x10116ef6...c30fea
contributorssingle recipient
canonical URLhttps://developers.circle.com/gateway/nanopayments
content fetched atnot recorded
source content hashnot recorded
source excerpt hashnot recorded
ownership proofnot verified
ownership signernot verified
answer context
How do AI agents pay creators per citation using USDC on Arc Testnet?
AI agents pay creators per citation using USDC on Arc Testnet through Circle Gateway's x402 protocol. The CitePay Markets platform enables this workflow: agents call the CitePay MCP Server (a Claude-native tool) with cite_query requests. Each citation triggers a nanopayment in USDC via Circle Gateway's batched EIP-3009 authorizations, which clear sub-cent values without per-payment gas costs. Payments settle on Arc Testnet with sub-second finality. Every payment generates an on-chain receipt with SHA-256 evidence hash and content integrity proof, visible directly on Arc's RPC. Agents can operate under spend policies (max price per citation, relevance thresholds, session caps) enforced via mandates. The CitePay On-Chain Audit page provides real-time verification of all USDC flows to creators—no database, pure chain verification.
Open answer evidenceEssential technical detail: explains how Circle Gateway batches EIP-3009 authorizations to enable sub-cent x402 payments without gas overhead—the infrastructure layer enabling per-citation payments.No paid excerpt recorded.