Gateway Nanopayments Primer
Circle Developer Notes / 0.002400 USDCreceipt evidence
0x8f1da28f...15e0d7
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 hash0x8f1da28fd24fcaddf63c2993af8188221bd0e5eedfe9c94c455d36de9d15e0d7
previous hash0xddf24946f522c6cdfa1957656fa0d7b8cf262dbb820536ff48caa6f64ef7ad98
query id0xdb84a8bde95a682e
source idcircle-gateway-nano
creator wallet0x2222...2222
created at2026-06-24T17:15:32.330Z
payment resourceforum-fee-router:0xeff9bc359e8f2a5eabce55af3f1bb24f98eabf59
query payment hashnot reader-paid
payer0x4164F5B52ecc6F847f03071A287b0B59954cbcEe
Arc tx0xa2df24fe...429c0b
FeeRouter split115
FeeRouter createSplit0xe6780302...7fd742
FeeRouter pay0xa2df24fe...429c0b
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 you verify on-chain that AI citation payments were made correctly?
On-chain verification of AI citation payments uses three complementary mechanisms: (1) **Circle Gateway x402 Settlement** batches signed EIP-3009 authorizations so USDC nanopayments clear without per-payment gas, creating atomic on-chain records. (2) **Arc Testnet RPC Direct Audit** reads live wallet balances, transaction counts, and USDC flows directly from chain state—CitePay's on-chain audit page demonstrates this with zero-database verification. (3) **Receipt Hashing & Content Integrity Proof** — every citation payment generates a SHA-256 evidence hash tied to the source content, answer context, and creator wallet, making the payment cryptographically bound to the work reused. These receipts are shareable and accumulate in multi-turn sessions, creating an auditable trail. The combination of atomic settlement on Arc, direct RPC verification, and content-addressed receipt hashes ensures payments are verifiable without trusting any intermediary database.
Open answer evidenceTechnical foundation: explains how Circle Gateway batches signed EIP-3009 authorizations for x402 payments at sub-cent values, creating the atomic on-chain settlement layer that makes verification possible.No paid excerpt recorded.