Gateway Nanopayments Primer
Circle Developer Notes / 0.002400 USDCreceipt evidence
0xa80fad10...3e3055
paid to creator0.002400USDC
forum routed
Circle Developer Notes
This receipt binds a source payment to the answer that used it. The previous hash links it into the append-only attribution ledger.
receipt hash0xa80fad10d330e9289f509ae7e4b1e87a0500be3abef72668bbc914dd583e3055
previous hash0xda8071657e6051f7e35df0c30bc0aeeadedbf385edbff886e65020418dbd72c5
query id0xfeb47c8f5f6ed07d
source idcircle-gateway-nano
creator wallet0x2222...2222
created at2026-06-23T14:52:16.779Z
payment resourceforum-fee-router:0xeff9bc359e8f2a5eabce55af3f1bb24f98eabf59
query payment hashnot reader-paid
payer0x4164F5B52ecc6F847f03071A287b0B59954cbcEe
transaction0xc5e1ca5a...22f4ef
FeeRouter split16
FeeRouter createSplit0xff2d3765...6a0b01
FeeRouter pay0xc5e1ca5a...22f4ef
answer context
How does an x402 float let agents settle USDC payments on Arc?
An x402 float on Arc enables agents to settle USDC payments for x402 services before their own wallet is funded. Shadow Float provides autonomous agents with behavior-backed USDC spending lines on Arc, allowing them to purchase x402 services immediately while managing debt, repayment, and spend overreach through receipts. This is paired with Arc's stablecoin-native settlement infrastructure, which uses USDC for gas and achieves sub-second finality, and Circle Gateway's batching of EIP-3009 authorizations to clear x402 payments at sub-cent values without per-payment gas costs.
Open answer evidenceExplains the technical mechanism (EIP-3009 batching) that makes x402 sub-cent payments economically viable without per-payment gas on USDC.