The lepton was the smallest coin of the Greek world, one hundredth of a drachma. The name survived until the euro replaced the drachma in 2002. An obol was a small silver coin worth one sixth of a drachma in classical Athens.

Arc is a layer-one blockchain from Circle where gas is paid in USDC and finality lands in under a second. Native stablecoin gas and sub-second settlement make payments smaller than a cent economical for the first time.

x402 revives the HTTP 402 Payment Required status code. A server answers a request with 402 and a price; the client pays and retries; the resource is returned on settlement. It turns any endpoint into a pay-per-request resource.

A nanopayment is a payment too small to have been worth making before fees: a fraction of a cent, per article, per call, per second. Circle Gateway batches many of them so each one clears gas-free.

When an AI agent answers a question it grounds the answer in sources it retrieved. Today those sources are read for free. An agent can hold a wallet and pay per call, which lets it settle a tiny fee to each source it actually used.

USDC is a fully reserved digital dollar issued by Circle. On Arc it is both the unit of account and the gas token, so a payment and its fee are denominated in the same dollar.

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