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06/24 01:40

Circle wants USDC to be how AI agents pay each other

@circle has published an internet-draft, draft-usdc-charge-00, that defines a common protocol for AI agents, APIs, and services to settle payments in $USDC over the web. The spec is filed in the style of an IETF internet-draft, meaning it is a work-in-progress proposal, not a ratified standard. It is built on the HTTP "402 Payment Required" status code, a mechanism that gates access to online resources and has sat largely unused since the early days of the web.

Specifically, draft-usdc-charge-00 defines a $USDC payment method for the Machine Payments Protocol (MPP), an open standard co-authored by Stripe and Tempo and launched in March 2026. MPP and Coinbase's x402 are parallel, competing efforts that both revive the HTTP 402 status code for agent payments; they are distinct protocols. Circle's draft is an MPP method spec, not an extension of x402.

The flow is straightforward. When an agent requests a resource that requires payment, the server replies with a 402 response containing pricing and payment instructions. The agent reads those instructions, signs a $USDC transaction, attaches proof, and retries the request. The server verifies the payment and returns the data. The entire cycle is automated, requires no login or account, and settles on-chain.

Coverage in the spec is deliberately broad. It addresses $USDC on Ethereum-compatible chains and Solana, includes $USDC-backed tokens such as USDCx on Stacks, and supports cross-chain payments through Circle Gateway, allowing a payment to originate on one network and settle on another. Gateway's chain-abstracted design enables a unified $USDC balance, so agents can transact freely across chains without managing separate positions on each.

The Broader Infrastructure Play

The draft sits inside a larger push by @circle to build payment rails for the agentic economy. In May 2026, Circle launched Circle Agent Stack, which includes Circle CLI, Agent Wallets, Agent Marketplace, and Nanopayments powered by Circle Gateway. Together, these tools let developers and self-running AI agents hold assets, discover services, and transact programmatically with $USDC across supported blockchains.

Nanopayments enables gas-free $USDC transfers as small as $0.000001 at machine speed, designed for high-frequency, sub-cent flows. Rather than settling each transfer individually, Gateway batches thousands of transactions into a single on-chain commitment, keeping costs near zero. Circle is also working with Google on their Agent2Agent (A2A) and Agent Payments Protocol (AP2), using the Gateway integration to support both.

Scale Already Behind It

The liquidity base underpinning the spec is substantial. In Q1 2026, Circle reported $77.0 billion of $USDC in circulation at quarter end, up 28% year-on-year, alongside $21.5 trillion of on-chain transaction volume in the quarter, up 263%. That existing depth gives the agent payment standard a foundation that newer protocols will find difficult to match.

Sources:
paymentauth.org: draft-usdc-charge-00 USDC Charge Internet Draft
Circle: Introducing Circle Agent Stack
Circle: First Quarter 2026 Results
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