Circle Publishes Official USDC Spec for Machine Payments Protocol, Enabling Crosschain Agent-to-Agent Commerce

Circle published a formal USDC method specification for the Machine Payments Protocol on Monday, standardizing how AI agents and automated services settle payments in USDC across EVM-compatible blockchains and Solana. The spec introduces the first crosschain MPP payment profile via Circle Gateway and adds USDCx on Stacks.

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