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Circle published an official USDC method spec for the Machine Payments Protocol…

2026-06-23 · 19:00 UTC ·@circle ·0 min read

Brief

Circle released an official USDC method specification for the Machine Payments Protocol (MPP) on 2026-06-23, providing a standardized approach for agents to transact USDC across supported EVM chains and Solana. It introduces MPP's first crosschain payment profile through the Circle Gateway and adds support for USDC-backed stablecoins starting with USDCx on Stacks, aiming to enable blockchains as settlement layers for machine-to-machine commerce.

Why it matters

Circle published an official USDC method spec for the Machine Payments Protocol (MPP) on 2026-06-23, hosted at paymentauth.org/draft-usdc-c…

Key details

  • The spec standardizes agent-to-agent USDC transactions across supported EVM chains and Solana and introduces MPP's first crosschain payment profile via the Circle Gateway
  • The spec adds support for USDC-backed stablecoins, beginning with USDCx on Stacks, enabling blockchains to act as settlement layers for machine-to-machine commerce
Source evidence

We've published an official @USDC method spec for @mpp (Machine Payments Protocol)

The spec gives developers:

→ A standardized way for agents to transact in USDC across supported EVM chains and Solana
→ The first crosschain payment profile in MPP via Circle Gateway
→ Support for USDC-backed stablecoins, starting with USDCx on Stacks

For blockchain networks, this creates a path to become a settlement layer for machine-to-machine commerce, enabling seamless USDC payments between agents, APIs, services, and merchants across chains.

paymentauth.org/draft-usdc-c…