Circle Joins x402 Foundation to Standardize Internet-Native Payments

The x402 protocol is an open standard for internet-native payments, and Circle has joined the x402 Foundation as a founding member. The foundation, launched under the Linux Foundation's governance on April 2, 2026, aims to embed payments directly into web requests using the long-dormant HTTP status code 402.

The protocol allows clients to programmatically send payment in USDC and access resources without login or account creation. It charges zero fees at the protocol level, with users only paying the underlying blockchain network costs.

Circle has been actively contributing to the protocol's development since October 2025, focusing on cross-chain USDC settlements and micropayment batching. The x402 protocol's origin story starts with Coinbase, which publicly introduced the standard in May 2025.

The early traction numbers are notable, with the Solana Foundation facilitating approximately 65% of the protocol's early transaction volume. Traditional finance giants like Visa and Mastercard have also joined as founding members, suggesting they see machine-to-machine payments as a large enough category to justify collaboration rather than competition.