USDC Dominates Agent-Initiated Stablecoin Transfers on x402 Protocol

A new update from Token Terminal has revealed that Circle's USDC dominates agent-initiated stablecoin transfers on the x402 protocol. The data shows that USDC accounts for virtually all such transfers, indicating its central role in emerging automated payment systems designed for artificial intelligence agents.

The x402 protocol is an open payment standard that enables automated, request-based payments over the internet. It revives the long-dormant HTTP 402 'Payment Required' status code, allowing servers to request payment before delivering resources such as API data or digital services. AI agents can respond by authorizing and completing a stablecoin transfer, typically without human intervention or traditional account setups.

The protocol supports settlement on several networks, including Base, Polygon, Solana, and Algorand. Transfers are often structured as micropayments, enabling agents to pay small amounts per request in a gas-efficient manner. Facilitators commonly handle on-chain submission, allowing agents to authorize payments through off-chain signatures.