# USD Coin (USDC) Leads Tracked AI-Agent Payment Activity

By Simon Yoon

Canonical URL: https://www.tokenpost.com/news/technology/34486
Published: 2026-10-18T21:27:56.000Z
Updated: 2026-10-18T21:27:56.000Z
Section: Technology

> MiCA includes a value above €5 billion as one of at least three criteria for significant e-money-token status.

USD Coin (USDC) was the most-used stablecoin for AI-agent payments in a 30-day set of tracked on-chain activity across Base and other crypto networks, a limited measure of use rather than an overall market ranking.

Agents routed payments through Algorand, Solana, Polygon, Canton and other networks while paying in USDC. The tracked activity put USDC ahead of other stablecoins for those payments, but does not establish a lead across all AI-agent payments or protocols.

Tether (USDT) remained the wider stablecoin market’s leader by a wide margin. That broader ranking differs from USDC’s lead in the tracked agent-payment activity.

USDC’s circulating supply remained between $70 billion and $80 billion over the past 12 months. The European Union’s Markets in Crypto-Assets Regulation (MiCA) includes a value above €5 billion as one criterion for classifying an e-money token as significant. At least three criteria must be met, so the €5 billion figure is not a standalone supply limit or automatic classification test.