98.6% of AI Agent payments are settled via USDC, a figure that more directly than any narrative illustrates: the crypto track is becoming the default payment layer for the machine economy.

Keyrock reports that over the past year, AI Agents have completed more than 176 million transactions on the blockchain, with settlement amounts exceeding $73 million. Traditional bank card systems struggle to handle high-frequency, micro-payments—76% of Agent payment amounts are below 30 cents.
Coinbase's x402 protocol, Stripe, Google, and Visa have all laid out infrastructure for machine-to-machine payments.
But on the other side of the coin: the industry's reliance on Circle is increasing risk. If the USDC issuer encounters compliance or technical issues, the entire AI Agent payment ecosystem could face systemic shocks.
This is not just a competition among stablecoins, but a test of the decentralization level of the infrastructure.
The adoption of crypto payment tracks has moved from "proof of concept" to "scaling deployment," but the risk structure is also becoming increasingly centralized.
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