Key Takeaways:
Keyrock’s May 2026 report found AI agents settled $73M across 176M transactions in just 12 months, with 98.6% in USDC.Coinbase and Stripe each span 5 of 6 payment stack layers, while incumbents deployed over $8B in acquisitions.MiCA, the GENIUS Act, and the EU AI Act all hit enforcement by August 2, 2026, with none covering machine-to-machine payments.Keyrock’s analysis shows these four protocols are not purely competing. They are assembling into a layered stack. AP2 handles authorization. x402 and MPP handle settlement beneath it. The question the report focuses on is which companies capture the most layers, and therefore attract the most value.
According to the report, Coinbase and Stripe each span five of six stack layers. Coinbase controls settlement through Base, wallets through its AgentKit platform, the payment protocol through x402, and governance as a partner in AP2. Stripe mirrors this through Tempo for settlement, Privy for wallets, Bridge for routing, and MPP for the protocol layer. Circle covers four layers. Google and Visa currently span two and one, respectively.
Regulatory uncertainty is the binding constraint identified across all sections. Three major frameworks reach enforcement within weeks of each other: MiCA’s transitional period ends July 1, 2026, the GENIUS Act’s implementation deadline falls July 18, and the EU AI Act’s high-risk obligations take effect August 2. None contain provisions for autonomous machine-to-machine transactions.
The report concludes that the machine economy already exists. It is not yet doing meaningful commerce. The infrastructure is ready. The regulatory clarity is not.
