Mastercard has launched Mastercard AP4M, or Agent Pay for Machines, as a live payment protocol for AI agents. The system went live on June 10, 2026, allowing AI agents to authorize, coordinate, and settle payments without waiting for a human to approve each transaction. According to the source material, more than 30 partners joined on day one, including OKX, Coinbase, Stripe, Ant International, and Cloudflare. Mastercard described it as a live deployment rather than a pilot, with trading already active and credentials stored on-chain.
A payment system built for machine-to-machine commerce
AP4M is designed for machine-to-machine transactions, a category where traditional checkout flows are too slow and too dependent on human action. Instead of waiting for someone to click confirm, AI agents can purchase services from other AI agents, settle the transaction automatically, and continue operating. The source says this can happen continuously, at very small transaction values and at speeds that standard human-led checkout systems cannot match.
The protocol relies on three core components. First, Verifiable Intent credentialing requires each AI agent to prove it is authorized to spend before a transaction can proceed. Those credentials are initially stored on the public blockchains Polygon, Solana, and Base. Second, programmable spending limits let users and businesses impose fixed caps by session, by day, or by transaction type, with the system enforcing those limits automatically. Third, AP4M supports multi-rail settlement across bank cards, bank accounts, and stablecoins, which means an AI agent can pay using USDC or through traditional card rails inside the same protocol.
31 launch partners span crypto, payments, and AI infrastructure
The day-one partner list includes 31 organizations across payments infrastructure, blockchain, and AI. Named participants include Aave Labs, Adyen, Alchemy, Anchorage Digital, Ant International, BVNK, Checkout.com, Cloudflare, Coinbase, MoonPay, OKX, Polygon, Ripple, Solana Foundation, and Stripe. Mastercard Chief Product Officer Jorn Lambert said Agent Pay for Machines will create the conditions for high-volume, low-value, low-latency AI commerce.
OKX joined through its Agentic Wallet and Agent Payments Protocol, linking its exchange infrastructure to Mastercard’s settlement rails. Coinbase holds a different position in the rollout because Base, the chain it backs, is one of the three networks used for credential storage. Anchorage Digital co-founder and CEO Nathan McCauley said the initiative combines Mastercard’s global network reach with the flexibility of multi-rail settlement, including digital assets. Stripe’s involvement also matters because it shows AP4M is not limited to crypto-native use cases and is being built to work across conventional commerce and digital asset platforms at the same time.
Stablecoins and public chains are part of the core design
The source links AP4M to the emerging HTTP 402 standard, which has been cited as evidence that automated internet billing is already starting to appear. The missing piece, according to Mastercard’s team, has been reliable payment infrastructure that can complete those transactions. AP4M is intended to close that gap. The article also cites public analyst views that stablecoin support could give institutional users a clearer entry point into machine payments, while Polygon, Solana, and Base gain a practical use case beyond trading activity by serving as credential infrastructure for AI agents.
Based on the source, broader access to additional blockchains is planned for later in 2026. What is already clear is that AP4M has launched as a live protocol, with payment firms, exchanges, blockchain networks, and cloud infrastructure providers entering the system from day one.