Mastercard Opens Early Access for AI Agent Payments

Mastercard opened Early Access to Agent Pay for Machines on Oct. 20, allowing AI agents to pay for digital services within spending limits set by businesses. The company demonstrated the service at Cloudflare Connect. It builds on the x402 protocol, which allows a website or application to respond with an HTTP “402 Payment Required” message when payment is needed.

The release includes buyer and seller application programming interfaces, a developer toolkit, a sandbox and documentation. Mastercard reported completed pilots with Cloudflare, Ant International, AIsa, Base, BVNK, Coinbase and Hype.

The payment process begins when a business gives an AI agent a task and a spending limit. The agent finds a participating service and submits a payment plan for approval. When the service returns payment terms through an HTTP 402 response, the agent signs a voucher promising payment within the approved limit.

The seller verifies the voucher and provides the service without waiting for an on-chain transaction. Sellers can combine multiple vouchers and redeem them later through the payment system. Mastercard describes the process as “authorize once, transact many times, guarantee payment now, settle later.”

In the demonstration, marketing agency Hype gave an agent a budget to plan a protein bar campaign. The agent paid AIsa for social media research and bought eight campaign images through Cloudflare AI Gateway. The agent made nine payments to two merchants under one approved budget.

Coinbase Developer Platform funded the agent’s wallet, while Base provided on-chain settlement. BVNK used Mastercard’s Global Money Platform to settle payments in fiat or stablecoins. The platform allows sellers to receive their preferred currency, token or payment rail, according to Mastercard.

Cloudflare’s Monetization Gateway served as the seller-side system in the demonstration. Cloudflare has described the gateway as a system that verifies and settles x402 payments through Coinbase’s facilitator, with payments settling on Base in USDC. Mastercard has not identified the stablecoin used in its demonstration or confirmed whether the same settlement arrangements will apply in production.

Agent Pay for Machines keeps x402’s payment request but changes the settlement process. In a standard x402 transaction, an agent pays from its wallet for each request, while a facilitator verifies and settles the payment on-chain. Mastercard’s system replaces the immediate payment with a signed voucher and adds a trust layer intended to guarantee payment within the approved terms before redemption.

The service is designed for payments for artificial intelligence models, data, computing resources and application programming interfaces. These payments can be too small for traditional card transactions because fixed fees may exceed the amount being paid. Vouchers can group multiple payments before settlement.

Mastercard has not published buyer or seller fees, redemption schedules, supported settlement networks or stablecoins beyond the Base demonstration. The company has not announced voucher dispute procedures, chargeback rules, responsibility for unpaid vouchers, the countries covered by Early Access or a general availability date.

Mastercard introduced Agent Pay for Machines as a partner program on June 10 with more than 30 supporters, including Adyen, BVNK, Checkout.com, Cloudflare, Coinbase, Stripe and Tempo. The Early Access release allows developers to test the first version while Mastercard collects feedback from customers and partners.