Mastercard opens its AI-agent payment system to developers after a demo that settled on Base via x402

Summary

Mastercard has opened early access to Agent Pay for Machines, its system for letting AI agents pay for online services within spending limits a business sets, releasing buyer- and seller-side APIs, a developer toolkit and a sandbox, according to The Block and Decrypt.

At Cloudflare’s Connect conference, Mastercard showed an agent for marketing agency Hype preparing a protein-bar campaign within an approved budget, making nine payments to two providers: AIsa for social media research and Cloudflare AI Gateway for eight campaign images, The Block reported.

The agent paid with the Coinbase-incubated x402 protocol: when a service answers with an HTTP 402 “Payment Required” response, the agent sends a signed payment voucher within its limit, which the provider verifies before delivering, and vouchers can be batched and redeemed later rather than settled one by one.

Coinbase Developer Platform supplied the agent’s wallet, Base was the onchain settlement network and BVNK, which Mastercard acquired in August, handled payment and settlement in fiat or stablecoins through Mastercard’s Global Money Platform; The Block said the product remains a pilot and is not yet commercially available.

The outlets list the pilot partners differently: The Block named Cloudflare, Ant International, BVNK, AIsa, Base and Coinbase, while Decrypt named Cloudflare, Ant International, AWS, BVNK and Coinbase.

Key facts

• Mastercard first announced Agent Pay for Machines in June, including support for spending controls and card, bank account and stablecoin payments, The Block said. (The Block)
• Mastercard is asking developers to test the APIs and say what they want added, according to The Block. (The Block)
• “The web gave software a way to communicate. APIs gave software a way to use services. Now AI agents need a way to pay for them,” Mastercard said in a statement shared with The Block. (The Block)
• Decrypt said Mastercard’s Jorn Lambert demonstrated the live transaction at Cloudflare Connect, and that the voucher exchanges happen off-chain at machine speed. (Decrypt)
• Sellers can receive payment in their preferred currency, token or rail, The Block reported. (The Block)
• Decrypt said the launch follows Mastercard’s recent Stablecoin Security risk tool and its BVNK-powered Global Money Platform. (Decrypt)