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Mastercard expanded its Agent Pay platform this week 1, releasing a developer toolkit with APIs for tokenised agent transaction authorisation and a dedicated sandbox environment for integration testing. The expansion adds structured request-response schemas for agent wallet operations and rate-limit controls for high-frequency agent purchase flows.
The toolkit targets the integration layer between language model runtimes and existing payment processors. Documentation covers authentication via scoped bearer tokens, transaction lifecycle events including authorisation, capture, and refund, and webhook schemas for asynchronous agent notification.
Mastercard first introduced Agent Pay in April 2025 2, positioning the product as infrastructure for AI systems to initiate card-network transactions on behalf of human principals. This week’s developer release extends that foundation with testable environments and public documentation where previously only preview access existed.
Three payment-network participants — Mastercard, Visa, and Stripe — each published agent commerce infrastructure in 2025. The Anthropic Model Context Protocol specification in November 2024 3 established tool-calling semantics that the Agent Pay APIs now implement at the network layer; the field has moved from protocol design to available API endpoints in under a year.
New Agent Toolkit, Insight Tokens, and Agent Sign-Up tools released; Stripe, Google, and Ant International's Antom join as implementation partners.
Mastercard Newsroom