Crossmint partners with American Express to launch ACE™ Developer Kit, aiming to power trusted AI commerce with secure card-based interactions and user control

Amex controls both sides of every transaction on their closed-loop network — issuer, acquirer, and network — giving them an intent verification loop that Visa and Mastercard can't replicate on open-loop rails without multi-party coordination. Crossmint already routes through stablecoins, x402, and traditional card rails side-by-side, so they're building the abstraction layer that wins regardless of which agentic payment standard takes hold. The aggressive move is Agent Purchase Protection: Amex underwriting AI agent purchase errors as competitive moat, betting that chargeback exposure from autonomous agents stays manageable before anyone has real loss data to price it.

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More coverage

• Agentic Commerce Experiences (ACE) Developer Kit (developer.americanexpress.com)
• Agentic Commerce Experiences | American Express (americanexpress.com)
• Building Trust in AI-Powered Transactions with Amex Agentic ... (americanexpress.io)
• American Express launches developer kit, purchase protection for ... (digitalcommerce360.com)
• Crossmint (x.com)

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