Skip to main content

Documentation Index

Fetch the complete documentation index at: https://docs.crossmint.com/llms.txt

Use this file to discover all available pages before exploring further.

Enable agents to pay with cards or stablecoins, all under spending rules defined and controlled by your users. Integrate via a white-label SDK that plugs into your agent framework as a tool or skill without handling sensitive credentials and while being PCI-compliant.

​
Crossmint takes care of

  • PCI-compliant card vaulting and tokenization
  • Visa VIC and Mastercard Agent Pay integrations
  • Non-custodial wallet infrastructure and onramps
  • Spending rule enforcement and user authorization flows
  • Direct API checkout via Fast Checkout

​
Payment methods

How users fund agent payments, with controlled access to spending sources.

Card permissions for agents

Users verify their card once, then give agents scoped permissions to use it with spending rules. Payments are secured via Visa VIC, Mastercard Agent Pay, and more.

Stablecoin wallets

Non-custodial, user-controlled wallets that grant agents scoped spending access.

​
Payment Flows

How agents execute payments across checkouts, APIs, and machine-to-machine paths.

Browser Checkouts

Make your agent drive a browser and complete the checkout form using a secure card number. Works anywhere cards are accepted.

x402

HTTP-native micropayments where agents pay in stablecoins on a per-use basis.

Fast Checkout

A single API call for checkout at supported merchants in the US (Amazon and Shopify stores). No browser needed.

MPP

A protocol for agent-to-agent and service-to-service payments. Best for programmatic machine economies.

​
Payment Methods × Payment Flows

Each payment method works with a specific set of flows. The matrix below shows what’s supported today.
Matrix showing which payment flows (x402, MPP, Fast Checkout, Browser Checkout, Send Stablecoins) are supported by cards and stablecoin wallets

​
Pick your path

Use this table to choose the right integration:
If your agent needs to…UsePay via
Buy from any website with a checkoutCardBrowser Checkout
Pay per API call or to another agent (micropayments)Stablecoinx402 or MPP
Buy from Amazon, any Shopify store, and other supported US merchantsCard or stablecoinFast Checkout

​
Get started

How agents pay

The full mental model, payment methods, spending rules, and destinations.

Cards quickstart

Get an agent paying with card permissions.

Wallets quickstart

Get an agent paying with stablecoins.