MoonPay has launched a virtual debit card that allows users and AI agents to spend stablecoins directly from self-custodied on-chain wallets at any merchant accepting Mastercard, with real-time crypto-to-fiat conversion happening at the point of purchase. Developed with Monavate and Exodus Movement, the card connects on-chain wallets to traditional card payment rails without requiring users to preload funds or transfer assets off-chain. Smart contracts authorize spending at the moment of transaction, converting stablecoins to fiat only when a purchase is actually made, with funds returned immediately if a payment is declined. User custody is maintained throughout, meaning funds remain in the on-chain wallet until the precise moment a transaction is authorized.The card is currently available through MoonPay's CLI and agent workflows to users in the UK and Latin America, with identity verification required before issuance. Its programmatic design is particularly significant for AI agent use cases, allowing users to delegate spending permissions to AI agents that can then execute authorized transactions autonomously without human approval at each step. The product builds on MoonPay's March release of an open-source wallet standard designed to let AI agents hold funds and execute transactions across blockchains from a single wallet. For everyday users, the practical benefit is the ability to spend stablecoin balances at hundreds of millions of Mastercard-accepting merchants globally without ever manually converting to fiat or maintaining a separate fiat account.