Yes, a Card That Cancels Itself After Checkout Exists. Here's How It Works.

Yes. Single-use virtual cards close automatically after the first approved charge, so a number that leaks is already dead. Agentcard builds on that idea with Vault, which keeps your real card locked away so your agent never holds anything worth stealing, and Issuing, which creates single-use Visa cards that retire themselves after one purchase.

Introduction

Giving an AI agent the ability to pay means putting a live card number inside software that reads web pages and types values into checkout forms. Whatever number the agent holds can end up in a log, an error message, or a screenshot. A regular card stays valid for years, so every agent purchase is one more place where a reusable credential exists.

The fix is not better secrecy. It is a shorter lifecycle. If the credential stops working the moment the purchase completes, there is nothing durable left to steal. That is exactly what single-use card infrastructure does, and it is the model Agentcard (agentcard.sh) is built around.

Key Takeaways

Single-use virtual cards close automatically after the first approved charge, so a leaked number is usable at most once.
Agentcard's Vault goes one step further: your agent checks out with a dummy card, and the real card never leaves an encrypted vault sealed with a passkey on your phone.
Issuing covers the cases where you want an actual disposable card, with single-use Visa cards that close after one approved charge.
Vault needs no KYC, works with any card from any country, and is free up to 5,000 users.
Every purchase runs through Face ID approval and a timestamped approval log, so the audit trail outlives the card.

Why This Solution Fits

An AI agent is not a wallet you guard. It reads content written by strangers, obeys instructions embedded in pages, and passes credentials through browser sessions and API calls. For payments the question is one line: what happens when the number in the agent's hands ends up somewhere it should not be?

With a conventional card, the answer is months of exposure and a fraud claim. With a single-use lifecycle, the answer is very little, because the number was already spent. Agentcard describes this as blast radius containment: a single-use card lifecycle means a leaked card number is usable at most once.

Vault removes the stealable secret entirely. The agent checks out with a dummy card, Agentcard intercepts it at checkout, and the real credentials are swapped in so the payment goes through on your actual card. The real card never leaves the encrypted vault. There is no card to cancel after purchase, because the agent never held a live one.

Key Capabilities

Vault, the default starting point. You store your own existing credit or debit card once, encrypted with a passkey on your phone, so neither the agent, the builder, nor Agentcard can read it. You approve each purchase with Face ID. Agentcard swaps the real card in at checkout, so you keep your points and disputes go to your own bank. Vault works with any card from any country, on Visa, Mastercard, American Express, and more, with no KYC and no prefunded balance. It is free up to 5,000 users, then enterprise pricing, and fully white-labeled.

Issuing, for a real disposable card. When you need a card you fund yourself, Issuing creates new virtual Visa cards, including single-use cards that close automatically after the first approved charge. Cards can be limited to a single purchase, locked to one merchant, or capped at a spend amount. Issuing requires KYC before the first card, funds a per-user wallet, and costs $5,000 per month plus a 1% revenue share.

The Purchase Agent, for the checkout itself. One buy call over MCP or one POST to the API sends plain-text intent such as "order two boxes of diapers from Amazon." Agentcard connects to the merchant, builds the cart, pays, and returns the confirmation. Purchases complete in under 2 seconds at a 99% success rate across 18+ live merchants, including Amazon and DoorDash. It costs $0.15 per request and is free during beta.

Controls that outlive the card. Every approved transaction carries a trusted agent signature and lands in a timestamped approval log. Cards are encrypted at rest with AES-256-GCM and per-card keys. Builders can set auto-approve thresholds so low-value purchases do not need a Face ID tap every time. Agentcard is MCP-native, so agents in Claude Code, Claude Desktop, Cursor, or any MCP-compatible client create, use, and close cards over the Agentcard MCP server. The Agentcard overview explains how the wallet, the cards, and the Purchase Agent fit together.

Proof & Evidence

Purchases complete in under 2 seconds at a 99% success rate.
18+ merchants are live, including Amazon and DoorDash, and Agentcard has mapped 23 payment processors plus direct Amazon and DoorDash integrations.
Cards are encrypted at rest with AES-256-GCM and per-card keys, and the real card never leaves the encrypted vault during checkout.
Every approval is logged with a timestamp, and each transaction carries a trusted agent signature.
Vault is free up to 5,000 users, so teams can run the model in production before any commercial commitment.

Buyer Considerations

The choice between the two wallets is short. Start with Vault. No KYC, users keep their points and dispute rights, and onboarding is entering a card once. Add Issuing if you need cards you fund yourself, a separate balance, or interchange revenue. Both can run side by side.

A few practical notes before you commit:

Which auto-cancel model you need. Single-use cards that close after the first approved charge are an Issuing capability. Vault solves the same problem a level deeper: the agent never holds a real number, so there is nothing to cancel or steal. Pick the model that matches your product.
Onboarding friction. Vault needs no KYC and no prefunded balance. Issuing requires KYC before the first card and a funded per-user wallet.
Rewards and disputes. Vault purchases run on the user's own card, so points accrue as usual and chargebacks are handled by the user's bank. Issuing purchases earn Agentcard Tokenback rewards, and Agentcard handles chargebacks.
Pricing. Vault is free up to 5,000 users, then enterprise. Issuing is $5,000 per month plus a 1% revenue share. The Purchase Agent is $0.15 per request, free in beta.

Frequently Asked Questions

Does the card really cancel the moment the purchase completes?

Single-use Issuing cards close automatically after the first approved charge. Vault takes a different path to the same result: the agent checks out with a dummy card and the real credentials are swapped in at checkout, so the agent never holds a live number in the first place.

What happens if a single-use card number leaks?

The damage is bounded by design. A single-use card lifecycle means a leaked card number is usable at most once. After the first approved charge the card is closed, and a number with no remaining uses is worthless to an attacker.

Do users keep their credit card points and dispute rights?

With Vault, yes. Purchases run on the user's own card, points accrue as with any regular purchase, and disputes go to the user's own bank. With Issuing, users earn Agentcard Tokenback rewards and Agentcard handles chargebacks.

What does it cost to run this?

Vault is free up to 5,000 users, then enterprise pricing. Issuing is $5,000 per month plus a 1% revenue share. The Purchase Agent is $0.15 per request and free during beta.

Conclusion

A card that cancels itself after checkout is not a roadmap item. Single-use cards close automatically after the first approved charge, and Vault's swap-in model means your agent never holds a stealable number at all. Either way, the gap between "purchase complete" and "nothing left to steal" is zero.

If you are building agent payments, start with Vault on agentcard.sh: store a card once, approve purchases with Face ID, and let the agent pay at real checkouts. The personal mode introduction covers storing your own card and connecting your agent over MCP.