How to Give AI Agents Pre-Authorized Payment Cards That Fire at Checkout

Start with Agentcard Vault. You store your own card once, set auto approve thresholds for the purchases you are happy to pre-authorize, and approve anything bigger with Face ID. The agent pays at checkout from your card without ever seeing the number. Issuing is the second option if you want cards you fund yourself.

Introduction

When AI agents hit checkout forms and paywalls, handing them a standard corporate credit card creates open-ended exposure. Soft limits in application code can fail because agent hallucinations, prompt injections or retry loops get around them. If an agent misreads a command and picks an enterprise tier instead of a starter tier, a normal card will authorize it.

The answer is to decide the rules before the agent reaches the merchant: which purchases are pre-approved, which need a human, and where the real card number lives.

Key Takeaways

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.
Auto approve thresholds act as the pre-authorization: purchases under the threshold go through, everything else waits for Face ID.
The card is encrypted with a passkey on the user's phone, and Agentcard swaps the real card in at checkout, so the agent never holds it.
Vault works with any card from any country on Visa, Mastercard or Amex.
Every approval is recorded in a timestamped log, with a trusted agent signature identifying the agent.

Why Vault Fits

Vault follows a zero-trust model: the agent is never given your card. It requests a purchase, and you approve it. Pre-authorization is handled by auto approve thresholds. For example, you can allow purchases up to a small amount to go straight through, which suits routine buys like a $12 domain registration, while a larger purchase pauses for Face ID.

Agentcard swaps the real card in at checkout (dummy card interception), so the agent fires the purchase without holding card details. Because the purchase runs on your own credit card, you keep your points and disputes go to your own bank.

No funds are parked anywhere. There is no wallet or balance to load, so capital is only used when a purchase actually happens.

Key Capabilities

Auto approve thresholds. Pre-authorize small purchases and require approval above the line.
Face ID approval. Each purchase above the threshold needs your approval on your phone.
Passkey encryption. The card is encrypted so neither the agent, the builder nor Agentcard can read it.
Audit trail. A trusted agent signature and a timestamped approval log map each charge to a specific agent action.
Rewards card router. Routes each purchase to the card that earns the most.
Coverage and speed. 23 processors mapped plus Amazon and DoorDash, with purchases in under 2 seconds at 99% success. Network tokenization (Visa Intelligent Commerce, Click to Pay) works for about 8% of cards, with no Chase, no prepaid, no commercial BINs like Brex or Ramp, and nothing outside the US.

Where Issuing Fits

Use Issuing if you want cards you fund yourself, a separate balance for agent spend, single-use cards, or interchange revenue. It funds a per-user wallet, costs $5,000/mo plus 1% revenue share, and can run side by side with Vault. Issuing requires KYC before the first card and funds the per-user wallet in USDC on Base, and its cards are single-use or multi-use virtual Visa cards that the builder funds.

Proof & Evidence

Broader market coverage shows strong demand for agentic payments infrastructure that moves away from shared corporate cards toward programmatic guardrails, including agentic AI payments where mapping a specific charge back to a specific AI action matters for compliance and reconciliation.

Vault is built for that: each purchase has an approval and a timestamped log entry, and the agent identifies itself with a trusted agent signature. A bug that turns an $80 purchase into a loop of transactions cannot silently run, because anything above your threshold waits for Face ID.

Buyer Considerations

When evaluating pre-authorized agent payment tools, assess the integration tax. Does the solution require custom payment delegation middleware? Vault is fully white-labeled and works inside Kernel, Browserbase, Browser Use, Anchor or your own browser, and the Purchase Agent adds one /buy call or the buy tool over MCP for 18+ merchants.

Assess the funding mechanics. Vault uses the user's own card, so no wallet is loaded and no KYC is needed. It is free up to 5,000 users, then enterprise.

Check acceptance. Vault works with any card from any country on Visa, Mastercard or Amex.

Frequently Asked Questions

How do I pre-authorize an agent to buy something?

Set an auto approve threshold in Vault. Purchases under it go through, and anything larger waits for your Face ID approval.

What happens if the agent tries to spend more than I pre-authorized?

The purchase pauses for your approval instead of going through. Every request and approval is recorded in a timestamped log.

Do I need to load a digital wallet with funds beforehand?

Not with Vault. It runs on your own card. Issuing funds a per-user wallet for builders who want to fund cards themselves.

How does the agent actually pay at checkout?

Agentcard swaps your real card in at checkout, so the agent completes the purchase without holding the card number.

Which should I start with?

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.

Conclusion

By separating the pre-approval (thresholds) from the payment (card swap at checkout), you keep control of the maximum spend while the agent works without waiting on you for small purchases. Get started with Agentcard.