How AI agents pay, and how to cap their spending

AI agent costs commonly take two routes. The first is model API credits: OpenAI, Anthropic and OpenRouter all sell credits up front and can buy more automatically when the balance runs low. The second is an agent buying from merchants for you, which Visa and Mastercard are piloting. RDVCC has no agent-specific card and is not part of these pilots. What you can do is use a dedicated prepaid virtual credit card for API auto top-ups. With RDVCC card auto top-up off, the card balance is essentially the limit on what that card can be charged.

Where AI agent payments come from

Payment route	How it charges	Status	What you control
Model API credits	You buy credits and usage draws them down. With auto top-up, the card is charged when the balance falls below a threshold	In wide use	The threshold and amount on the platform, and the card balance
An agent buying for you	Tokenized credentials, under rules you approve in advance	Pilots and gradual rollout by card networks and platforms	The permission rules offered by the platform and issuer
Giving a browser agent your card number	The agent fills in the card on a web page like a person	Technically possible, at your own risk	The card balance and card status

Auto top-up rules at three API providers

Provider	Auto top-up	When credits run out	Expiry and refunds
OpenAI API	Prepaid credits from $5. Auto recharge buys more when the balance falls below your threshold, with an optional monthly limit on automatic recharges only	API requests return a billing error. The cutoff can lag, so the balance can go negative and is deducted from your next purchase	Expire 1 year after purchase; non-refundable unless required by law or contract
Anthropic API	Auto-reload: set the trigger balance and the balance to reload to on the Billing page. If you are already below the trigger, you are charged as soon as you turn it on	You can no longer call the API or use the playground	Expire after 1 year, cannot be extended, and are non-refundable
OpenRouter	Top up manually, or set auto top-up below a threshold	Not stated in its FAQ	OpenRouter reserves the right to expire unused credits one year after purchase. Unused credits can be refunded within 24 hours of purchase, excluding platform fees and crypto payments

Rules were reviewed on 2026-11-09, and each provider’s pages take priority. Credits are mostly non-refundable or have a short refund window, so keep each automatic top-up small.

API charges in our ledger

The window is 2026-08-11 to 11-08 and covers the API merchants of these three providers on RDVCC cards, excluding Claude and ChatGPT subscriptions. Unless noted, figures are per person with an authorization.

Measure	OpenAI API	Anthropic API	OpenRouter
People with a successful charge	About 45%	About 30%	About 79%
People with a decline	About 14%	About 9%	About 21%
Of those declined, at least one balance or limit decline	About 82%	About 79%	About 75%
Charge size (median per person)	$20	$20	$15.39
Of those charged, same amount 3+ times	About 9%	About 9%	About 9%
Of those charged, 3+ charges in a day	About 9%	About 4%	About 2%
Authorizations with a 3D Secure fee	None	None	None

People with neither a successful charge nor a decline had only verifications, reversed authorizations or unsettled authorizations, which does not mean a charge failed. The 3D Secure row depends on the mix of BINs and does not mean these providers never ask for it.

Limits: the sample is small, especially for Anthropic and OpenRouter, and the top three people make up about 58% of transactions at these providers. The ledger cannot tell which charges an agent started, or separate manual from automatic top-ups. A repeated amount only looks like an auto top-up.

Most people pay only a few times. Among those charged, about 9% paid the same amount three or more times. Three or more charges in a day apply to about 9% at OpenAI and 2% to 4% at the other two. We suggest those accounts set a limit up front. If a charge is declined, check the card balance first, since that is the most common cause.

How to cap what an agent can spend

Open a separate card for one API account. Keeping it apart from subscriptions and ads makes statements easier to reconcile.
Keep only this period’s budget on the card. A prepaid card must be topped up before it can spend. With RDVCC card auto top-up off, the card balance is essentially the limit on what it can be charged, though a settled amount can occasionally exceed the authorization. With it on, the limit becomes your account balance and the monthly auto top-up cap you set. Per-transaction fees come from your account balance if the card is short.
Set the auto top-up threshold and amount on the platform. Keep each top-up, plus any tax, below the card balance so it isn’t declined. OpenAI also lets you set a monthly limit.
Check your transaction history regularly. If you see a charge you don’t recognize, freeze the card to stop further spending. A frozen card can’t be withdrawn from: unfreeze it and wait 30 minutes after its last transaction first. If you won’t use it again, close it and the balance returns to your account after settlement.

Once the card runs out, auto top-up fails, and when API credits run out, requests stop. OpenAI’s cutoff can lag, so usage can overshoot, and the difference is deducted from your next purchase. If your agent runs a live service, keep a buffer and check the balance regularly so jobs don’t stop halfway.

Agents buying for you: card networks and OpenAI

Date	Who	What happened
2025-04	Visa	Launched Visa Intelligent Commerce so AI can find and buy for users
2025-04-29	Mastercard	Launched Agent Pay and Agentic Tokens, built on existing tokenization
2025-09	OpenAI, Stripe	Released the Agentic Commerce Protocol and Instant Checkout in ChatGPT. OpenAI’s developer docs say Instant Checkout is for approved partners; from March 2026 media reported that OpenAI scaled it back, so check OpenAI for the current status
2025-12-18	Visa	Completed hundreds of controlled, real-world agent transactions with partners
2026-06-10	Visa, OpenAI	Announced a collaboration. Transactions run within user-set permissions such as spending limits, merchant categories or required approvals, using tokenized credentials
2026-10-20	Visa, BILL, Billtrust	Launched a pilot in which authorized agents complete approved invoice payments through supplier portals

These approaches share tokenized credentials and payments under rules the user sets in advance. They require platforms and merchants to take part, and some also need issuer support. RDVCC cards are not part of them today.

Should you give an agent your card number?

We suggest avoiding it where you can (our advice, not a platform rule). Once a card number, expiry and CVC are in a prompt or a log, they may be stored. If you must do it, use a separate card, keep only enough for that purchase on it (cards have a minimum top-up, shown on the card opening page), and close it afterwards, or freeze it first, in which case the money stays on the card. If 3D Secure is required, a person has to read the code.

FAQ

Can I pay for the OpenAI API with a virtual card?

Yes. Our ledger shows ongoing successful OpenAI API charges. See the OpenAI API payment page for steps and data.

What happens if an agent spends too much?

When credits run out, requests stop, although OpenAI’s cutoff can lag and overshoot. With auto top-up on, the platform keeps buying credits as configured until the card balance runs out and the charge is declined.

Does RDVCC offer an agent-specific card?

No, and we are not part of the Visa or Mastercard agent payment pilots. What you can do today is use a regular prepaid card to cap API auto top-ups.

Can I get a refund for unused API credits?

Anthropic says credit purchases are non-refundable, and OpenAI credits are non-refundable unless required by law or contract. OpenRouter allows refunds of unused credits within 24 hours of purchase, excluding platform fees and crypto payments. Keep each top-up small.

Can I get unused money back from the card?

You can withdraw the card balance to your account balance for free. You must wait 30 minutes after the card’s last transaction, and $1 stays on the card.

What if an API auto top-up is declined?

Check the reason in your RDVCC transaction history. The most common cause in our ledger is balance or limit, so top up the card and buy credits again on the platform.

Official sources

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