AI API spend limit
How to set a hard AI API spend limit before requests run
The safest AI API budget is checked before a request is routed. A prepaid gateway can reject new calls when wallet balance, key budget, model policy, or output limits would be exceeded.
Start with a prepaid wallet
A prepaid wallet turns API usage into a fixed-risk test. New requests can stop at zero balance instead of turning into an invoice surprise later.
Add limits per key
A single shared key is hard to control. Separate keys make it clear which app, teammate, customer, or coding agent is spending.
- Set daily and monthly budgets per key
- Use model allowlists for each workflow
- Cap max output tokens before agent testing
- Disable one risky key without disrupting other traffic
Use logs after the first request
Request logs confirm whether the client used the expected model, how many tokens were metered, and how much wallet balance was deducted.
FAQ
Can an AI API spend limit be enforced before a request?
Yes. A gateway can check wallet balance, key budget, model policy, and output caps before sending a request upstream.
What should I check after setting a budget?
Run one small request and review the request log for model, token meters, status, and billed amount.