Glossary
Spend cap (API)
A hard monthly or daily limit on what an API key can charge, set at the provider, after which requests fail.
The cheapest control against LLMjacking: a stolen key with a cap loses a bounded amount. Pair it with a model and region allow-list, because a cap limits the bill, not what the key can reach. Railway's October breach ran up about $740,000 across customer keys that mostly had neither.
Related terms
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