Fusebox
Spend-ceiling alerts for solo OpenAI API users
Fusebox is a spend-alert tool for OpenAI API usage. Set a monthly dollar ceiling and get emailed at 50%, 80%, and 100% of it - before a retry loop or a leaked key turns a $12 side project into a $300 surprise. The key it asks for is scoped to api.usage.read only, so it can never spend or manage anything. Free tier warns you once you hit 100%; the $7/mo tier adds early warnings at 50% and 80% so you catch the problem before it becomes a bill.
Features
Set a monthly $ spend ceiling for your OpenAI API key
Get emailed at 50%, 80%, and 100% of your ceiling (paid tier includes the 50/80% early warnings; free tier gets the 100% alert)
Read-only key scope (api.usage.read) - it can never spend or manage anything
We verify the key works before storing anything
No dashboard to babysit - you only hear from it when something needs attention
Use Cases
Solo devs and indie hackers running OpenAI-powered side projects who don't want a retry loop to turn into a surprise bill
Anyone who has ever forgotten a spend limit exists in OpenAI's own billing settings, buried and easy to miss
Catching a leaked or misused API key before it racks up real cost
Teams who want a second, independent set of eyes on OpenAI spend outside the OpenAI dashboard itself
Comments
Built this after I almost got hit by a runaway retry loop on my own OpenAI-powered side project - the kind of thing that turns a $12 experiment into a $300 surprise overnight. OpenAI does have a spend alert already, but it's a single manually-set number buried in billing settings that most people never find. Fusebox is live the moment you connect a key, no digging required. The key it asks for is scoped to read-only usage data - it can't spend or manage anything. One person built and runs this, happy to answer anything about the design decisions.
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Comments
Built this after I almost got hit by a runaway retry loop on my own OpenAI-powered side project - the kind of thing that turns a $12 experiment into a $300 surprise overnight. OpenAI does have a spend alert already, but it's a single manually-set number buried in billing settings that most people never find. Fusebox is live the moment you connect a key, no digging required. The key it asks for is scoped to read-only usage data - it can't spend or manage anything. One person built and runs this, happy to answer anything about the design decisions.
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