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Fusebox
$7/moStarting price
0Popularity
About Fusebox
Fusebox is a spending monitor for OpenAI API users that sets a monthly dollar ceiling and sends email alerts at 50%, 80%, and 100% of that limit. The tool connects to a scoped OpenAI admin key with read-only permissions, ensuring it cannot spend funds or access sensitive data. Alerts are triggered automatically once the key is connected, without requiring manual configuration in billing settings. Free users receive an email only after exceeding the set limit, while paid users ($7/month) get early warnings at 50% and 80% to prevent unexpected charges. The service encrypts the admin key at rest and uses it solely to query usage data on a schedule. It is designed for individuals or small teams managing OpenAI API costs to avoid runaway spending from retries or leaked keys.
Key features
- Monthly spending ceiling customization
- Email alerts at 50%, 80%, and 100% of limit
- Scoped OpenAI admin key integration
- Encrypted key storage
- Usage tracking via read-only API endpoint
- Free tier with basic alerts
- Paid tier with early warnings
- No access to billing or sensitive account data
Use cases
- Preventing unexpected OpenAI API bills from runaway loops
- Monitoring side project or small team API spending
- Setting budget limits for development or testing environments
Pros
- Customizable monthly spending ceiling with granular email alerts
- Scoped OpenAI admin key prevents spending or data access beyond usage metrics
- Free tier available with basic alerts after exceeding limit
- Encrypted storage of admin keys with no data sharing or resale
- Simple setup requiring only three fields and two minutes
Cons
- No support for non-OpenAI API providers like Claude
- Free tier lacks early warnings at 50% and 80%
- Requires an OpenAI admin key with specific read-only scope
- Single-person operation with no enterprise features
Frequently asked questions about Fusebox
What does Fusebox do?
Fusebox monitors OpenAI API spending by setting a monthly dollar ceiling and sending email alerts at 50%, 80%, and 100% of that limit. It connects to a scoped OpenAI admin key with read-only permissions to track usage without spending funds or accessing sensitive data.
Who is Fusebox designed for?
The tool is designed for individuals or small teams managing OpenAI API costs to avoid unexpected charges from retries or leaked keys. It is particularly useful for side projects or small-scale applications where cost control is critical.
How does Fusebox differ from OpenAI's built-in spend alerts?
OpenAI's spend alerts require manual configuration in billing settings, which many users overlook. Fusebox activates immediately upon connecting a key, with no additional setup needed, and provides early warnings at 50% and 80% of the spending limit.
What permissions does the OpenAI admin key require?
The admin key must be scoped to `api.usage.read` only, granting read-only access to usage data. It cannot spend funds, manage billing, or access sensitive information like organization members or other keys.
How is data security handled in Fusebox?
The OpenAI admin key is encrypted at rest and used solely to query usage data on a schedule. It is never used to make model requests, shared, or stored beyond its encrypted form. The tool is built and operated by a single person with no data resale or ad networks.
How do I get started with Fusebox?
Create a scoped OpenAI admin key with the `api.usage.read` permission, then connect it to Fusebox along with your monthly spending ceiling. The tool verifies the key works before storing it, and alerts begin immediately. The process takes about 2 minutes.
