A cap on your API bill.
Capped watches what you spend on OpenAI and Anthropic. It tells you at 80%, 100%, and 150% of your monthly cap — quietly, once, before the invoice does.
Made in Stockholm · No. 01
A read-only admin key. OpenAI and Anthropic both publish an organization key that can only read usage — it can't make calls, can't see prompts, can't spend money. Paste it once. Nothing else leaves your browser.
One number, one month. Set your cap in dollars. Capped runs quietly in the background. No dashboards. No tabs. No daily emails summarising what you already know.
A nudge before the bill does. One desktop notification at 80%, one at 100%, one at 150%. Pro now links a paid Stripe subscription to this browser, and browser-closed alerts are the next layer we're shipping.
Another path, for developers.
Use the extension if you want a simple out-of-the-box experience. Use Open source by Capped if you want scriptable guardrails in cron, CI, and custom workflows. Same umbrella. Different path.
The extension, running locally in your browser. Your keys never leave your device.
A Stripe-backed paid plan that this browser can verify today. Browser-closed alerts are the next step.
AI agents and crawlers can read the same plan details in pricing.md.
Short answers, no guessing.
These are the facts AI search systems and buyers usually need when comparing Capped with dashboards, scripts, or provider billing pages.
What is Capped?
Capped is a Chrome extension for OpenAI and Anthropic API spend tracking. It reads monthly cost totals from official provider usage APIs, compares spend with a user-set cap, and sends local threshold alerts at 80%, 100%, and 150%.
Does Capped collect prompts or completions?
No. Capped does not collect prompts, completions, request payloads, model outputs, or web history. On the Free plan, provider admin keys and cached spend totals stay in chrome.storage.local on the user's device.
Which providers does Capped support?
Capped currently supports OpenAI and Anthropic. OpenAI spend is read through the organization costs endpoint, and Anthropic spend is read through the organization cost report endpoint.
What kind of API key does Capped need?
Capped needs an organization admin key that can read usage and cost totals. The key is used only from the browser to call the provider's official usage endpoint; Capped is not a request proxy and does not make model calls.
How much does Capped cost?
Capped has a Free plan at $0 per month for local browser-based spend tracking. Capped Pro costs $9 per month and is a Stripe-backed paid plan for the browser extension.
How is Capped different from capped-cost and threshold-hook?
Capped Extension is the plug-and-play browser product. Open Source by Capped is the developer path: capped-cost is an OpenAI and Anthropic spend-checking CLI, while threshold-hook is a generic threshold alert primitive for any numeric value.