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Fort Card lets developers issue scoped, capped API credentials instead of raw keys

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Fort Card is an open-source tool that applies a credit-card-like model to API key management, addressing the security risk of sharing unrestricted API keys with AI agents. Instead of exposing a master key, the system stores it inside a Cloudflare Worker called a lockbox, which is the only component that ever handles the plaintext credential. Agents receive a 'card' that is restricted to a specific host, limited to a set number of uses, and can be frozen instantly if needed. When an agent makes a request, the lockbox injects the real key server-side and returns only the response, so the agent never sees the underlying credential. The project is released under the MIT license and can be self-hosted via GitHub, with an optional hosted version available at $8 per month.

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