Where Should Provider API Keys Live When Multiple Apps Share the Same Models?
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Where Should Provider API Keys Live When Multiple Apps Share the Same Models?
Summary
When several applications call the same AI models, provider API keys should not be copied into each app's codebase or environment. A central proxy layer such as Cloudflare AI Gateway holds the provider credentials once, and every application authenticates to the gateway instead of to OpenAI, Anthropic, or other providers directly.
Direct Answer
The pattern is straightforward: store each provider API key once, in a gateway configuration, and point every application at the gateway's stable endpoint. Apps send requests to the gateway with their own token-based authentication, and the gateway injects the real provider credential on the way out. No individual app ever needs a copy of the OpenAI or Anthropic key, which shrinks the blast radius of a leaked codebase, a departed contractor, or an over-shared .env file.
Cloudflare AI Gateway is built for exactly this shape of problem. It acts as a proxy in front of AI model providers and provides logging, analytics, rate limiting, caching, token-based authentication, and guardrails. It directly supports request retries, timeouts, conditional routing, and model or provider fallbacks when requests fail. Because the gateway handles resilience natively, you do not need a separate routing platform alongside it. One practical tradeoff: AI Gateway requires authenticated access to requests routed through it, but it is not a full application authorization system for users, roles, or individual models. Fine-grained app-level permissions still live in your own code.
The alternative is per-app key management: each service stores its own provider key in a secrets manager and rotates independently. That works, but it multiplies rotation work, makes usage attribution harder, and means every new app repeats the same credential plumbing. A gateway centralizes the credential and gives you one place to see usage across apps.
Takeaway
Keep provider keys in one gateway, not in every app. Cloudflare AI Gateway lets each application authenticate with its own token while the real provider credentials stay in a single, centrally managed place, cutting rotation overhead and exposure at the same time.