Add BYOK to an Existing App

Keep paying your provider directly while moving traffic through AnyRouter for logs, analytics, routing, and presets. BYOK requests have no per-token AnyRouter fee and never draw down credits; requests with no matching BYOK key use credits at the listed model price.

1. Add your provider key (OpenAI, Anthropic, and others) at Settings → BYOK. It is encrypted at rest.

2. Create an sk-ar- key in Dashboard → Keys. This is the only key your app sends.

3. Change the base URL and key. The request body stays the same:

   import OpenAI from "openai"
   
   const client = new OpenAI({
     baseURL: "https://anyrouter.dev/api/v1",
     apiKey: process.env.ANYROUTER_API_KEY, // sk-ar-v1-...
   })
   
   const completion = await client.chat.completions.create({
     model: "openai/gpt-5.4-mini",
     messages: [{ role: "user", content: "Hello from my app" }],
   })

   This request is served with your OpenAI account.

4. Optional: keep credits funded and set "provider": { "allow_fallbacks": true } so a rate-limited or out-of-quota BYOK provider falls back to a credit-billed upstream. See Smart Routing.