OpenAI-compatible API gateway

Never expose your AI API keys in code again.

Mux API sits between your app and your AI providers. Ship virtual keys to clients, keep the real ones locked away.

Mux API sits between your app and your AI providers. Ship virtual keys to clients, keep the real ones locked away, and get fallback routing, rate limits and usage tracking out of the box.

Read the docs

No credit card required. Works with any OpenAI-compatible provider.

request.sh

# your app only ever sees the virtual key
curl https://api.muxapi.dev/v1/chat/completions \
  -H "Authorization: Bearer kc_live_8f3a…" \
  -d '{"model":"gpt-4o-mini","messages":[…]}'

What Mux API does

Authenticatesvirtual key kc_live_8f3a…
Checks limits42 / 60 req per min
Routesprimary key → 503 → fallback key
Logs200 · 412 tokens · 840 ms

request.sh

# your app only ever sees the virtual key
curl https://api.muxapi.dev/v1/… \
  -H "Bearer kc_live_8f3a…"

What Mux API does

Authenticates virtual key
Checks limits — 42 / 60 rpm
Routes — primary 503 → fallback key
Logs — 200 · 412 tokens · 840 ms

Route toOpenAIAnthropicGoogle GeminiGroqTogetherAny OpenAI-compatible API

Route to

OpenAI · Anthropic · Google Gemini · Groq · Together · any OpenAI-compatible API

Features

Everything between your app and the model.

One small gateway that replaces a pile of ad-hoc proxy code.

Virtual keys

Hand your apps a revocable virtual key. Your real provider keys never leave the server, so a leaked client key is a one-click fix.

Fallback routing

Route each virtual key to one or more real keys in priority order. When a provider errors out, traffic moves on automatically.

Rate limits and quotas

Cap requests and tokens per key. Stop a runaway loop or a noisy tenant before it becomes a surprise invoice.

Usage and request logs

See requests, tokens and errors per key and route, with the caller IP on every log line. Export to CSV whenever you need it.

Encrypted at rest

Real keys are encrypted before they touch the database and are only decrypted inside the gateway at request time.

OpenAI-compatible

Change one base URL and one key. Existing SDKs, frameworks and curl commands keep working exactly as before.

Virtual keys

Hand your apps a revocable virtual key. A leaked client key is a one-click fix.

Fallback routing

If a provider errors, traffic moves to the next route automatically.

Rate limits and quotas

Cap requests and tokens per key before they become a surprise invoice.

Usage and request logs

Requests, tokens and errors per key, with the caller IP on every line.

How it works

From pasted key to protected traffic in three steps.

Add your real keys

Paste provider keys once. They are encrypted and never shown to your app again.

Create a virtual key

Set limits, pick routes and fallbacks. Copy the key. It is shown once.

Point your app at the gateway

Swap the base URL. Requests are authenticated, limited, routed and logged.

Three steps, two lines of code.

Add your real keys

Paste provider keys once. They are encrypted and never shown again.

Create a virtual key

Set limits, pick routes and fallbacks. Shown once.

Point your app at the gateway

Swap the base URL. That is the whole migration.

Quickstart

A two-line change.

Keep your SDK. Swap the base URL and use a virtual key. Nothing else in your code has to change, and nothing secret ships to the browser.

Full API reference

client.ts

import OpenAI from "openai";

const client = new OpenAI({
- apiKey: process.env.OPENAI_API_KEY,
+ apiKey: "kc_live_8f3a…",
+ baseURL: "https://api.muxapi.dev/v1",
});

Pricing

Simple pricing.

Start free. Upgrade when you ship. Every plan includes all features — only volume, rate limits and log retention differ.

Trial

Try Mux API

Free

100 lifetime requests
10 RPM
7-day logs
All features included

Start free

Starter

For side projects

$3 /mo

10,000 requests / month
30 RPM
30-day logs
All features included

Choose plan

Pro

For production apps

$5 /mo

20,000 requests / month
60 RPM
60-day logs
All features included

Choose plan

Scale

For growing traffic

$10 /mo

50,000 requests / month
120 RPM
90-day logs
All features included

Choose plan

Need more than 50,000 requests per month? Contact us for Enterprise.

Stop shipping secrets.

Create your first virtual key in under two minutes.