One proxy key.
Every LLM model.
Meridian is an open-source LLM API gateway. Add your provider keys once, get a proxy key, and call any model through a unified OpenAI-compatible API. Your real keys never touch your app code.
// Every file, every service...
const openai = new OpenAI({
apiKey: "sk-real-key-exposed"
});
const anthropic = new Anthropic({
apiKey: "sk-ant-another-key"
});// One key. Any model.
const res = await fetch(
"https://your.meridian/api/v1/chat/completions",
{
headers: {
Authorization: "Bearer sk-mrd-..."
},
body: JSON.stringify({
model: "gpt-4.1", // or claude, gemini...
messages: [{ role: "user", content: "Hi" }]
})
}
);The problem with LLM APIs today
Key Chaos
API keys scattered across .env files, config services, and code. One leak and you're exposed.
Zero Visibility
No idea which team, app, or feature is burning through your LLM budget until the bill arrives.
Vendor Lock-in
Switching from GPT-4 to Claude means rewriting API calls everywhere. No easy way to compare.
Everything you need to manage LLM access
Proxy Keys
Generate revocable proxy keys. Your real API keys stay encrypted and hidden.
AES-256 Encryption
Provider keys encrypted at rest with AES-256-GCM. Decrypted only for the instant of the request.
Unified API
OpenAI-compatible endpoint for all providers. One format, every model.
Analytics & Cost Tracking
Per-request logging with token counts, latency, and cost estimates. Real-time dashboard.
A/B Experiments
Route traffic between models with configurable splits. Compare cost and latency.
100% Open Source
Apache 2.0 licensed. Self-host anywhere. Full control over your LLM infrastructure.
How it works
Add your API keys
Connect OpenAI, Anthropic, or Google Gemini. Keys are encrypted instantly.
Generate a proxy key
Create a revocable proxy key (sk-mrd-...). Use it in all your apps.
Call the latest models
Hit the unified API. Meridian routes, logs, and returns the response.
Supported Providers
More providers coming soon. Contributions welcome.
OpenAI
GPT-4.1, GPT-4.1 Mini, GPT-4o, GPT Image 1
Anthropic
Claude Sonnet 4, Claude Opus 4, Claude 3.7 Sonnet
Google Gemini
Gemini 2.5 Pro, Gemini 2.5 Flash, Gemini 2.0 Flash
Built in the open
Meridian is Apache 2.0 licensed. Inspect every line of code. Self-host on your own infrastructure. Contribute features the whole community needs.
