One API for LLMs.

The one platform that devs, CFOs and security teams love. Why devs love it Secrets, crons, keys — wired the moment a project opens. Swap the model or the machine under a live session: next month's model is a config change, not a rewrite. Why CFOs love it Every run attributed — per product, per user. Caps on by default: one runaway agent can't write the invoice. Most runs ride subscriptions you already pay. The bill gets boring. Why security teams love it Keys stay in your vault — values never transit cerver. Client-safe publishable keys for the browser. Every run leaves a transcript: an audit trail by default.

no card · $5 free tier

works with OpenAIAnthropicDeepSeekGLMxAI

01 — At scale

Learn from thousands of agents that your users run.

Fan out to thousands of sessions at once. Click any agent and watch its session — the chat, the model, the compute, the cost.

02 — The mix

Stop running everything on the most expensive model.

Most fleets run 100% frontier by reflex. Your work isn't 100% frontier-shaped: about a quarter earns the best model, the rest doesn't notice the difference. A routing policy — rules you write, or one line of auto — makes the mix deliberate.

Today · all frontier

10,000 sessions$4,000 / mo

Right-sized · 25 / 35 / 40

same 10,000 sessions$1,540 / mo · −62%
Browse routing policies → What it saves you

03 — Anywhere

Local and/or cloud.

Hosted model sessions work instantly. When the session needs your repo, terminal, tools, or CLI agents, attach the relay and keep the same session boundary.

Models
Claude Opus 4.8
GPT-5
Grok 4
Gemma 4
Runtimes
Claude Code
Codex CLI
OpenAI SDK
xAI
Compute
Vercel
E2B
Cloudflare
Modal
your machine

no card · $5 free tier