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.

Only ~a quarter of your work needs the best model. One routing policy fixes the mix.

BEFORE · all frontier

10,000 sessions$4,000 / mo

AFTER · right-sized

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

03 — Anywhere

Local 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