Welcome to Synapse Garden

One API key for every LLM. Drop-in OpenAI- and Anthropic-compatible. Per-project keys, transparent metering, no surprise bills.

FIG.

FIG. 00 · INDEXONE KEY · MANY MODELS

What is Synapse Garden?

Synapse Garden is a drop-in API for over 100 language, image, and video models — OpenAI, Anthropic, Google, Meta, Mistral, DeepSeek, and more — all behind a single endpoint. Use the OpenAI SDK, the Anthropic SDK, the AI SDK, or plain fetch. Change the base URL, keep your code.

Three minutes to your first token

The fastest path to a successful response: Quickstart. No credit card required for the free tier.

FIG. 01REQUEST LIFECYCLE

SCHEMATIC

Every request flows through key validation, governance, and the upstream provider. Logging forks off the synchronous path so it never adds latency. Our internal overhead stays inside ~12 ms, total P95 ≤ 50 ms vs calling the provider direct.

Quickstart

import { generateText } from "ai"

const { text } = await generateText({
  model: "openai/gpt-5.4",
  baseURL: "https://synapse.garden/api/v1",
  apiKey: process.env.MG_KEY,
  prompt: "Why is the sky blue?",
})

console.log(text)

import OpenAI from "openai"

const client = new OpenAI({
  apiKey: process.env.MG_KEY,
  baseURL: "https://synapse.garden/api/v1",
})

const res = await client.chat.completions.create({
  model: "openai/gpt-5.4",
  messages: [{ role: "user", content: "Why is the sky blue?" }],
})

What you get on day one

Per-project API keys

Issue mg_live_* keys scoped per project. Hashed at rest. Revoke and rotate without redeploying.

Honest metering

Token-accurate logs and atomic credit deduction. No surprise overage at month end.

Governance, by default

Per-project model allowlists, RPM and TPM rate limits, hard spend caps. Audit trail on every action.

One catalog, every model

GPT, Claude, Gemini, Llama, plus image and video models — all behind one endpoint.

Try it now

Live in your browser

Live · sandbox key

Edit the request, hit run. We use a sandbox key on this page so you don't need to sign up to try it.

Model

Output appears here.

Sandbox · ratelimited 5/min/IPGet your own key →

Where to go next

Quickstart — sign up, get a key, ship a request
Authentication — API keys, OIDC, key rotation, per-environment patterns
Models & providers — the full catalog, pricing, modalities
Provider routing — order / only / sort, model fallbacks, timeouts
Governance — projects, allowlists, spend caps, audit log
API reference — auto-generated from our OpenAPI spec

Need help?

Email hi@synapse.garden — same-day reply during the beta. Or open an issue against the docs from the link in the bottom-right of any page.