Drop-in replacement for OpenAI's API that routes to OpenAI, Anthropic, Google and more. Pay-as-you-go. No lock-in. No subscriptions.
import OpenAI from "openai";
const client = new OpenAI({
apiKey: process.env.SYNTOPEN_KEY,
baseURL: "https://your-app/api/v1",
});
const r = await client.chat.completions.create({
model: "anthropic/claude-3-5-sonnet",
messages: [{ role: "user", content: "Hello" }],
});A single platform for inference, billing, and observability.
OpenAI, Anthropic, Google, with more coming. Switch models with a string.
Use the official OpenAI SDK or any compatible client. Just change the baseURL.
Server-sent events for every provider, normalized to OpenAI's format.
Credits never expire. Top up via card, SBP, or crypto. No subscription.
Keys never stored in plaintext. Per-key spend caps, rate limits, full usage history.
Real-time dashboard. Token counts, latency, cost per request — for every key.
You pay the upstream provider's price. We don't hide a markup in the token count.
Welcome credit on signup. Try every model.
No subscription. Pay only for tokens you use.
Volume pricing, SSO, SLA. Contact us.