OpenAI Compatibility

Quota implements the OpenAI API spec. Change your baseURL and apiKey, and your existing code works with no other changes.

What changes

Before (OpenAI direct)After (Quota)
Base URLhttps://api.openai.com/v1https://api.usequota.ai/v1
API Keysk-... (OpenAI key)sk-quota-... (Quota key)
Everything elseSame models, same parameters, same response format

curl

curl https://api.usequota.ai/v1/chat/completions \
  -H "Authorization: Bearer sk-quota-YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-4o-mini",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Node.js (OpenAI SDK)

import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.usequota.ai/v1",  // <- only change
  apiKey: process.env.QUOTA_API_KEY,        // <- only change
});

// Existing code works as-is
const response = await client.chat.completions.create({
  model: "gpt-4o-mini",
  messages: [{ role: "user", content: "Hello!" }],
});

console.log(response.choices[0].message.content);

Python (OpenAI SDK)

from openai import OpenAI

client = OpenAI(
    base_url="https://api.usequota.ai/v1",  # <- only change
    api_key="sk-quota-YOUR_KEY",              # <- only change
)

response = client.chat.completions.create(
    model="gpt-4o-mini",
    messages=[{"role": "user", "content": "Hello!"}],
)

print(response.choices[0].message.content)

Multi-provider models

Through the same API, you can also use Anthropic and Google models by prefixing the model name. No extra SDKs or API keys needed.

// Anthropic Claude - same OpenAI SDK, same API
const claude = await client.chat.completions.create({
  model: "anthropic/claude-sonnet-4.5",
  messages: [{ role: "user", content: "Hello from Claude!" }],
});

// Google Gemini - same OpenAI SDK, same API
const gemini = await client.chat.completions.create({
  model: "google/gemini-3-flash",
  messages: [{ role: "user", content: "Hello from Gemini!" }],
});

Supported providers

ProviderModel prefixExample
OpenAInone (default)gpt-4o-mini
Anthropicanthropic/anthropic/claude-sonnet-4.5
Googlegoogle/google/gemini-3-flash

What you get

  • One API key for OpenAI, Anthropic, and Google models
  • Per-user billing so your users pay for their own usage
  • Usage tracking with per-request credit costs in every response
  • Streaming works identically to OpenAI (SSE format)

Next steps