Overview

Infron supports the OpenResponses API specification, an open standard for AI model interactions. OpenResponses provides a unified interface across providers with built-in support for streaming, tool calling, reasoning, and multi-modal inputs.

Base URL

The OpenResponses-compatible API is available at:

https://llm.onerouter.pro/v1

Authentication

The OpenAI-compatible API supports the same authentication methods:

• API key: Use your Infron API key with the Authorization: Bearer <token> header

Getting started

Here's a simple example to generate a text response:

Python

import requests

response = requests.post(
    'https://llm.onerouter.pro/v1/responses',
    headers={
        'Authorization': 'Bearer <API_KEY>',
        'Content-Type': 'application/json',
    },
    json={
        'model': 'o4-mini',
        'input': 'Hello, world!',
    }
)

TypeScript

const response = await fetch('https://llm.onerouter.pro/v1/responses', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer <API_KEY>',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    model: 'o4-mini',
    input: 'Hello, world!',
  }),
});

cURL

curl -X POST https://llm.onerouter.pro/v1/responses \
  -H "Authorization: Bearer <API_KEY>" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "o4-mini",
    "input": "Hello, world!"
  }'

Error handling

The API returns standard HTTP status codes and error responses:

Common error codes

• 400: Bad Request (invalid or missing params, CORS)

• 401: Invalid credentials (OAuth session expired, disabled/invalid API key)

• 402: Your account or API key has insufficient credits. Add more credits and retry the request.

• 403: Your chosen model requires moderation and your input was flagged

• 408: Your request timed out

• 429: You are being rate limited

• 502: Your chosen model is down or we received an invalid response from it

• 503: There is no available model provider that meets your routing requirements

Error response format

{
    "error": {
        "message": "",
        "type": "",
        "param": "",
        "code": 429
    }
}