# Overview

**Infron supports the** [**OpenResponses API**](https://openresponses.org/) **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:

{% tabs %}
{% tab title="Python" %}

```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!',
    }
)
```

{% endtab %}

{% tab title="TypeScript" %}

```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!',
  }),
});
```

{% endtab %}

{% tab title="cURL" %}

```shellscript
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!"
  }'
```

{% endtab %}
{% endtabs %}

### 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

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