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This section is for Respan LLM gateway users.
Use Respan Gateway to call OpenRouter models while keeping unified observability (logs, cost, latency, and reliability metrics) in Respan — and optionally charge usage to your own OpenRouter credits.

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Prerequisites

  • A Respan API key
  • An OpenRouter API key (BYOK credits)

Get OpenRouter API key

Retrieve your API key from OpenRouter to begin integration.

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Supported SDKs / integrations

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Configuration

There are 2 ways to add your OpenRouter credentials to your requests:

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Via UI (Global)

1

Navigate to Providers

Go to the Providers page. This page allows you to manage credentials for over 20+ supported providers.
Respan Providers Page
2

Add your OpenRouter API Key

Select OpenRouter and paste your API key.
Add OpenRouter Credentials
3

Configure Load Balancing (Optional)

You can add multiple OpenRouter API keys for redundancy. Use the Load balancing weight field to determine how traffic is distributed between keys.

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Via code (Per-Request)

You can pass credentials dynamically in the request body. This is useful if you need to use your users’ own API keys (BYOK credits). Add the customer_credentials parameter to your Gateway request: 
{
  // Rest of the request body
  "customer_credentials": {
    "openrouter": {
      "api_key": "YOUR_OPENROUTER_API_KEY"
    }
  }
}

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Log OpenRouter requests

If you are not using the Gateway to proxy requests, you can still log your OpenRouter requests to Respan asynchronously. This allows you to track cost, latency, and performance metrics for external calls.
OpenRouter Python SDK
import requests

url = "https://api.respan.ai/api/request-logs/create/"
payload = {
    "model": "openai/gpt-4o",
    "prompt_messages": [
        {
            "role": "user",
            "content": "Explain quantum computing"
        }
    ],
    "completion_message": {
        "role": "assistant",
        "content": "Quantum computing is a computing paradigm that uses quantum mechanics to process information..."
    },
    "cost": 0.002,
    "generation_time": 3.1,
    "customer_params": {
        "customer_identifier": "user_789"
    }
}
headers = {
    "Authorization": "Bearer YOUR_RESPAN_API_KEY",
    "Content-Type": "application/json"
}

response = requests.post(url, headers=headers, json=payload)

Get Started with Logging

Learn how to set up comprehensive logging for all your LLM requests