OpenRouter is a tool that helps you integrate multiple NLP APIs in your application. It provides a single API endpoint that you can use to call multiple NLP APIs. You can follow their documentation here: https://openrouter.ai/docs#quick-start

​
Gateway Integration

1

Create a Helicone account

Log into helicone or create an account. Once you have an account, you can generate an API key.
2

Create an OpenRouter account

Log into www.openrouter.ai or create an account. Once you have an account, you can generate an API key.
3

Set HELICONE_API_KEY and OPENROUTER_API_KEY as environment variable

HELICONE_API_KEY=<your API key>
OPENROUTER_API_KEY=<your API key>
4

Modify the base URL and add Auth headers

Replace the following OpenRouter URL with the Helicone Gateway URL:https://openrouter.ai/api/v1/chat/completions -> https://openrouter.helicone.ai/api/v1/chat/completionsand then add the following authentication headers.
Helicone-Auth: `Bearer ${HELICONE_API_KEY}`
Authorization: `Bearer ${OPENROUTER_API_KEY}`
Now you can access all the models on OpenRouter with a simple fetch call:

​
Example

fetch("https://openrouter.helicone.ai/api/v1/chat/completions", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${OPENROUTER_API_KEY}`,
    "Helicone-Auth": `Bearer ${HELICONE_API_KEY}`,
    "HTTP-Referer": `${YOUR_SITE_URL}`, // Optional, for including your app on openrouter.ai rankings.
    "X-Title": `${YOUR_SITE_NAME}`, // Optional. Shows in rankings on openrouter.ai.
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    model: "openai/gpt-4o-mini", // Optional (user controls the default),
    messages: [{ role: "user", content: "What is the meaning of life?" }],
    stream: true,
  }),
});
We now also support streaming in responses from OpenRouter.
Note: usage data and cost calculations while streaming are only offered for OpenAI and Anthropic models. For non-stream requests, usage data and cost calculations are available for all models.
For more information on how to use headers, see Helicone Headers docs. And for more information on how to use OpenRouter, see OpenRouter Docs.