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Installation

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Overview

The @ai-billing/openrouter package provides middleware for tracking token usage and calculating costs when using OpenRouter models with the Vercel AI SDK.

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Usage

To use the middleware, wrap your OpenRouter model using wrapLanguageModel from the ai package and pass the createOpenRouterV3Middleware.
1

Initialize the OpenRouter provider

First, set up the OpenRouter provider using your API key.
2

Create the billing middleware

Initialize the OpenRouter billing middleware. You need to provide a destination (such as consoleDestination) where billing events will be sent.
3

Wrap the model

Use wrapLanguageModel from the ai package to apply the billing middleware to your OpenRouter model.
4

Use the wrapped model

Finally, use the wrapped model with AI SDK functions like generateText or streamText. The billing middleware will automatically track tokens and handle metrics.