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@ai-billing/gateway
@ai-billing/gateway / createGatewayV3Middleware

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Function: createGatewayV3Middleware()

createGatewayV3Middleware<TTags>(options): LanguageModelV3Middleware
Defined in: gateway/src/ai-sdk/language-model-middleware/v3/language-model-v3-ai-gateway-billing-middleware.ts:101 Creates a V3 billing middleware configured for the Vercel AI Gateway provider. Extracts cost and usage data from gateway-specific provider metadata.

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Type Parameters

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TTags

TTags extends JSONObject The shape of the tags object, extending DefaultTags. Defaults to standard tags.

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Parameters

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options

GatewayV3MiddlewareOptions<TTags> Shared billing options; see GatewayV3MiddlewareOptions for what you can pass and what is implied by the gateway provider.

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Returns

LanguageModelV3Middleware A V3 billing middleware instance for the AI Gateway.

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Example

Same wiring as examples/dev-sandbox/app/api/gateway (createGatewayMiddleware is this function’s export alias from @ai-billing/gateway). 
import { createGateway, wrapLanguageModel } from 'ai';
import { createGatewayMiddleware } from '@ai-billing/gateway';
import { consoleDestination } from '@ai-billing/core';

const gateway = createGateway({ apiKey: process.env.AI_GATEWAY_API_KEY });

const billingMiddleware = createGatewayMiddleware({
  destinations: [consoleDestination()],
});

const wrappedModel = wrapLanguageModel({
  model: gateway('gpt-5'),
  middleware: billingMiddleware,
});