How do I add billing to my Next.js app?

Install the Commet SDK, add your API key, and start billing. Follow the [Next.js integration guide](/docs/integrate-with-nextjs) for a step-by-step walkthrough with code examples.

Commet

Add billing with
Next.js

Start billing for free Read docs

Built for Next.js

Billing that fits your stack

Subscribe customers in Server Actions, check entitlements in middleware, and track usage in API routes. The Next.js integration works with App Router and Server Components out of the box.

app/actions/billing.ts

"use server";

import { commet } from "@/lib/commet";
import { redirect } from "next/navigation";

export async function subscribe(customerId: string) {
  await commet.customers.create({
    email: "user@example.com",
    id: customerId,
  });

  const subscription = await commet.subscriptions.create({
    customerId,
    planCode: "pro",
  });

  redirect(subscription.data.checkoutUrl);
}

"use server";

import { commet } from "@/lib/commet";
import { redirect } from "next/navigation";

export async function subscribe(customerId: string) {
  await commet.customers.create({
    email: "user@example.com",
    id: customerId,
  });

  const subscription = await commet.subscriptions.create({
    customerId,
    planCode: "pro",
  });

  redirect(subscription.data.checkoutUrl);
}

Get started

Install in seconds

Install the Commet SDK and add billing to your Next.js app. Server Actions, App Router, and checkout — all working in minutes.

Get started Documentation

Terminal

npm install @commet/node @commet/next

npm install @commet/node @commet/next

Frequently Asked Questions

Install the Commet SDK, add your API key, and start billing. Follow the Next.js integration guide for a step-by-step walkthrough with code examples.

Commet supports metered (pay for what you use), credits (block when exhausted), balance (spend across features), seats (per-user pricing), and boolean (feature gating). Learn more in the consumption models guide.

Yes. Call the usage tracking method whenever a billable event happens. Commet aggregates usage and bills it at the end of each billing period. Works for API calls, AI tokens, storage, or any custom metric. See the usage tracking guide for details.

Yes. Commet has a built-in AI model catalog with per-token pricing. You can track input, output, and cache tokens with configurable margins. See the AI token billing guide for setup instructions.

Yes. Commet is a Merchant of Record that handles taxes, compliance, refunds, and payouts. Stripe Tax is integrated for automatic tax calculation. Read more about the Merchant of Record model.

Commet has no setup fees and no monthly minimums. You only pay 4.5% + $0.40 per successful transaction. You can start building and testing for free using the sandbox environment. See pricing for details.

Start billing in minutes

No setup fees. No monthly minimums. 4.5% + $0.40 per successful transaction.

Start billing for free

"use server";

import { commet } from "@/lib/commet";

import { redirect } from "next/navigation";

export async function subscribe(customerId: string) {

await commet.customers.create({

email: "user@example.com",

id: customerId,

});

const subscription = await commet.subscriptions.create({

customerId,

planCode: "pro",

});

redirect(subscription.data.checkoutUrl);

}

"use server";

import { commet } from "@/lib/commet";

import { redirect } from "next/navigation";

export async function subscribe(customerId: string) {

await commet.customers.create({

email: "user@example.com",

id: customerId,

});

const subscription = await commet.subscriptions.create({

customerId,

planCode: "pro",

});

redirect(subscription.data.checkoutUrl);

}

Add billing withNext.js

Billing that fits your stack

Install in seconds

Frequently Asked Questions

Start billing in minutes

Add billing withNext.js

Billing that fits your stack

Install in seconds

Frequently Asked Questions

Start billing in minutes

Add billing with
Next.js

Add billing with
Next.js