How do I add billing to my Express app?

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

Commet

Add billing with
Express

Start billing for free Read docs

Built for Express

Billing that fits your stack

Mount billing as a router, protect routes with middleware, and handle webhooks with Express's raw body parser. Everything follows the patterns you already use.

src/routes/billing.ts

import { Router } from "express";
import { commet } from "../commet";

const router = Router();

router.post("/subscribe", async (req, res) => {
  await commet.customers.create({
    email: req.body.email,
    id: req.body.customerId,
  });

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

  res.json({ checkoutUrl: sub.data.checkoutUrl });
});

import { Router } from "express";
import { commet } from "../commet";

const router = Router();

router.post("/subscribe", async (req, res) => {
  await commet.customers.create({
    email: req.body.email,
    id: req.body.customerId,
  });

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

  res.json({ checkoutUrl: sub.data.checkoutUrl });
});

Get started

Install in seconds

Add billing routes to your Express app with the Commet SDK. Subscriptions, usage tracking, and webhooks in a few lines of code.

Get started Documentation

Terminal

npm install @commet/node

npm install @commet/node

Frequently Asked Questions

Install the Commet SDK, add your API key, and start billing. Follow the Express 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

import { Router } from "express";

import { commet } from "../commet";

const router = Router();

router.post("/subscribe", async (req, res) => {

await commet.customers.create({

email: req.body.email,

id: req.body.customerId,

});

const sub = await commet.subscriptions.create({

customerId: req.body.customerId,

planCode: "pro",

});

res.json({ checkoutUrl: sub.data.checkoutUrl });

});

import { Router } from "express";

import { commet } from "../commet";

const router = Router();

router.post("/subscribe", async (req, res) => {

await commet.customers.create({

email: req.body.email,

id: req.body.customerId,

});

const sub = await commet.subscriptions.create({

customerId: req.body.customerId,

planCode: "pro",

});

res.json({ checkoutUrl: sub.data.checkoutUrl });

});

Add billing withExpress

Billing that fits your stack

Install in seconds

Frequently Asked Questions

Start billing in minutes

Add billing withExpress

Billing that fits your stack

Install in seconds

Frequently Asked Questions

Start billing in minutes

Add billing with
Express

Add billing with
Express