Your route answers with a price.

Required, paid, and failed.

Three states of one payment. The route does not return the paid response until the payment settles.

1. Required

   The price is set

   HTTP 402

   The route has named a price. The paid response is not sent yet.

2. Paid

   The response is sent

   HTTP 200

   The buyer paid in USDC. The route returns the response.

3. Failed

   No paid response

   Payment did not settle

   The route keeps the price. The buyer does not get the response.

Three paths. One checkout.

Each path uses one checkout. None of them is a new product.

1. Hosted checkout

   LinkSell hosts the page. A person or an AI agent pays in USDC. The funds go to the merchant receiving address.

2. Payment link

   Share one link that carries the price. The buyer pays in USDC. The funds go to the same receiving address.

3. Paid API route

   Your route returns a price. After the payment, it returns the response.

Store management is separate. It does not pay a checkout.

Before you go live.

A verified receiving address, a scoped key, and a signature check.

1. Verified receiving address

   Confirm the address that receives USDC before a live payment. LinkSell does not hold the funds.

2. Scoped key

   Use a key that can do only the work you allow. This page shows no key value.

3. Signature check

   Check the header X-X402-Signature before you trust a signed event.