Download websites that use Fast Checkout

About Fast Checkout

Checkout is where an ecommerce site stops experimenting. Everything upstream can be swapped without much consequence, but the payment step is tied to a merchant account, a fraud posture, a reconciliation process and whatever the finance team is willing to explain to an auditor, so a third party button that captures the purchase is a serious commitment rather than a plugin choice. Fast Checkout is one of those buttons, recorded here as a Ecommerce integration from Fast AF Inc. and delivered as JavaScript that runs inside the merchant's own page.

The promise of an accelerated checkout is that the shopper's details already exist somewhere else. A returning buyer skips address and card entry because the network remembers them from another store, which only works if enough stores join, so the value of the product to any single merchant depends on how many other merchants adopted it too. Adoption is not a vanity metric in this category. Adoption is the mechanism, and a list of the sites carrying the button is the closest available measure of whether such a network reached the size its pitch required.

As of October 2026 we detect Fast Checkout on 20 sites. The number carries a caveat about coverage and a larger one about meaning. Coverage first: a checkout script often loads only on cart and product pages, so how deeply a site was crawled decides whether we ever see it. The larger caveat is that a fingerprint proves code is present in a page, not that the payment path behind it still completes. Payment integrations are notoriously left in place after a merchant stops using them, the button quietly failing or hidden by styling while the script tag stays in the template.

Our record dates Fast Checkout to 2020 under a Proprietary license, into a segment where the established commerce platforms were already pushing their own wallets and one click flows at the same merchants. Reading the detected set with that context is the useful exercise. Domains still carrying the integration are a snapshot of who was persuaded to change something risky, which says something about their appetite for conversion experiments, their platform, and the scale at which a merchant starts caring about abandonment.

A per-domain lookup will confirm whether one shop you already know has the script. The dataset answers the questions that need the whole set at once: how widely a given checkout provider was adopted, which platforms and payment stacks sit beside it, whether the integration is spreading or draining away between snapshots, and which merchants would be candidates for anyone selling a replacement.