Extensionpay
Open-source API letting developers accept subscription and one-time payments in browser extensions
Overview
Extensionpay (extensionpay.com): Open-source API letting developers accept subscription and one-time payments in browser extensions. Category on TopCheckouts: Developer tools.
In September 2026, Similarweb estimates about 12,894 visits went from Extensionpay to a checkout payment page — #291 of the 607 sites we track. That is 9% up from the April–June monthly average of 11,800.
Total website visits that month were about 126,312 (Similarweb 3-month total, split by month-over-month change). Roughly 10.2 of every 100 visits reached the checkout page.
Largest September traffic sources: direct 70%, social 22%, search 4%. (Top channel measured; others estimated by rank.)
New users mostly come from the product spreading itself: the site shows open source, and direct plus brand search is about 75%, plus shares via WhatsApp. Most new users are brought in by existing ones.
Pricing: 5% per transaction, no monthly fee.
September traffic sources
Similarweb top channel measured, others estimated by rank
Channel details
FAQ
How many checkout visits does Extensionpay get per month?
In September 2026, Similarweb estimates about 12,894 visits went from Extensionpay to a checkout payment page — #291 of the 607 sites we track. That is 9% up from the April–June monthly average of 11,800.
Where do Extensionpay's new users come from?
New users mostly come from the product spreading itself: the site shows open source, and direct plus brand search is about 75%, plus shares via WhatsApp. Most new users are brought in by existing ones.
How much does Extensionpay cost?
Pricing: 5% per transaction, no monthly fee.
Similar sites
About the data
Checkout visits are Similarweb's estimate of visits from this site to a checkout payment page; opening checkout is not paying, so this is not revenue. See the methodology for how website visits and source mix are computed. Updated 2026-10-21.