quietmoneyExtensionpay
An open-source payments API for browser extensions: developers integrate it to collect subscriptions and one-time payments inside their extension (built on Stripe).
In 2020 Google One-line growth story, compiled by us from public sources; speculation is marked separately below.
Checkout visits over time
Checkout: checkout.stripe.com
1. Productwhat it sells, to whom, and how it charges
- Product
- An open-source payments API for browser extensions: developers integrate it to collect subscriptions and one-time payments inside their extension (built on Stripe).
- Users
- Indie developers who want to charge for Chrome / browser extensions
- Positioning
- A paywall built specifically for extensions: no monthly fee, only a cut per transaction, open source
- Pricing
- 5% per transaction, no monthly fee Billing: per item Free tier: yes Source: Existing
- Prices on site
- 5% per transaction, no monthly fee
- Team
- solo
- Sharing mechanics
- open source 'ExtensionPay is an open-source API to accept payments in browser extensions'; 'over 750 stars on Github'
“'ExtensionPay is an open-source API to accept payments in browser extensions'; 'over 750 stars on Github'”Quote from the site
2. Channelswhere new users come from and what the traffic looks like
New-user source: Viral (Built-in sharing). Direct 70.3%, social 22.3% (WhatsApp, YouTube, Reddit), search 4.5% including "how do you make money with chrome extensions" and "best paid chrome extensions". New users are classified as Viral (the open-source project spreads among developers). Referrals come from pokeathlon.com (4.55%) and gameforge.com, mostly extensions that use it for payments sending their paying users over. Taiwan has the highest share of traffic.
Last month's traffic sources
Top channel measured by Similarweb, others estimated by rank
Five-class attribution
| Attributable new users, last month | Share |
|---|---|
| 22% | |
| 75% | |
| Other | 3% |
Direct + brand search 75%. Direct and brand search count as viral only when the site shows sharing mechanics; the largest share wins, under 5% means Other.
Countries
| Country | Share of visits |
|---|---|
| Taiwan | 18.57% |
| United States | 17.35% |
| Honduras | 5.96% |
| Spain | 4.04% |
| India | 3.39% |
Language
English
Social sources
WhatsApp Webapp, YouTube, Reddit; Messaging: WhatsApp
Keywords
84 keywords · brand ~75% · organic 100% / paid 0%
| Similarweb top 5 keywords |
|---|
| extensionpay |
| extension pay |
| how do you make money with chrome extensions |
| most successful chrome extension, profit and downloads |
| best paid chrome extensions |
Referring sites
5 referring sites
| Site | Share of referrals |
|---|---|
| pokeathlon.com | 4.55% |
| gameforge.com | 1.84% |
Referrer categories
| Category | Share of referrals |
|---|---|
| Computers Electronics and Technology - Other | 8.73% |
| Games - Other | 4.85% |
| Marketplace | 4.78% |
| Graphics Multimedia and Web Design | 1.44% |
Site metrics (Similarweb, last month)
- Visits, last 3 months
- 403.1K (3 months)
- Visits MoM
- -8.73%
- Country rank
- United States #118049
- Category rank
- Computers Electronics and Technology - Other (US) #2268
- Bounce rate
- 84.47%
- Pages / visit
- 1.28
- Visit duration
- 00:00:34
- Industry
- Computers Electronics and Technology
- Top 3 channels
- Direct › Organic Social › Organic Search (top channel 70.29%)
3. Growth pathhow the first users arrived and what kept it growing
Classification
Basics
Timeline
Growth loop
Revenue and scale clues
Confidence and gaps
Other sites that started via “External event tailwind”
Similar sitessame category, also growing via Viral
FAQ
How many checkout visits does Extensionpay get per month?
About 12,894 last month (Similarweb estimate), #291 of 606; the month before was 13,515. Opening checkout is not paying, so this is not revenue.
Where do Extensionpay's new users come from?
New-user source: Viral (Built-in sharing). The site has invite or share mechanics, and direct plus brand search is the largest source Direct 70.3%, social 22.3% (WhatsApp, YouTube, Reddit), search 4.5% including "how do you make money with chrome extensions" and "best paid chrome extensions". New users are classified as Viral (the open-source project spreads among developers). Referrals come from pokeathlon.com (4.55%) and gameforge.com, mostly extensions that use it for payments sending their paying users over. Taiwan has the highest share of traffic.
How much does Extensionpay cost?
5% per transaction, no monthly fee
Dossier confidence: low. Parts 1 and 2 come from reading the site and Similarweb data; part 3 from public reporting, founder posts, Wayback snapshots, WHOIS and similar, with speculation marked.
The number: checkout visits is Similarweb's estimate of visits from the site to a checkout payment page; opening checkout is not paying, so this is not revenue. Small sites land on fixed buckets.
Data through last month. Page updated 2026-10-26.