BrowserBill makes it easy to implement billing for your Chrome extension. It allows you to accept one-time and recurring payments from your users.
ExtensionPay Alternatives
ExtensionPay is described as 'Open-source API to accept payments for browser extensions. It supports:' and is an app in the development category. There are 1 alternatives to ExtensionPay for Web-based. The best ExtensionPay alternative is BrowserBill.
BrowserBill's API and code is extremely similar to that of ExensionPay. And they both use Stripe. Nearly indistinguishable.