Cotter - One-click phone number login and checkout

Accept Crypto - Find out if a company or website accepts Cryptocurrency.

Amazon Cognito - Amazon Cognito lets you add user sign-up, sign-in, and access control to your web and mobile apps quickly and easily. It scales to millions of users and supports sign-in with social identity providers and enterprise identity providers via SAML 2.0.

Munt - Accept multiple cryptocurrencies with just 5 lines of code

Auth0 - Auth0 is a program for people to get authentication and authorization services for their own business use.

Crypto Accepted - Discover businesses that accept cryptocurrencies