Cotter provides one-tap passwordless login for websites and applications. The Cotter User API enables developers to add users to the service, and retrieve user (or list of users) identifier, such as phone number or email address. The service authenticates users based on ownership of a device, and allows instant login using a magic link or a verification code sent via email, SMS, or WhatsApp.
Ten APIs have been added to the ProgrammableWeb directory in categories including Transportation, Museums, and Location. Highlights include an API that provides estimates about C02 emissions and an API for adding users to a waiting list. Here's a rundown of the latest additions.