Authentication and identification to the EasyPost API is done by providing an API Key on every request as your Basic Auth username (no password is required). EasyPost also requires that all communication with the API is secured using TLS. Requests made over HTTP or without a proper API Key will fail.
EasyPost provides two types of API Key: Test and Production. You can test all EasyPost functionality using your Test key, for free, immediately after signing up.
You can manage your API Keys from your account.