Google is shutting down the reCAPTCHA v1 API on March 31, 2018. Google is urging developers who are still using this API to update their websites to the reCAPTCHA v2 API as soon as possible. Google announced the deprecation of the version 1.0 API back in May 2016. Since this version is going to be retired, any calls to the API will not work after the March 31, 2018 retire date.
reCAPTCHA is a free service from Google that helps protect websites and applications from spam and abuse. The service uses machine learning and its advanced risk analysis engine to determine if users completing web forms, forum comments, and other user form actions are humans or bots. Developers have three choices when it comes to client side integration: reCAPTCHA V2, Invisible reCAPTCHA, and reCAPTCHA Android Library.
For more information about Google’s reCAPTCHA service, visit https://developers.google.com/recaptcha/.