The service allows a site to present a distorted image -- a captcha -- which a user must correctly interpret to proceed. Bots or automated scripts fail to give correct responses, which prevents them from submitting forms or using other website resources, typically with the intent of posting spam messages.
API methods support retrieval of captcha image or word, validating the user's response, and retrieving a new image or word if the response fails.
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So far, we don't have a record of any changes to this API