And is there a refund for incorrectly recognized captchas?
Price is influenced by server workload from number of captchas and number of workers online. The price is the same for all webmasters at the same moment and ranges from 0,5$ to 1$. You can check current rate by API or at 2captcha API. Webmaster can adjust his maximum rate per captcha. When the rate is higher than set by the webmaster captchas wouldn't be uploaded and webmaster will receive :ERROR_NO_SLOT_AVAILABLE:And is there a refund for incorrectly recognized captchas?