useragent

/useragent returns the browser User-Agent we currently recommend, as plain text. It needs no clientKey and is free. The userAgent field of hCaptcha tasks accepts only this value, and using it when you visit the target site also helps tokens pass.

GEThttps://api.yescaptcha.com/useragentGlobal endpointCopy

GEThttps://cn.yescaptcha.com/useragentChina endpointCopy

Example

curl -s https://api.yescaptcha.com/useragent

Response (value on 2026-10-15; it changes with browser releases):

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/155.0.0.0 Safari/537.36

• The value changes over time. Don’t hard-code it; fetch it when your program starts.
• If a result contains a userAgent, submit the token with that value.