To solve for these more complex images, we will make use of a CAPTCHA solving service. There are many CAPTCHA solving services available, such as 2captcha.com and https://de-captcher.com/, and the rates vary from $0.50 to $2 for around 1000 CAPTCHAs. When a CAPTCHA image is passed to a CAPTCHA-solving API, a person will then manually examine the image and provide the parsed text in an HTTP response, typically within 30 seconds.
For the examples in this section, we will use the service at 9kw.eu, which does not provide the cheapest per CAPTCHA rate or the best designed API. However, on the positive side, it is possible to use the API without spending money. This is because 9kw.eu allows users to manually solve CAPTCHAs to build up credit, which can then be spent on testing the API with our own CAPTCHAs.