The site has an API for reading posts [0]. It works (worked?) quite well. For making posts, you'd need to write your own functionality that forwards the CAPTCHA

The site has an API for reading posts [0]. It works (worked?) quite well. For making posts, you'd need to write your own functionality that forwards the CAPTCHA and post timers. [0]: https://github.com/4chan/4chan-API https://github.com/4chan/4chan-API