Any tool to build tier 2/3 backlinks - forum commenting or social bookmarking links?

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If there's no option in Scrapebox for 0captcha, it may be possible to change your windows hosts file to spoof another service, like 2captcha, as long as 0captcha's API calls follow the same format. If you have a lot of credit with that service then it's probably just best to contact 0captcha support and ask for their advice, otherwise get an account with one of Scrapebox's supported services.

Yeah, Scrapebox works fine for SEO tasks. I send the captchas to Death By Captcha and some good rotating proxies.