EarnedBacklinks

Buying backlinks costs $100 to $400 a link. EarnedBacklinks gets them the slow, honest way: by pitching the people who write about your niche. Its agent finds real articles that should mention your product, proposes the line to add, and emails the author from your own second-domain mailbox once you approve. Your first 20 pitches wait for your OK; then it runs on its own, up to 30 a day, with two follow-ups and reply drafts you approve. It never pays for links. If an editor asks for a guest post, it writes it and you sign it.

Built by a founder who needed links for his own two apps: 2,326 first emails led to links from 33 sites, about one per 70 emails. $49 a month, one site, cancel any time.