Serpstat

Serpstat is an all-in-one SEO and PPC platform covering keyword research, competitor analysis, rank tracking, site audits, and backlink data. It launched in 2013 and has grown into a widely used alternative to the larger SEO suites, particularly among agencies watching budget.

Paid plans start at around $59 per month and scale through Standard and Advanced tiers to roughly $239 per month, priced by query limits, projects, and users. A limited free tier lets you test the data before committing.

The affiliate program pays up to 30% recurring commission on subscription sales, and commissions are lifetime — you keep earning from every payment a referred customer makes for as long as they stay subscribed. The rate is tiered, starting lower and climbing with performance.

The tracking cookie is 30 days. Payouts require a balance above $50 and can be taken via PayPal or bank transfer depending on your region, with commissions released on a regular monthly cycle.