Serpstat’s tax entity is an address, not a merchant

Serpstat sells through its own entities, chiefly Promotions and Development Group Corp, based in Wilmington, Delaware, with Stripe and PayPal reduced to mere payment processors rather than merchants of record. Its own tax rule states only that liability “depends on payment info,” with no state, calculation basis, or nexus statement published anywhere.

Doubling your plan is the price of paying Serpstat by wire

Serpstat opens non-card billing only at its Team tier, a hundred US dollars a month; its Individual tier, at fifty dollars, excludes it entirely, leaving card as the only option below double the price. Annual billing saves up to twenty-seven percent, and the only named payment term anywhere is seven days for undisputed invoices; no net-30, purchase order, ACH, or W-9 is published, and the refund policy itself reads as contradictory across pages.

Ahrefs keeps the same kind of gate, just one tier further out

Ahrefs opens non-card billing only at Enterprise, one thousand four hundred ninety-nine US dollars a month on an annual commitment; its help center names invoice or wire as the options there, while its pricing page names only wire, with both versions left standing rather than reconciled. Below that tier, card is the only path, and purchase orders, net-30, ACH, and a W-9 are all absent.

One vendor’s own language count contradicts itself by page

Serpstat’s language count depends on which page answers: its pricing selector shows four entries, English, Spanish, Russian, and Ukrainian, while its help-center navigation shows only two, English and Ukrainian; its own “Settings” article documents no language count at all. Ahrefs ships fifteen interface languages, English listed as a single entry with no US or UK distinction drawn.

The backlink index disagrees with itself by an order of magnitude

Serpstat states its backlink index at one point one trillion links on three separate pages, and five hundred twenty-nine billion on its own homepage — two figures that differ by roughly a factor of two, on pages the vendor has not reconciled, with no built-in disavow tool published either. Ahrefs states thirty-five trillion live links, refreshed every fifteen to thirty minutes, and likewise offers no built-in disavow tool.

The entry prices sit twenty-one US dollars apart, before either refund clause applies

Serpstat’s Individual tier costs fifty US dollars a month: a hundred daily searches, five projects, no API access, and no second user. Ahrefs’s Starter tier costs twenty-nine dollars a month: two hundred credits, two hundred fifty rows per report, no export, and no additional users.