Two pricing models dominate this market. Subscriptions charge you a flat monthly fee with a credit allowance that resets whether you used it or not. Credit packs charge per email, once. The catch is that list cleaning is bursty work: you scrub 25,000 addresses before a campaign, then verify almost nothing for six weeks. On a subscription you pay for those six quiet weeks anyway, and most providers quietly delete the credits you already paid for. That is why Verifox only sells pay-as-you-go credits. One credit buys one pass through the full 9-point email verification engine, and an unused credit is still yours in 2030.
What does a credit cost? It depends on volume, and the pay-as-you-go packs above answer in your own currency. Packs run from 1,000 to 1,000,000 verifications, and the per-email rate drops as the pack grows, up to 79% off the base rate at the top tier. One balance covers everything: single checks, bulk CSV uploads, and the REST API. The same credits also power the email finder when you need to fill gaps in a prospect list, and pair naturally with the FoxGuard form-protection widget that stops bad addresses from entering your database in the first place.
One warning before you compare prices: the per-email rate is the small number. The big number is what bad verdicts cost you. A tool at 98% accuracy leaves 2,000 bad addresses in a 100,000-email list; at 99.99%, that drops to 10. And since catch-all domains cover 20 to 40% of B2B lists, a cheap tool that returns “unknown” on all of them is charging you for a shrug. Run your hardest addresses through the free email checker first, then price the tool that actually got them right.