Why we publish our pricing and our methods

Most email verifiers sell on the same promises: high accuracy, clean lists, a protected sender reputation. A promise is hard to test before you pay. A price, a billing rule and a method are easy to test, so ZapBounce publishes all three.

Start with the price. ZapBounce costs $5 for 1,000 checks, $25 for 10,000, $139 for 100,000 and $949 for a million. There's no minimum and no card for the free tier, which gives every account 100 checks a month.

Billing is just as plain. Valid, invalid and catch_all cost one credit each. Unknown results, duplicates in a batch and syntax failures cost nothing. Credits never expire, while Kickbox and Hunter both expire credits one year after purchase (both read on 24 September 2026).

As for the method, we run our own SMTP check on port 25 and close the connection before any message is sent. Every result carries the server's literal reply code, so you can audit how we read it.

Start with your real cost: multiply your list size by the published rate, then take out the duplicates and the unknowns. That figure is what your invoice will show.

Next, check your own coverage by running the 100 free checks on a sample of your list. Your report shows what share got a definite answer, with the count for each result beside it, so you judge us on your data.

Then check our reading of any row: its smtp_code field shows the server's own reply. If a 550 comes back invalid and a 250 on an accept-all domain comes back catch_all, you can see that we read it right.

Finally, check what happens to your data. Uploads and results are kept for 30 days by default, and you can set that from zero to 90 days per API key. We never sell or share an uploaded address.