Five providers that check an address will accept mail before your sending tool bills you for the attempt and your domain absorbs the bounce. The cheapest insurance in this directory, and the one most often bought twice by accident.
Verification costs a fraction of a cent and protects a sending domain that takes months to rebuild. That makes it the one place in this stack where the cheap option is also the correct one, and where skipping the step to save money is straightforwardly a bad trade.
The trap is not the price, it is buying it twice. Findymail and Prospeo verify at the moment they find an address. FullEnrich bundles verification free with enrichment. Pushing their output through a separate verifier again is pure waste, and it happens constantly because verification gets bolted onto the end of a pipeline rather than routed per source.
Get this right and you halve the line. In the waterfall stack on this site, verification is 35% of the bill even after routing it properly. Run it on everything indiscriminately and it becomes most of what you spend.
Filtered to the 5 providers that serve this stage. Billing model is the filter worth starting with, because it decides whether a quiet month costs you anything.
Reviewed in full, with each rate card read off the vendor's own page: LeadMagic, Hunter and FullEnrich.
The clearest rate card in this directory. Every operation has a stated credit cost, credits come off only when a lookup succeeds, and search itself spends nothing on plans that include it. The MCP server ships on every tier, including the cheapest.
Findymail verifies at the moment it finds, so you are not paying twice for the same address. It is the only provider here that puts a number on deliverability and refunds against it: above a 5% bounce rate, the credits come back.
Hunter has been the default first API in this category for a decade, and the documentation shows it. Coverage is thinner than the newer waterfall tools, but nothing else here is as fast to get a working call out of.
FullEnrich runs the same waterfall logic Clay does, but as a single API call with a single bill. If all you need is the waterfall and not the spreadsheet around it, this is that half of the trade on its own.
One of the few providers here you can use properly without a subscription. $39 buys 2,000 validations that never expire, which makes it the natural gate in front of a sending tool that charges you for every send whether it lands or not.
In the order they cost you money.
Only addresses from providers that do not verify at find time need a separate check. In a four-provider waterfall that is usually one source out of four, which turns a whole-list verification cost into a quarter of one.
A meaningful share of any list comes back as unknown because the receiving server accepts everything. ZeroBounce charges nothing for those, which matters more than the headline rate on a catch-all-heavy list. Check this before you compare per-check prices.
Verification volume is lumpy. It spikes when you build a list and sits at zero for weeks after. A provider with a monthly subscription charges the same in a quiet month, which is why pay as you go usually wins here despite a higher unit price.
Most providers return a score. One refunds your credits if your bounce rate exceeds 5%. A number you can hold a vendor to is worth more than a number that describes their own confidence in themselves.
The same providers, seen three other ways: head to head on the compare hub, by the reason teams leave on the alternatives hub, and wired together with the cost run end to end on the stacks hub.
Every pairing in this stage, with the arithmetic done on a worked volume: Apollo vs LeadMagic, LeadMagic vs Findymail, Findymail vs Hunter and ZeroBounce vs LeadMagic.
Teams leaving one of these have somewhere to go: LeadMagic, Findymail and Hunter.
Teams leaving one of these have somewhere to go: ZeroBounce and FullEnrich.
A seat license with 30,000 credits against a published per-operation rate card.
Compare them →A published per-operation rate card against a refundable bounce guarantee.
Compare them →A refundable bounce guarantee against the best-documented starter in the category.
Compare them →Four providers chained cheapest-first, each taking only what the last one missed, then verification routed per source.
See the stack →Form submission to enriched, verified, routed and sequenced in under a minute, with no human in the path.
See the stack →A clear rate card and no free tier. The second half is what sends people looking.
See the alternatives →A bounce guarantee, EMEA coverage, and no mobile numbers in the EU. That last one rules it out for some teams entirely.
See the alternatives →The best documentation in the category, attached to the narrowest dataset.
See the alternatives →Verification with no monthly floor. The alternatives are mostly "do not buy this separately".
See the alternatives →We run the bake-off on your own list, pick the order, and build the pipeline behind it: routing, credit ceilings and the write-back that puts the result in front of a rep the same day.
Worked with 300+ companies. A senior operator runs your account.
5, each with its own review carrying the price, the rate limit and the auth method read from the vendor's own pages.
Hunter and ZeroBounce. What each free tier includes differs a lot, so the review says what you actually get.
Per unit, ZeroBounce at $0.019 per validation. The cheapest unit is not the cheapest bill: a monthly floor and a charge on a failed lookup both change the answer, and each review states both.
Every one of them meters you, so the unit cost is the comparable figure and the monthly floor is what you actually pay at low volume. Both are on each review.
LeadMagic, Hunter, FullEnrich and ZeroBounce. The ones the directory reviews live on the MCP page with the connect details.
