Start with the numbers you can check: BounceZero verification costs $0.0030 per email at the $6 entry pack and falls to $0.0022 per email on the 1,000,000-credit pack - no subscription, no minimum, credits never expire. But “cheapest” means two different things depending on how you send, and on raw per-email rates a couple of competitors publish lower numbers at certain volumes. This guide lays out both definitions, cites competitor prices only where we could verify them, and shows why cost per deliverable email is the number that actually hits your budget.
Most “cheapest email verifier” pages quietly conflate three different questions. We split them apart, because the right answer changes depending on which one you’re asking.
The least money to get one real list cleaned. BounceZero’s $6 pack (2,000 verifications) is the lowest published entry price on this page - several competitors only quote small volumes through on-site calculators, so check their sites for your exact figure. Subscription products can’t compete here: a $99/month minimum makes a 2,000-address job cost $99.
The lowest rate once you’re buying six or seven figures of credits. BounceZero reaches $0.0022/email at 1M credits. Some competitors publish lower per-email rates at certain volumes - we cite the ones we could verify below, because pretending otherwise would be marketing, not analysis.
The number that actually matters: what you paid divided by the addresses you can safely send to. Unresolved results, catch-all credit multipliers, and missed dead addresses all push this up without touching the headline rate. Covered in its own section below.
These are the real, current pack prices - the same table you’ll see at checkout. One credit verifies one address, catch-all confidence scoring included, no multipliers. No subscription, no monthly minimum, credits never expire, and every account gets 100 free verifications per month.
| Pack | Credits | Price | Per email |
|---|---|---|---|
| Starter | 2,000 | $6 | $0.0030 |
| Growth | 5,000 | $15 | $0.0030 |
| Professional | 10,000 | $30 | $0.0030 |
| Business | 50,000 | $140 | $0.0028 |
| Scale | 100,000 | $280 | $0.0028 |
| Pro Scale | 250,000 | $650 | $0.0026 |
| Enterprise | 500,000 | $1,200 | $0.0024 |
| Ultimate | 1,000,000 | $2,200 | $0.0022 |
We only print a competitor number when we could read it on their public pricing page, with the date we checked. Many verifiers quote prices exclusively through on-site calculators - for those, the honest entry is “quoted per volume,” not a number we made up. Prices change; always confirm on the vendor’s site before buying.
| Service | Cheapest published figure | Per email | Notes |
|---|---|---|---|
| BounceZero | $6 for 2,000 credits - full table above | $0.0030 down to $0.0022 at 1M | No subscription, no minimum, credits never expire, 100 free/month |
| MillionVerifier | 50,000 verifications for $89 (verified July 2026 - check current) | $0.00178 at 50,000 (their published figure) | Other volumes quoted via on-site calculator; credits never expire; 100 free signup credits |
| DeBounce | “From $0.00045 per check” headline rate (verified July 2026 - check current) | Tier prices quoted via on-site calculator | Catch-all validation billed at 10 credits per check per their pricing page; credits never expire |
| Emailable | 5,000 credits for $38 one-time, or $32.30/month on subscription (verified July 2026 - check current) | $0.0076 at 5,000 | Larger tiers priced via on-site selector; 250 free signup credits; credits never expire |
| ZeroBounce | ONE subscription from $99/month with a 10,000-credit minimum (verified July 2026 - check current) | Pay-as-you-go quoted per volume (zerobounce.net) | 100 free credits/month; credits never expire; see our ZeroBounce pricing guide |
| NeverBounce | Quoted per volume (see neverbounce.com) | Quoted per volume | We couldn’t verify a public figure at the time of writing |
| Kickbox | Quoted per volume (see kickbox.com) | Quoted per volume | We couldn’t verify a public figure at the time of writing |
Being straight about that table: at 50,000 emails, MillionVerifier’s published $89 beats BounceZero’s $140 on raw per-email price, and DeBounce’s headline rate is lower still at whatever volume unlocks it. We’re not going to pretend otherwise. Where BounceZero wins on pure price is the entry point - $6 with no floor - and the fact that one credit always equals one address, catch-all included. Whether the raw-rate gap survives contact with a real list is what the next section is about.
You don’t buy verification to process rows - you buy it to end up with addresses you can safely send to. That makes the real unit of cost price paid ÷ addresses you can act on, and three things quietly move it:
1. Unresolved results. Every verifier returns some share of “unknown” or “risky” verdicts. You paid for those checks, but you can’t confidently mail the addresses - so a low headline rate with a high unresolved share can cost more per usable answer than a pricier tool that resolves more of the list. BounceZero’s 5-stage pipeline exists precisely to shrink that unresolved share, and its catch-all confidence scoring turns the hardest category - catch-all domains - into a graded confidence signal instead of a flat “risky” bucket.
2. Credit multipliers. Read the meter, not just the rate. DeBounce, for example, publishes catch-all validation at 10 credits per check (verified July 2026) - entirely their right, and at least it’s disclosed, but on a catch-all-heavy B2B list the effective per-address cost can be a multiple of the headline figure. BounceZero bills every address, catch-all or not, at exactly one credit.
3. Missed dead addresses. The most expensive outcome is a verifier marking a dead mailbox “valid.” Those come back as hard bounces, and mailbox providers read bounce spikes as a list-hygiene failure - throttled delivery and junk-folder placement on the sends that follow. A tool that saves you $50 on the invoice and costs you inbox placement on a campaign wasn’t the cheap option. That’s why BounceZero only calls an address valid when the pipeline has actual evidence for it, rather than defaulting borderline cases to the answer customers want to hear.
Here’s the arithmetic in the abstract - illustrative numbers, not measured rates of any named tool:
| Scenario (10,000-address list, $30 spend) | Unresolved share | Usable answers | Real cost per usable answer |
|---|---|---|---|
| Verifier resolves most of the list | 3% | 9,700 | $0.0031 |
| Verifier punts on catch-alls and edge cases | 20% | 8,000 | $0.0038 |
Same spend, same list - a 22% difference in what each usable answer cost, before counting the downstream price of any bounces. The practical takeaway: run a few hundred addresses from your own list through the free tiers of your shortlist and compare how much of it each tool actually resolves. Every account here gives you free credits to do exactly that; BounceZero’s 100 free verifications refill monthly.
If you verify millions of addresses a month and per-email price is the only axis, get quotes from the calculator-based vendors above at your exact volume and compare against BounceZero’s $0.0022 at 1M credits. Just run the deliverable-email test first - and check each vendor’s credit rules for catch-all and unknown results before trusting the headline rate.
If your volume is small, seasonal, or client-by-client, BounceZero is the cheapest published way in: $6 for 2,000, no subscription floor, credits that never expire, 100 free verifications every month, one credit per address with catch-all confidence scoring included, and EU data residency if your compliance team asks where the processing happens.
It depends on which “cheapest” you mean. The lowest published entry price on this page is BounceZero at $6 for 2,000 verifications with no subscription. On raw per-email price at certain volumes, some competitors publish lower rates - MillionVerifier, for example, lists 50,000 verifications for $89 ($0.00178 per email, verified July 2026). The honest answer is to compare prices at your actual volume and per deliverable email, not just the headline rate.
$0.0030 per email on the smaller packs ($6 for 2,000 up to $30 for 10,000), falling to $0.0028 at 50,000-100,000, $0.0026 at 250,000, $0.0024 at 500,000, and $0.0022 per email on the 1,000,000-credit pack ($2,200). There is no subscription, no minimum, credits never expire, and every account gets 100 free verifications per month.
No. Three things change the real cost: subscription floors or minimums that force you to buy more than you need, credit multipliers (some tools bill catch-all validation at several credits per address - DeBounce publishes 10 credits per catch-all check), and the share of results that come back unresolved. You pay per address processed, but you can only use the addresses that get a clear answer.
It varies by tool, so check each pricing page. BounceZero has no subscription, no minimum, and credits never expire. Several competitors also state that credits never expire, including ZeroBounce, MillionVerifier, DeBounce, and Emailable - non-expiring credits are common in this market, so treat them as table stakes rather than a differentiator.
Most verifiers include some free credits. BounceZero gives every account 100 free verifications per month, ongoing. At the time of writing, ZeroBounce also offers 100 free monthly credits, and MillionVerifier, DeBounce, and Emailable list free signup credits on their pricing pages. Free tiers are enough to test accuracy on a sample before paying anyone.
BounceZero packs start at $6 for 2,000 verifications and reach $0.0022 per email at volume. No subscription, no minimum, credits never expire - and every account gets 100 free verifications per month to test accuracy on your own list first. No card required to start.
Ayoub built BounceZero's 5-stage validation pipeline, its dedicated BGP-announced IP infrastructure, and the Patroni HA PostgreSQL cluster behind every verification. Previously built high-volume email delivery infrastructure. Trained at 1337 Benguerir (École 42 network, 2019). Open-source: bgp_analyzer.