Do Bouncer credits expire?

No. Bouncer's pricing page says email verification credits never expire. InboxSure does not use credits.

Does Bouncer charge for unknown results?

Bouncer says it does not charge for duplicates or unknown results. InboxSure Pro has no per-email charge, so no result ever costs extra.

How do they handle catch-all addresses?

Both report catch-all (accept-all) addresses as risky rather than deliverable. InboxSure also flags them as catch-all so you can segment them in your download.

Does InboxSure have an API like Bouncer?

An API is coming soon on the Pro plan. Today InboxSure works by uploading a CSV or Excel file and downloading the results.

Bouncer alternative

InboxSure vs Bouncer

Q: Is InboxSure cheaper than Bouncer?

At steady volume, yes. Bouncer charges $60 for 10,000 credits and $400 for 100,000. InboxSure Pro is a flat $49 a month for unlimited lists of up to 10,000 addresses. For a single small list, Bouncer's $8 pack of 1,000 credits costs less. Prices checked on October 28, 2026.

Bouncer sells low-cost credits that never expire, with an API and EU hosting. InboxSure charges one flat monthly price with no credits.

Bouncer details checked against their public pages on October 28, 2026. Sources

Bouncer is an EU-based email verification service. You buy credits from 1,000 at a time, they never expire, and unknown results and duplicates are not charged. It offers an API and a separate deliverability kit for inbox placement and blocklist tests.

InboxSure is a dedicated verifier with no credits. Pro is a flat $49 a month for unlimited lists of up to 10,000 addresses, with syntax, DNS/MX and SMTP mailbox checks and catch-all, disposable and role-based detection.

Bouncer is one of the cheaper per-email options, so the honest answer depends on how much and how often you verify.

At a glance

	InboxSure	Bouncer
Pricing model	Flat monthly plan, no credits	Credit packs, or the same credits monthly
Smallest purchase	Pro, $49/month	$8 for 1,000 credits
10,000 verifications	$49/month, as many lists as you need	$60
100,000 verifications	$49/month, in lists of up to 10,000	$400
Free plan	Unlimited lists of up to 50 addresses	100 free credits to start
Credit expiry	No credits	Credits never expire
Unknown results	No credits to lose	Not charged
Catch-all handling	Detected and flagged as Risky	Reported as Risky (accept-all)
API	Coming soon on Pro	Available

What it costs in practice

Bouncer's published prices are $8 for 1,000 credits, $60 for 10,000 and $400 for 100,000, with 1 credit per address.

Verifying 10,000 addresses a month costs $60 a month on Bouncer and $49 on InboxSure Pro. At 50,000 a month, Bouncer's packs cost several times more, while InboxSure Pro stays at $49.

See the full plan details on the InboxSure pricing page.

Where InboxSure is better

Cheaper at high volume. 100,000 verifications cost $400 on Bouncer. On InboxSure Pro, ten lists of 10,000 in a month cost $49.
Cheaper every month you clean. If you verify 10,000 or more addresses every month, InboxSure's $49 is below Bouncer's $60 for a 10,000-credit pack, and the gap grows with volume.
Free plan that keeps working. Bouncer gives 100 credits to start. InboxSure's free plan verifies lists of up to 50 addresses as often as you like.
Free deliverability tools. Check SPF, DMARC and MX records with InboxSure's free tools, no account needed.

Where Bouncer is better

Small or occasional lists. 1,000 verifications for $8 with credits that never expire is hard to beat if you only verify now and then.
API today. Bouncer has an email verification API now. InboxSure's API for Pro is coming soon.
EU hosting. Bouncer says it is hosted in the EU, which some teams prefer for data residency.
Very large single files. Bouncer sells packs up to 1,000,000 credits. InboxSure Pro handles up to 10,000 addresses per list.

Which should you choose?

Choose Bouncer if you verify small lists occasionally, need an API today, or want EU-hosted processing.

Choose InboxSure if you verify 10,000 or more addresses a month and want one flat price instead of buying packs.

Either way, you can see how InboxSure handles your own data for free: lists of up to 50 addresses cost nothing, and results come back as Deliverable, Risky, Undeliverable or Unknown with the reason. InboxSure reports Unknown when a mail server will not give a clear answer, rather than guessing.