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MillionVerifier

Keep your email lists clean

Data & Discovery
For AI agents
APICapable readiness
About

What is MillionVerifier

MillionVerifier checks email addresses against validity, disposability, and activity status — processing uploaded TXT, CSV, or XLSX files in bulk or verifying addresses one at a time via API at the moment of capture. It's built for marketing teams, RevOps, and SDR/BDR functions at mid-market and enterprise companies that need to keep bounce rates down across large contact databases. The standout capability is EverClean, an automated list-cleaning service that continuously monitors and re-verifies lists without manual intervention — useful for teams whose databases decay over time. White-labeling support also makes it a fit for agencies or resellers who want to offer verification under their own brand. Where it falls short: native integrations are thin, with only GetResponse mentioned publicly, so teams running HubSpot, Salesforce, or other CRMs will need to wire things up through the API themselves.

Data & Discovery
Capabilities

Key features

Email verification

validates whether an address is deliverable

Outbound webhooks

event-driven integrations

Our verdict

Vanderbuild take

For Marketing, RevOps, and SDR/BDR teams that live and die by deliverability, MillionVerifier is a focused, no-frills email verification tool that does one thing and does it consistently at volume. The REST API is available and well-documented enough that you can wrap it into your own MCP layer or agentic enrichment pipeline without much friction — it's rated Capable on agentic readiness, so expect clean integration work rather than out-of-the-box agent support. Pricing is usage-based and scales to enterprise volumes, but the EverClean automated tier requires a sales conversation, so budget for procurement involvement if that's the feature you actually need. The honest limitation here is integration depth — if you're expecting native CRM connectors, you'll be disappointed; GetResponse is the only named integration, and everything else runs through the API or manual file uploads.

Mateusz Sekta
Founder, vanderbuild
Learn more

Our Resources

The wedge

Agentic stack profile

API
REST

Programmatic access available.

REST API — straightforward to call from any agent or workflow tool. Rate limits and auth vary by plan.

API docs →
Agentic readiness
Capable

Solid API access — wraps cleanly for agent use.

Solid REST or SDK access. No MCP server yet, but easy to wrap in custom agent tooling. Most modern SaaS tools land here.

Stack role
Verifier

Where this tool slots into an agentic pipeline.

Plays the role of Verifier in an agentic pipeline. Use it to validate emails or phones before an agent sends or dials.

Compare

MillionVerifier alternatives

Tools that solve a similar problem — compared at a glance.

MillionVerifier(this tool)
Pricing
Custom
Budget
$$$$
Best for
Marketing, RevOps
Readiness
Capable
API
REST
BriteVerify
Pricing
Custom
Budget
$$$$
Best for
RevOps, Marketing
Readiness
Capable
API
REST
Clearout
Pricing
Custom
Budget
$$$$
Best for
SDR / BDR, RevOps
Readiness
Capable
API
REST
Answers

Frequently asked questions

Does MillionVerifier have a public API?

Yes — MillionVerifier ships a REST API. Docs: https://developer.millionverifier.com/.

How much does MillionVerifier cost?

MillionVerifier: pricing is custom, expect enterprise tier ($$$$) spend. Full pricing page: https://www.millionverifier.com/why-millionverifier/best-email-verification-prices.

Who is MillionVerifier best for?

MillionVerifier is built for Marketing, RevOps, SDR / BDR. Fits Enterprise, Mid-market (50-500)-sized teams.

How well does MillionVerifier fit an agentic sales stack?

Tier: Capable. Solid public API, no MCP yet — straightforward to wrap in your own agent tooling.