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VerifyKit

The simplest way to verify your users·verifykit.io

VerifyKit is an email validation and email OTP (one-time password) API for developers, combining real SMTP mailbox verification with two-factor authentication behind a single API key. It checks email syntax, MX records, SMTP mailbox existence, disposable/role-based/free-provider status, and typo correction, and can send and verify 6-digit OTP codes via email. The service is edge-deployed for sub-300ms global response times and offers SDKs for Node.js, TypeScript, PHP, Go, Python, and Rust.

What it's for

Block disposable/temporary emails at signup to reduce free-trial abuseCatch typos in user-entered emails and suggest the correct spelling before submissionClean marketing lists before sending campaigns to reduce bounce rate and protect sender reputationAdd email-based two-factor authentication without paying for SMSVerify email addresses in bulk for sales prospecting, list hygiene, or compliance audits

Features 19

Bulk email validation with automatic deduplication
Catch-all domain detection
Disposable email detection
DMARC record checker
Edge-deployed API with sub-300ms global response times
Email OTP 2FA (6-digit codes, SHA-256 hashed, 10-minute TTL)
Email quality scoring
Free duplicate removal
Free email provider detection
Interactive API playground
Multiple API keys (Pro and above)
MX record lookup
Real SMTP mailbox verification
Role-based email detection
SPF record checker
Typo correction (e.g., gmial.com → gmail.com)
Unlimited API calls (only valid checks count toward quota)
Validation history dashboard
Webhooks & callbacks

At a glance

free trialAPI

TypeWeb app

DeploymentCloud

PlatformsWeb

Fordevelopers, indie devs and side projects, small teams shipping fast, production SaaS and agencies, high-volume products

Integrations

Stripe

Complianceself-reported

GDPRPSD2SCAAPPNIST 800-63

Resources

Docs

Pricing

Prices shown are the full listed monthly rates; a temporary 20% discount applies to the first 3 months for new signups. No annual billing discount is currently offered. A free API tier was discontinued; a separate free single-email verification tool remains available without signup. Volumes beyond the Unlimited plan's 5M/month fair-use cap require contacting support for enterprise pricing.

Starter$9/mo

Effective rate shown on page: $0.0018 per validation at full quota.

5,000 validations / month

Growth$19/mo

Effective rate shown on page: $0.0013 per validation at full quota.

15,000 validations / month

Pro$49/mo

Effective rate shown on page: $0.001 per validation at full quota.

50,000 validations / month

Unlimited$249/mo

Described as unique in the market — flat fee with no per-validation cost up to the fair-use cap. Higher volumes require enterprise pricing via email contact.

Fair-use cap of 5,000,000 validations / month; no per-validation charge

20% off the first 3 months for new customers (promotional window shown: May 26, 2026 – Aug 26, 2026); full listed price applies afterward.