Weekend Projects Easy 8,100/mo

Email Validation API

Verify email addresses are real, deliverable, and not disposable. Reduce bounce rates, block fake signups, and clean your email lists with a simple API call.

APIEmail
MRR Potential
$5K–$15K
Time to MVP
1 weekend
Search Volume
8,100/mo
Market Size
$1.2B

The Problem

20-30% of email addresses on signup forms are invalid. Sending to invalid emails hurts sender reputation. Disposable email services (Guerrilla Mail, 10MinuteMail) enable abuse. Email list decay is 22% annually. Existing validation APIs charge $0.01+ per validation — expensive at scale.

The Solution

Email validation API checking syntax, MX records, SMTP verification, and disposable email detection — ensuring every email in your system is real, deliverable, and from a legitimate provider.

Target Audience

SaaS companies preventing fake signups, email marketers cleaning mailing lists, and e-commerce stores validating customer emails at checkout

Key Features

1
Syntax validation catching formatting errors before API calls
2
MX record checking verifying the domain accepts email
3
SMTP verification confirming the mailbox exists (without sending)
4
Disposable email detection blocking 10K+ temporary email providers
5
Bulk validation for cleaning existing email lists via CSV upload
6
Real-time API for validating emails at point of capture

Market Opportunity

Market Size
$1.2B — Email deliverability and data quality
Monthly Searches
8,100/mo
MRR Potential
$5K–$15K
Why Now?

Email bounce rates directly impact sender reputation. Disposable email abuse is growing. Email list hygiene is essential for deliverability. Real-time validation prevents bad data at source. Simple APIs win developer adoption.

Revenue Model

Free: 100 validations/day. Pro: $9/mo (5K/day + bulk). Business: $29/mo (50K/day + webhook). Enterprise: $79/mo (500K/day). Annual: 20% discount.

Competitive Landscape

ZeroBounce

Email validation. $16+/mo, established, comprehensive

NeverBounce

Email verification. $8+/1K emails, good accuracy

Hunter.io

Email finder + verifier. $49+/mo, finder-focused

Regex validation only

Catches syntax errors only, no deliverability check, misses everything

Recommended Tech Stack

Next.jsNode.jsDNS/SMTP librariesDisposable email databaseVercelStripe

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