Weekend Projects Easy 3,600/mo

Disposable Email Detector

API to check if an email is from a temporary/disposable provider. Block fake signups from Guerrilla Mail, Temp Mail, and 10,000+ throwaway email services.

SecurityAPI
MRR Potential
$2K–$8K
Time to MVP
1 weekend
Search Volume
3,600/mo
Market Size
$300M

The Problem

Disposable email services let users create unlimited accounts. Free tier abuse costs SaaS companies thousands per year. 10+ new disposable providers launch monthly. Existing blocklists are outdated.

The Solution

Real-time disposable email detection API checking against 10K+ known throwaway providers — with daily updates, custom allowlists, and zero false positives on legitimate domains.

Target Audience

SaaS companies blocking free-tier abuse, e-commerce stores preventing coupon fraud, and lead generation teams filtering low-quality signups

Key Features

1
Detection of 10K+ disposable and temporary email providers
2
Daily database updates adding newly discovered providers
3
Sub-5ms API response time for real-time form validation
4
Custom allowlist for domains you want to always accept
5
Risk scoring: disposable, suspicious, or legitimate classification
6
Webhook notifications when new disposable providers are detected

Market Opportunity

Market Size
$300M — Email security and fraud prevention
Monthly Searches
3,600/mo
MRR Potential
$2K–$8K
Why Now?

Disposable email growth is exponential. Free tier abuse is a real cost center. API-first detection integrates at signup. Real-time detection prevents abuse before it starts.

Revenue Model

Free: 500 checks/day. Pro: $5/mo (5K/day + custom lists). Business: $15/mo (50K/day + webhook). Annual: 20% discount.

Competitive Landscape

Kickbox

Email verification. $5/500 verifications, broader scope

Disposable email lists on GitHub

Free, static, outdated within weeks, no API

Mailcheck.ai

Disposable detection. Free tier, decent, limited updates

Manual domain blocking

Endless whack-a-mole, always behind, impossible to maintain

Recommended Tech Stack

Next.jsNode.jsRedisCurated domain databaseVercel EdgeStripe

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