Verifier - Weed out disposable, non-existent domains or invalid emails.

NotificationX - Best social proof and FOMO marketing solution for WordPress to increase conversion rates.

Validator.pizza - Free API to block 🗑 disposable emails

Nudgify - Nudgify is a Social Proof App that includes FOMO, Urgency and Review Nudges. Adding Social Proof notifications to your site helps you build trust and increase conversions on Shopify, Wordpress or any other platform.

Antideo - Email, IP address and phone number validation API service

ProofGain - Supercharge your conversions with a simple social proof tool