2) EmailHippo email verification API

The EmailHippo email verification API offers a fast, simple, and secure way to validate email addresses in real-time. It is designed to be integrated into sign-up forms, marketing platforms, and CRMs, ensuring that email addresses are verified quickly and accurately.
API Features
- Disposable Email Address Detection: Monitors new email addresses 24/7 to block disposable email addresses used for fake sign-ups and fraudulent activity.
- Trust Score (Edition 2 only): Provides a numerical score from 0-10 indicating the trustworthiness of an email address.
- Dark Web Link Checks (Edition 2 only): Highlights domains connected to dark web users to prevent potential security threats.
EmailHippo email verification API Pricing
- Edition 1: Verify up to 2.5 million emails per month. Subscription options include monthly, quarterly, or annual plans starting from $9.88 per month.
- Edition 2: Offers additional features like Trust Score and Dark Web Link Checks. Verify up to 2.5 million emails per month with plans starting from $9.88 per month.
- Enterprise: Includes all features from Edition 1 and 2. Requires an agreed contract duration and payment terms. Contact support for pricing.
3) MailerCheck

MailerCheck is an email verification service that helps keep email lists clean by verifying new email addresses in real-time. It filters out emails with typos, errors, catch-all domains, and more to improve email deliverability and maintain sender reputation.
API Features
- Custom API and Zapier Integration: Connect MailerCheck’s email verification service to your apps via a custom API or through Zapier for flexible and easy integration.
- Detailed Status Returns: The API provides various statuses such as valid, invalid, typo, mailbox not found, and more, allowing for precise handling of email addresses.
- Additional Email Monitoring Tools: Utilize tools like Email Insights, Inbox Placement, DMARC Reports, and Blocklist Monitoring to optimize email deliverability and security.
MailerCheck Pricing
- Pay as you go: $0.01 per credit with a minimum purchase of 1,000 credits.
- Free Plan: Includes 1 user, 1 DMARC domain, 2 blocklist monitors, and email support.
- Basic Plan: Costs $125/month and offers 1 user, 10 DMARC domains, 64 blocklist monitors, and email support.
- Premium Plan: Priced at $275/month, it includes 5 users, 20 DMARC domains, 256 blocklist monitors, and email support.
- Enterprise Plan: For $975/month, it provides unlimited users, unlimited DMARC domains, 1,024 blocklist monitors, and email support.
4) APILayer Email Verification API

The APILayer Email Verification API is designed to verify the validity and deliverability of email addresses. It helps maintain a clean email list by filtering out invalid, disposable, and role-based email addresses through real-time verification by connecting to the mail server and checking if the email exists.
API Features
- Real-time SMTP Server Connection: The API connects directly to the recipient's SMTP server to verify the existence of the email address in real-time.
- No Historical Data Usage: The verification is performed without relying on outdated or historical data, ensuring current and reliable information.
- Multiple Validation Methods: Utilizes regex validation, DNS for MX records, and SMTP server connection to confirm the email's existence, enhancing accuracy.
APILayer Email Verification API Pricing
- Free Plan: Offers 100 requests per month, free for a lifetime, with no credit card required.
- Starter Plan: Costs $14.99 per month and includes 5,000 requests with standard support.
- Pro Plan: Priced at $74.99 per month, providing 50,000 requests and standard support.
- Enterprise Plan: Available for $249.99 per month, offering 250,000 requests and standard support.
- Custom Plan: Pricing is volume-based and requires contacting support for details.
5) Cloudmersive Full Email Address Validation and Verification

Cloudmersive Full Email Address Validation and Verification offers real-time, on-demand email verification with high performance, making it suitable for user experience applications such as signup and checkout flows. It supports multi-factor validation, including syntax, DNS, and server-level email verification.
API Features
- Real-time Email Verification: Provides instant, on-demand, real-time email verification suitable for user experience applications like signup and checkout flows.
- Highly Scalable APIs: Allows API calls from over 10 different programming languages, ensuring high scalability for verifying as many email addresses as needed on demand.
- Enhanced Support: Offers around-the-clock support for assistance and guidance.
Cloudmersive Full Email Address Validation and Verification Pricing
- Small Business Plans: Suitable for businesses with fewer than 50 employees. Basic security capabilities and multi-tenant cloud deployment.
- Medium Business Plans: Suitable for businesses with up to 250 employees. Offers multi-tenant and single-tenant cloud deployment, on-premises options, advanced security, and SLA agreements.
- Enterprise Plans: Suitable for businesses with an unlimited number of employees. Includes multi-tenant and single-tenant cloud deployment, on-premises options, advanced security, SLA agreements, and enhanced support.
- Government Plans: Suitable for government entities with an unlimited number of employees. Features government cloud deployment, on-premises options, advanced security, SLA agreements, and enhanced support.
- Custom Plans: Tailored to specific needs and require contacting support for detailed pricing information.
What to Consider When Selecting a Proofy.io Alternative?
- Accuracy: Ensure the service provides high accuracy in email validation to minimize errors and improve deliverability.
- Speed: Look for fast verification processes to keep workflows efficient and avoid delays in email campaigns.
- Integration: Choose a service that offers easy and secure integration with your existing platforms and applications.
- Data Protection: Verify that the service complies with privacy standards and has secure processes to protect your data.
- Cost: Consider the pricing plans and available credits to ensure the service fits within your budget while meeting your needs.
Which One Should You Go With?
Each of the email verification services discussed offers unique features and benefits, making any of them a solid choice for maintaining a clean and effective email list. However, if you're looking for a reliable and comprehensive alternative, we recommend signing up with Abstract API. Its robust features, ease of integration, and excellent customer support make it a standout option.
Abstract API provides real-time MX and SMTP checks, typo detection, and compliance with privacy standards like GDPR and CCPA. With its competitive pricing and world-class documentation, Abstract API is designed to meet the needs of businesses of all sizes. Sign up today and experience the benefits of a top-tier email validation service.