Dedicated Resources
Private cloud infrastructure dedicated solely to your Unlimited API requests for maximum speed and reliability.
Unlimited Volume
No monthly limits on how many emails you verify. Send as many verification requests as your threads can process.
Concurrent Power
Choose your thread count. 1 thread = 1 real-time concurrent verification connection.
RESTful API Endpoint
Modern REST email verification API responses. jSON/XML response is compatible with most programming languages by default.
Seamless Plan Changes
Upgrade or downgrade threads anytime. Total control over your verification capacity.
Cancel Anytime
All plans are monthly recurring. No long-term contracts—cancel the Unlimited API anytime from your dashboard.
How the Unlimited Email Verification API Works
Instead of buying credits, the Unlimited Email Verification API uses a simple, scalable thread model. Each thread represents a dedicated, concurrent connection that processes one email verification at a time. By increasing your thread count, you increase the number of email addresses you can verify in parallel while still enjoying truly unlimited monthly verification volume.
This architecture is ideal for real-time email verification on signup forms, continuous email list cleaning, and large batch jobs that require predictable performance. Your application talks to a modern REST endpoint and receives fast JSON responses that make it easy to flag invalid, risky, or disposable email addresses.
Use Cases for the Unlimited API
- Protect registration and checkout flows with real-time email validation.
- Automate ongoing email list hygiene inside your CRM or marketing automation platform.
- Run large bulk email verification jobs against data warehouses and internal databases.
- Offer built-in email verification inside your own SaaS product or ESP platform.
- Maintain a clean, high-quality sender list to improve inbox placement and deliverability.
Ready to scale your email verification?
Create an account and choose your thread count to get started instantly.
Sign Up NowNeed more than 50 threads? Contact us for enterprise pricing.
Unlimited Email Verification API — Frequently Asked Questions
What is the Unlimited Email Verification API?
The Unlimited Email Verification API is a dedicated email validation service that lets you verify an unlimited number of email addresses each month. Instead of paying per verification, you select how many concurrent threads you need and enjoy predictable, subscription-based pricing.
How many emails can one thread process?
Actual throughput depends on the responsiveness of destination mail servers, but each thread can typically verify tens of thousands of email addresses per day. Adding more threads increases your concurrent capacity and reduces total processing time for large lists.
Does the Unlimited API include high-accuracy SMTP testing?
Yes. The Unlimited Email Verification API performs the exact same in-depth checks as our standard system, including high-accuracy SMTP testing. It validates the mailbox existence and provides a very detailed test to detect catch-all, disposable, and risky email addresses with industrial-grade precision.
Can I cancel or change my Unlimited API plan?
Yes. All Unlimited API plans are month-to-month. You can cancel, upgrade, or downgrade your thread count at any time directly from the Bulk Email Checker control panel.
Is the Unlimited API good for real-time verification on forms?
Absolutely. The Unlimited Email Verification API is designed for both real-time verification and large batch jobs. Dedicated threads provide consistent response times, helping you keep invalid and high-risk email addresses out of your system at the point of capture.