What is the Unlimited Email Verification API?
It's a subscription-based service that lets you verify unlimited emails per month. Instead of paying per verification, you pay for concurrent threads that process verifications in parallel.
How many emails can one thread process?
Throughput depends on destination mail servers, but each thread typically verifies tens of thousands of emails per day. More threads = faster processing for large lists.
Is this the same accuracy as the Real-time API?
Yes! The Unlimited API performs identical checks - SMTP validation, catch-all detection, disposable email filtering, and spam trap identification, with the same 99.7% accuracy.
Can I cancel or change my plan anytime?
Absolutely. All plans are month-to-month with no long-term contracts. Upgrade, downgrade, or cancel anytime from your dashboard.
Is the Unlimited API good for real-time form validation?
Yes! Dedicated threads provide consistent, millisecond response times perfect for validating emails at signup, checkout, or any web form in real-time.
What payment methods do you accept?
We accept all major credit cards (Visa, Mastercard, Discover, American Express) through Stripe. Enterprise clients can request invoice billing.
How do I integrate the Unlimited API?
Use our simple REST API with JSON/XML requests/responses. We provide documentation and code examples in PHP, Python, Node.js, and more. View the docs.
Are there any rate limits on email verification requests?
No artificial rate limits. Your thread count determines throughput. If you have 5 threads, you can process 5 concurrent email verifications at once. Scale to 50+ threads for high-volume email verification at enterprise speeds.
How does unlimited email verification improve sender reputation?
Sending to invalid, disposable, or spam-trap emails damages your domain reputation. Our unlimited email verification API catches these before you send, reducing bounces, improving deliverability rates, and protecting your sender score.
Can I use the API for real-time email validation on web forms?
Absolutely. The Unlimited API is ideal for real-time email validation at signup, checkout, or lead capture forms. Dedicated threads ensure consistent sub-second response times even during traffic spikes.
How fast is bulk email list validation with the Unlimited API?
Speed depends solely on total thread count. 10 threads process 10x faster than 1. The only bottleneck is destination mail server response times. Major providers like Gmail, etc. respond in milliseconds, while smaller private mail servers may take longer. We allow up to 60 seconds before timing out with a transient result, ensuring thorough verification across all server types.
What's the difference between credit-based and unlimited email verification?
Credit-based plans charge per verification and costs grow with volume. Unlimited email verification uses a flat monthly fee based on concurrent threads, making it far more economical for high-volume operations verifying millions of emails.
Is this cheaper than paying per verification?
Yes. If you verify more than 100,000 emails a month, our flat-rate model is significantly cheaper than a "pay-per-email" model. You can lower your cost to under $0.00005 per email.
What is a "Thread" exactly?
Think of a thread as a "worker." One thread can verify one email at a time. Since each verification takes milliseconds on average, a single thread can process up to tens of thousands of emails per day. Need more speed? Just add more threads.
Do you charge for "Unknown" results?
No. Unlike traditional pay-per-email models, our pricing is based on infrastructure capacity (concurrent threads) rather than volume. This means you have fixed, predictable costs regardless of how many millions of emails you process.