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Which are the best real-time email validation APIs?

How can i use real-time email validation API, and which one should i use?

email list verification

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6 Answers

Marcus G.
Marcus G. answered 1 year ago

Email Verification can be done manually or through an API. Email Validation APIs are a collection of self-service tools that allow you to check the validity of email addresses in real-time quickly. Validating email addresses can help protect your site from spam, ensure that email recipients receive messages, prevent fraud, and protect you from bounces.

Best real-time email validation API providers are listed below to ensure your email list is as accurate and error-free as possible.

ZeroBounce : They are very accurate and fast for validation in real-time. The response time for ZB’s API is between one second and 70 seconds. On average, 96-98% of all domains will return in 1 to 5 seconds.

Validate API code samples are available in Visual Basic, C#, PHP, Java, Python, Swift, Objective C, and Android Java.

  • API URL:
  • API URL (With GEO Append):

If you want to call the API from your browser to test it, all you need to do is to replace the API KEY with your key:[email protected]&ipAddress=

If you don't need GEO Append, simply call the validate method:[email protected]

  • 1 Credit = 1 Email Verification
  • ZeroBounce price starts from $16.00 USD for 2000 credits.

For more details, access this API doc:

MillionVerifier : The most effective email verification service. It emerges with its outstanding accuracy and super low prices.

Using MillionVerifier's API, you can avoid bad emails added to your email lists. You may also use their API to resell their services.

Use your API key to identify your account when making an API call. Each endpoint contains an example of how to use their API. Simply just replace "your-api-key" with your API key you can find on this page:

Validate API code samples are available in PHP, cURL, Go, Python, Ruby, Java, NodeJS, and C#.

The following versions are supported to make a successful request in certain programming languages:

  • PHP 5.4.45

  • Python (Requests module) 1.0.0

  • cURL 7.65.3

  • Java (OpenJDK) 10

  • NodeJS 0.10.28

  • C# (.NET Core) 2.1

  • Single API base URL:

  • Bulk API base URL:

  • 1 Credit = 1 Email Verification

  • MillionVerifier price starts from $29.00 USD for 10,000 credits.

For more details, check this:

MyEmailVerifier: Easy and affordable email verification service with API support.

Their Email Validation Real-Time API is simply based on the JSON web service, which allows developers to verify individual email addresses on-demand as a user enters them in a web form or mobile application.

Single Email Validation API:[email protected]&apikey=API_KEY

NOTE: <API_KEY> - You can find your API key from your client area - API section

Bulk Email Validation API:

  • 1 Credit = 1 Email Verification
  • MyEmailVerifier price starts from $21.6 USD for 10,000 credits.

For more details, check this:

You can compare the best email verification API providers here - Top 10 Email Verification Service.

BounceKick answered 4 years ago

When you choose any SaaS based email verification they all give you a existing status of email verified from their database. When you use Real-Time API it should verify the email on the fly every time and give the result instead of pulling the result from the existing database.

BounceKick (Self-Hosted Email Verification Software) has a Real-Time API feature which always does the verification through SMTP check each every email as fresh. This give you a 100% valid result.

Greg Jordan
Greg Jordan answered 4 years ago

Email Checker ( offers an industry-leading Real-Time API that is quick and easy to integrate.

You can sign up for a free API key and account here:

You will also get 100 free credits when you sign up for an account so you can carry out some testing:

Dan Straton
Dan Straton answered 4 years ago

I recommend using Zerobounce. They have API real-time validation, that can be integrated with every website, and they have a bulk-API validation. The response time for the API is between one second and 70 seconds. On average 96-98% of all domains will return in 1 to 5 seconds. All the major ISP will return in 1 to 3 seconds, which is usually the majority of most email distribution.

George answered 4 years ago

Have you tried ZeroBounce? Click here to visit the homepage and get a chance to test some emails, and, even better, make sure to register for an account, you will receive 100 email validations to properly test the service, no credit card required.

The API is fast. It supports up to 50,000 concurrently requests and the average response time is between 2-4 seconds with a customizable timeout parameter.

It's easy to use and has great integrations. Directly import and export to Mailchimp, Constant Contact, AWeber, Hubspot, and many others. Here is the official list.

Very good documentation and support. Here is a place to find everything you need to know if you want to integrate the API into a website or program.

24/7 support. Do not hesitate to contact the customer support for any question

GP answered 4 years ago

Almost all email verification service providers will support real-time validation through API, but would highly recommend Clearout real-time instant verification API, as it has been constantly optimized for the blazing response time (<300 milliseconds) for free domains like Yahoo, Gmail, AOL etc.,

Also, the API comes with the timeout parameter that helps enhancing the best user experience in case verification takes longer than expected.