Last updated
August 7, 2023

The 7 best email validation APIs to use in 2023

Emma Jagger

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Are you creating a website where you want to ensure that the visitors to your site are not bots? You will want to spend some time learning and applying email validation and verification to your site.

Email validation and verification is a simple tool that many websites use as a means of checking that the individual signing up for emails or creating an account, is a real person. You have undoubtedly had to perform email verification at least once in your life since most websites take advantage of these types of software and programming. You can do something as simple as using a regular expression to validate an email address, but that approach is very limited.

Email validation and verification are when you type your email into a form when creating an account on a website, and the site sends you an email with a link to click. 

This shows the site and the programs that the email is an active email that will receive information, and that the owner of the email used to sign up for the account confirms that they are creating the account with their email. 

Related: Best Email APIs for developers

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What is an email validation and verification API?

Email validation and verification API is different from the email verification described above.

Email validation with an API goes much further than simply confirming the legitimacy and consent of the person and email account. This goes into the software and programmed protocols on your website.

You can create your protocols to specify the requirements from your website visitors when they sign up.

However, before we get into that, let’s discuss what an API is, how it works, and why you might want it involved in the validation process on your website.

Definition of an API

To begin to understand what an email validation and verification API is, you must first understand what an API is. 

An API is an “Application Program Interface” that works on a set of routines, protocols, and rules to create software applications. APIs create the specifics for how all the components of software work together and interact.

APIs allow communication from two different applications or information centers to send messages. Think about the request you make when you click a link online.

You request information from the link, and an API takes that request in the form of a message to another application or information center where it receives the response message and returns it to your screen.

How an API Works in Email Validation

An API in an email verification or validation software can work in multiple ways. 

For starters, an email verification API software can help ensure that the email accounts that people are signing up with are the types of email accounts you want to have on your email list. 

For example, you can set up your API software to detect common or possible misspellings when the visitors type in their emails. The visitor’s email may be misspelled in the domain sector, and an email verification API can alert the website visitor that there is a possible misspelling.

These misspellings could be instead of It is very important to catch these domain errors, otherwise, the emails will not get delivered to the account and get bounced back to the sender. 

When choosing an email verification API, you should also be mindful of how easy it is to integrate with your preferred language or framework. Many API products will come with guides and code samples, such as "How to do email verification in jQuery", "How to validate an email address in Javascript", "How to validate an email address in Ruby", and "How to do email verification in PHP".

Here are some common issues found while inputting email addresses, and how your API can detect and alert visitors to these issues.

Invalid email address 

This is a very common issue, where the visitor who is signing up with their email misspells the domain or forgets the “@” symbol. Submitting an email with an improper domain or without the symbol is considered an invalid email. 

An API with the programing to detect this will alert the visitor with a message, asking them to double-check the spelling of their email address.

Corporate and personal email addresses

If you would like to fine-tune the type of emails that can sign up for your newsletter or create an account on your website, you can program your email validation API to detect when a different type of email is being used to sign up.

If you want only corporate or business emails, you can program your API to search the “free_email” property on the API to check for “free.”

On the other hand, if you only want personal email addresses to be on the email list of your website, then you can program your API software to search the “sub-status” property for “role_based.”

Both of these programs will alert the person inputting the email that they should use a different account than the one they are currently using to sign up. 

Some website owners do not care whether the email accounts are personal or corporate, but some people tend to read their personal or business emails more than the other, and prefer to have all professional or personal accounts.

Fraudulent email accounts

If you seem to be getting nothing but fraud email accounts signing up on your website, you may want to look into having your email validation API run “domain_age_days” which tells the server how many days the email account has been active for.

Typically, fraudulent email accounts or “bots” have brand-new email accounts that have just been made for this purpose. You can have the API program refuse emails that have just been created as a security measure, and to avoid sending emails to no one.

What are the Best Email Validation and Verification APIs?

When it comes to the security of your website and the legitimacy of the data collected on sign-ups and new accounts, you need the real deal.

When it comes to the best email validation and verification APIs, you have to know what your website needs for it to have the proper functioning and data. Make sure that you have pinpointed issues that you think your website software need support in.

Here are some of the best API for email validation and verification that you can get to enhance your website.

Here are the API providers that will be reviewed below:

  1. Email Verification API
  2. ZeroBounce
  3. Email Checker
  4. Xverify
  5. BriteVerify
  6. Bouncer
  7. NeverBounce
  8. Bulk Email Checker
  9. Email List Verification


ZeroBounce is an API company that specializes in email validation API’s. ZeroBounce is great for both bulk email list verification and cleaning, as well as real-time on-site email verification.

You can 10,000 email verifications for $65. You are able to sample this service for 1 month, up to 100 email verification credits monthly. 

Additionally, ZeroBounce bounces and traps spam emails through the detection of bots and effective programming of spam email API.

A common service selected that ZeroBounce provides is the subscription service. It is more expensive than the single service, however, if you plan on using this API for multiple months, it is a better idea to get the subscription plan, since it comes with more features. 

ZeroBounce offers 24/7 customer service so you know whenever you need support, it is readily available. 


  • Works with both bulk list cleaning and real-time email verification
  • Email checker API with subscription service
  • Free monthly trial
  • Traps spam email through detection programing


  • Might be considered pricy for some small website owners
  • Limited free trial length

Email Checker

For smaller businesses, Email Checker might be the solution to your issues. This is a free service that checks the legitimacy of the email supplied in the box labeled “email address”. 

With this website, you can check the legitimacy of a single email at a time. This site does not work on bulk email list cleaning or verification. It does not work in real-time on your web page. This is for emails that you have already received.

The great thing about this web page is that it is free. However, it is highly inefficient, and for larger companies or owners of websites that get high amounts of traffic and emails each day, this method will take ages to verify the email addresses.

For smaller web page owners, this is the best free email verification service.


  • A free online service
  • Checks the legitimacy of emails 
  • Does not collect any data from any inputs


  • Un-able to do bulk email list cleaning
  • Very time consuming for websites with more email traffic


XVerify is the best email verifier API for the affiliate management community. This API can do bulk email list cleaning and verification as well as real-time on-site email monitoring. 

The price for 10,000 email verifications is $70, putting it at a close price to ZeroBounce, but a little bit more expensive. XVerify also has a free trial, which consists of 100 verifications before the trial ends. 

XVerify features IP blacklist monitoring, so you can stay sharp about where your IP and information is. This API does not have email duplicate removal, but it does have other features such as phone verification and address verification.


  • Efficient bulk email list cleaning and verification
  • Real-time, on-site email monitoring
  • Free trial
  • Other communication verifications offered
  • IP blacklist monitoring


  • A little bit more expensive than ZeroBounce
  • No duplicate email removal

BriteVerify From Validity

BriteVerify is an API made by the company Validity and is the email verifying industry’s longest-standing, as well as the most complete service for email and contact verification.

Every 24 hours, BriteVerify prevents 1.5 million invalid email addresses from being allowed into CRM systems. BriteVerify is a real-time on-site service that alerts visitors to misspellings or other issues with their contact information.

BriteVerify works with both domestic (United States of America) and international email servers and accounts. 

Each month, you can verify 250,000 emails, at just $0.01 per email. BriteVerify does not provide a free trial but features domain validation, which is a step further than email address verification.


  • A renowned company with years of experience
  • Real-time on-site email verification
  • Affordable for larger company sites
  • Domain verification
  • International and domestic verification


  • No free trial
  • Expensive for smaller website owners


Bouncer stands out as a highly precise and user-friendly email verification solution, ensuring reliable, GDPR-compliant data to boost the effectiveness of your email marketing efforts, boasting an impressive email validation success rate of over 99.5%.

Leverage Bouncer's capabilities to assess the bounce rates associated with your email list, ensuring your communications reach their intended inboxes – thereby preserving your sender reputation and enhancing email deliverability.

Pricing Details: Bouncer introduces flexible pay-as-you-go options, with prices starting at $0.008 per email verification for checks on 1,000 to 4,000 email addresses. Monthly subscription plans begin at $50, covering up to 10,000 email verifications.

Key Features:

  • Email Validation
  • Email Validation API
  • Seamless Integrations
  • Toxicity Check
  • Improved Deliverability Rates


  • Intuitive and straightforward interface, perfect for newcomers.
  • Capable of verifying a large volume of catch-all email addresses.
  • Exceptional customer support team, always ready to assist and enhance user experience.


  • In certain cases, the tool may struggle to complete the verification of an entire email list.
  • Response times may vary, potentially testing the patience of some users.


Not to be confused with ZeroBounce, NeverBounce is a very similar email cleaner API, with a specialization in supporting small businesses.

The cost for verification is much lower than other email verification API’s, which is why it is suited for smaller web page owners or small businesses. To verify 10,000 emails, it only costs $0.008 per email verification, making it highly affordable.

NeverBounce has additional features such as high-risk detection and instant bounce analysis, where information is reported to you about the contacts your company has. NeverBounce also removes duplicate emails from your list.

This API can be integrated with any type of system, and as a bonus safety feature, automatically eliminates potentially harmful emails entering your CRM.

You can try a single free email verification, but there is no extended or month-long trial. 


  • Small business and small website owner oriented
  • Affordable for smaller companies
  • Duplicate removal
  • High-risk detection and instant bounce analysis


  • No extended trial to see how it functions on the site

Bulk Email Checker

Bulk Email Checker is exactly as its name paints it to be. This site has both one-time bulk email verification for a set price and a set number of emails, and on your website using bulk email verification.

They provide email verification in bulk up to 25,000,000 emails and have client-based phone call consultation for enterprises that exceed that number. 

This bulk email verification is a very versatile source, since smaller web pages and businesses can use the lighter bulk email verification process, and huge companies can use the larger verification paths.

This might be considered the best email validation service, due to its adaptability to work with different level businesses and its affordable rates for all levels. 


  • Adaptable to multiple company and web page sizes
  • Affordable for all
  • Bulk-email cleaning and verification 
  • Free trial available (10 verifications per day)
  • Deep cleaning and SMTP test


  • Does not run real-time on-site to monitor

Email List Validation

Email List Validation certainly lives up to its name, because that is exactly what it does. Plus, this API is super easy to use, so it is the perfect place for any beginners who are building their first website and want email checking API.

Additionally, Email List Verification has a chat where clients can ask questions, making problem-solving, and any struggles that the web page owner may have quickly solvable.

Email List Verification provides a free trial for all new customers, so be sure to check it out if you are new to this site. 

This API and bulk-email validation company provide both duplicate email removal and spam trap indication. It also searches for emails that have not been active, indicating that they have been deactivated by the owner of the account, and removes them from the list.

Email List Verification is on the more expensive side, costing $59 for 10,000 email verifications. 


  • Great for beginners
  • Chat for customer support
  • Free-trial available
  • Bulk-email verification and API on-site monitoring


  • Far more expensive than other options

How to use an email validation and verification API

Email validation and verification are simple to use and explore. If you want to explore some API technology for free, on multiple topics, check out Abstract: Automate anything with Abstract APIs to explore the world of API.

How you can use the information, properties, and features of your API system is fairly simple. 

First things first, you will need to make sure you understand what your API system is programmed to do, otherwise, you may be looking for how many duplicate emails were removed but that function is not a part of your API software program.

When your API is working on-site at your web page, you will not receive information each time it catches something. You would probably go crazy if that was the case, considering how many people accidentally misspell their emails.

Your API will detect the programs and features that you have set for it to check for, like personal emails or invalid domains. Some API programs check for SMTP protocol, to make sure that the email account has a legit mailbox and inbox where the emails can be received. 

Your API can simply connect with your web page through a domain that is secured, for example, your ISP.

Steps to setting up an email verification and validation API

Here are the steps that most (not all,) API software programs follow to connect to your web page and beginning to work.

You may feel worried if you are not the greatest at computers, but please do not. This is a simple process if you follow the steps correctly.

Check to see if the API software you select has special steps on how to connect your web page to the API before you begin.

Step #1:

The first thing you will need to do is select and program your API. Whichever API software you choose to use will have instructions and walk-throughs on how to program and set-up your API software. 

Once you have your API software prepared, you will be ready to begin the connection process.

Step #2:

Create your email template responses to an invalid or incompatible email address when they are sent into the API on your web page.

These are those little messages that show up when you have misspelled an email on a domain, that lets you know to correct it.

Make sure that all aspects of your API are the way you want them to perform and present on your web page

Step #3:

The third step is to verify your service. Confirm with the API software provider and confirm your final API software product.

Step #4:

On the API provider’s web page, there will be information on how to perform the connection between your new API software and your web page. 

Follow their instructions exactly, making sure to double-check everything that you do. This is the most important part of getting your new API software to your web page. 

Once you have followed the instructions given by your API software provider, you should have your API connected to your web page. 

Now is the fun part!

Step #5:

Check to make sure that the connection was successful by going to the email input box and typing in a misspelled email, or make up an email with an incorrect or unacceptable domain.

If your web page refuses to accept the email, then congratulations! Your connection was successful and your API software is working properly.

If your web page allows it to enter the CRM, then you may have missed a step along the way. Try to retrace the instructions given by your API software provider and see if you can spot the step you skipped.

If you find the issue, but cannot fix it, it is suggested that you contact the customer support branch of the API company, and have them walk you through the steps and try to find what went wrong.

Whether someone helps you or not, eventually, your API will be running on your web page, and your email inputs will only provide real email addresses that you want!

Email verification and validation API FAQ’s 

In case you have lingering questions, please read on to the FAQ’s to help absolve them!

How much coding do I need to know?

Depending on the API provider, you will probably need to know a little bit about coding

However, you do not need to become a hacker overnight to get an API. You may have to do a little bit of research on how to get the specific qualities for your API.

You may be able to find an API provider that has a very simplified method for beginners, so try out the sites on our list that are good for beginners.

How much will it Cost?

Your API could be very cheap or rather expensive, depending on where you are getting the base coding and what features you want.

The variation can be from $20 to $200 or even more.

Knowing what you need and want for your site will help you spend only on those features, and save you money by preventing buying extras.

Is it worth it?

Yes! Email verification can help in so many ways! And so do other APIs that Abstract offers, such as the web scraping API or a company enrichment API.

You can have simple ones, just for junk mail API, or more complex ones, so you know that it is doing the job you need it to.

You can spend less time focusing on the legitimacy or frequent activity of your email list, and focus on growing your web page or company. Finally, make sure the company you're about to work with offers great customer support.


To conclude, email verification and validation APIs are an important part of your online presence and your outreach through communication.

Verifying and validating email addresses will help you grow your online presence, and help legitimize your newsletters, promotions, and connections with customers.

If you have been thinking about getting an email verifying API, then this is your sign to get it!

Emma Jagger
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