There are a few ways to validate or verify your email list for inactive and bad contacts. One such way is using an email verification API – a tool that can eliminate bad emails as soon as someone submits them on your website.
Thus, today, we’re going to show you the best email verification API services. Check them out with us.
What is an email verification API?
The process of verifying an email address in terms of its accuracy and authenticity, and whether it can be delivered successfully or not, is known as email verification.
An email verification API automates this process through API calls and validates addresses in real time.
It checks for syntax errors, misspellings, fake or disposable email addresses, and unreachable mailbox providers. It also identifies typos and verifies the domain to make sure the address is valid and active.
This tool just opens up a wider possibility of validating your emails in a 360-degree view and helps you eliminate the entire disposable, mistyped, and fake email addresses before they get stored in your database. With it, only high-quality, deliverable emails make it into your system.
As a result, you’re left with a list that’s safe to message. That means better open rates, stronger engagement, and less risk of being flagged by mailbox providers.
Some email API services go beyond validation. They let you test and send emails in production environments and help you manage your overall email deliverability.
Why is implementing an email verification API essential for your business?
Your marketing team puts in so much effort to build their email list through web forms, landing pages, sign-up flows, newsletters, blogs, or any freebies that your visitors love.
But, there’s no certainty if they provided an accurate and serviceable email address or not. If so many invalid addresses exist in your list, then your copywriters’ efforts in creating a wonderful email might not reach your prospects and real customers.
Hence, the need for an email verifier API arises, as no one wants to send to temporary email addresses. This is where email validation service helps.
Just integrate it with your systems and avail the following benefits of the email verification process:
Better email delivery rates
If you use an email verification API, your email list gets cleansed, so you can have only valid email IDs of happy customers with whom you can interact.
This way, a higher number of emails gets delivered to the destined inboxes. An email validator removes disposable email addresses, those that have expired, spam traps, bad email addresses with typos, incorrect email addresses, and others.
The end result? You only connect with real people, and there are fewer chances of your emails ending up in the spam folder.
Prevents from getting spammed
If you send emails repeatedly to invalid IDs and disposable addresses, ESPs, and ISPs may consider you spam and then blacklist your domain. And you know this is not good for your reputation and sender score, which is why an email checker API comes to your rescue.
Fewer bounce rates
With 360-degree validation and verification of all the emails in your list, the bulk email verifier for business can display detailed results in terms of correctness, deliverability, etc.
Therefore, you can filter quality emails in your email database and use only them while discarding the rest to reduce your bounce rates.
Saving time and expenditure
Apart from taking a lot of effort and time, you are required to maintain the list and send a tailored message to your contacts. Not to mention, the overall process involves some expenditure.
But if you keep sending emails to invalid IDs, your time, money, and efforts are all at stake. Hence, by using an email verifier, you can invest your resources in the right place that can produce results.
Now that you know what an email validation tool and API are, let’s discuss some of the best API services available in the market.
Bouncer
Bouncer is a powerful email verification tool built to help businesses verify email addresses in real time or in bulk. It’s trusted by both global companies and small teams who care about deliverability and data quality. It’s also fully GDPR-compliant, with data stored in secure AWS centers in the EU.
The Bouncer API is simple to integrate, lightning fast, and built for developers. Whether you’re validating signups from your web forms or cleaning a large list before a campaign, it scales effortlessly. It gives you detailed results like email score, toxicity, and even info on free email providers.
Here’s what you get with Bouncer:
- 99%+ accuracy
- Free testing for 100 emails
- Sample email list validation to estimate bounce rates
- Premium support through chat and email
- A high deliverability rate, no matter how many emails you send
Price: Starting from $8 for 1000 email addresses in pay-as-you-go rates. Monthly subscription plans included, for $6/month for 1000 verifications.
Best for: Small businesses, marketers, and enterprises that want reliable, scalable email verification with real-time and batch capabilities.
👉 Read more: What is the Best Free Email Verifier in 2025?
Mailboxlayer
Mailboxlayer delivers a fast and developer-friendly email validation API that checks the quality and deliverability of email addresses. It uses a simple RESTful structure and returns results in lightweight JSON format. You can monitor your API usage daily or monthly, with the option to set up alerts to track performance and stay in control.
The API includes:
- Syntax and typo checks
- SMTP verification
- Filtering of disposable and free email providers
- A quality score that helps you assess deliverability
Price: Free for up to 1,000 API requests. Next, five paid plans, starting from $7.99 monthly for 2,500 API requests.
Best for: Developers.
EmailHippo
EmailHippo’s API helps you verify email addresses in real time. It checks each address for syntax errors, typos, disposable domains, and catch-all servers. It also flags potentially risky addresses using greylist detection. You can monitor and manage your email data easily, with clear results and structured output that’s ready to use in your CRM, sign-up forms, or marketing tools.
Price: From $9.88/month for 1,000 email checks in Edition 1.
Best for: Developers, marketers, or fraud fighters.
ZeroBounce
ZeroBounce helps you identify and remove invalid, disposable, or risky emails before they damage your reputation. It offers a real-time email validation API that you can use on websites, landing pages, or in bulk to keep your list clean and reduce bounce rates. The platform includes SDKs for major languages (Python, PHP, Java, etc.) and integrates with most marketing platforms.
You get tools to:
- Flag and remove typos, spam traps, and abuse emails
- Detect catch-all domains and disposable email providers
- Run batch verifications (up to 200 emails at once)
- Add or exclude addresses using custom allowlists or blocklists
Price: Starts at $20 for 2,000 email validation credits (pay-as-you-go).
Best for: Startups and SMBs.
Kickbox
Kickbox helps you detect fake, mistyped, or low-quality email addresses at the point of entry. Its real-time verification API works across platforms and supports libraries for Python, PHP, Node.js, and Ruby. The API checks emails as users type, flags invalid addresses, and allows real-time corrections. It’s GDPR compliant as well.
Pricing: Free for the first 100 email verifications. For 1,000 checks, you will pay $80 in pay-as-you-go.
Best for: Developers and marketers.
👉 Check out: 14 best email verification tools.
Abstract
Abstract offers a developer-focused email validation API to help you maintain clean, accurate email lists and improve deliverability. It checks for invalid addresses, syntax errors, and risky domains. The system’s API is secured with 256-bit SSL encryption and built to scale, with support for bulk operations and consistent 99.99% uptime.
You get built-in tools to:
- Catch typos and suggest corrections
- Detect disposable and free email providers
- Flag spam traps, role-based emails, and catch-all domains
Pricing: Free for up to 100 requests. Paid plans start at $12/month (billed annually) for 150,000 yearly requests.
Best for: Developers and small companies.
GetProspect
GetProspect’s email verifier API helps you check if an email address is valid, improving deliverability and protecting your sender reputation. You can verify emails instantly during lead capture or before launching a campaign to reduce bounce rates and avoid sending to invalid or unknown addresses.
The API is RESTful, returns data in JSON, and is easy to integrate into your existing lead gen or outreach systems. GetProspect also offers additional endpoints for email finding, contact and company data, and lead searches.
Pricing: Free plan includes 50 valid emails and 100 verifications per month. Paid plans start at $49/month for 1,000 valid emails and 2,000 verifications.
Best for: Outreach teams and small businesses.
NeverBounce
NeverBounce email verification API helps you keep your contact lists clean and your email data accurate. The API supports multiple programming languages (Node.js, PHP, Python, Ruby, Go, Java, .NET, and more) and lets you create custom integrations with unique API keys. For non-developers, a JavaScript widget is also available.
New users get 1,000 free verifications to test the API with both single and bulk emails. Features include real-time bounce detection, advanced sync, and enterprise-grade security.
Price: Starts at $8 per 1,000 emails on the Basic Plan. Sync plan starts at $10/month.
Best for: SMBs and enterprises.
Twilio SendGrid
Twilio SendGrid offers an email API service built for developers who need reliable, scalable sending with smart validation tools. It’s used by leading companies to send over 148 billion emails per month and supports a wide range of use cases.
The API checks for typos, formatting issues, and invalid addresses before sending emails. The validation engine is machine-learning powered and works directly in your sign-up forms.
Pricing: There is a limited but free trial, next three paid plans, starting from $19.95 monthly.
Best for: SMBs.
QuickEmailVerification
QuickEmailVerification offers an email validation API for businesses that need clean, accurate data across their signup forms, CRMs, and marketing platforms. The API is easy to integrate with ready-to-use libraries for PHP, Python, Node.js, Ruby, and more. It supports real-time verification for on-the-fly checks, as well as batch processing.
Key features:
- Catch typos and suggest corrections during sign-up
- Filter out disposable, invalid, or shared email addresses
- Works with web forms, ESPs, and marketing automation tools
Pricing: One-time payments (start at $4) and daily payments (from $0/month).
Best for: Marketing agencies, e-commerce businesses, finance institutions.
BriteVerify Validity
BriteVerify by Validity helps you prevent bad data from entering your systems and keeps your email list accurate and actionable. You can run bulk verifications by uploading your list or use the real-time API to check emails as they’re collected through forms, CRMs, or other systems.
Validity pros:
- Real-time email verification at point of entry
- Bulk list cleaning with drag-and-drop upload
- Integrates with CRMs, ESPs, and marketing platforms
Price: Pay-as-you-go starting at $40 for 5,000 verifications, or a subscription.
Best for: SMBs and enterprises.
DeBounce
DeBounce offers a fast, cloud-based email validation API that helps you maintain clean mailing lists. It detects invalid, inactive, and spam-prone addresses before they affect your deliverability – and even retrieves associated avatars when available.
You can use the API for both real-time validation at sign-up and bulk list cleaning via upload. It supports a wide range of checks, including SMTP status, domain confirmation, catch-all detection, anti-greylisting, syntax validation, and spam trap removal.
Pricing plan: Starts at $10 for 5,000 email verifications.
Best for: Start-ups, SMBs, developers, and enterprises.
Xverify
Xverify helps online marketers reduce hard bounces, detect fraud, and improve deliverability. You can check them through batch uploads or integrate their email verification API directly into your website, mobile app, or CRM. The system scans if an email is registered at the domain, flags fraudulent or temporary accounts, and suggests corrections for common typos.
What you get with Xverify API:
- Real-time results in under one second
- Auto-correction for common domain typos
- Built-in fraud protection and temporary email detection
Price: Pay-as-you-go, starting at $10 for 1,000 verifications.
Best for: Marketers and public companies.
Mailgun
Mailgun’s email validation API helps you reduce bounce rates, cut costs, and protect your reputation by identifying invalid or high-risk email addresses before you send. It runs multiple verification layers – SMTP status, disposable email detection, role-based address filtering, RFC syntax validation, and typo suggestions. It’s quite fast, really secure, and built to scale.
Pricing: Free plan with 100 emails/day. Paid plans start at $15/month.
Best for: Developers.
Emailable
Emailable offers a real-time and bulk email verification API that’s simple to integrate, affordable, and built to scale. The API supports HTTP requests and client libraries in Node.js, Ruby, and Python, with batch operations, webhooks, and a full test environment.
It checks every email address for disposable domains, catch-all status, mailbox existence, and syntax accuracy. You’ll also catch role-based addresses, misspellings, duplicates, and tagged emails before they affect your campaign results.
Emailable assigns a 0–100 quality score to each email, includes anti-greylisting tech for more reliable results, and supports name and gender detection.
Pricing: Starts at $38 in credit-based model. There’s also a model for deliverability.
Best for: Marketers and developers.
Bulk Email Checker
Bulk Email Checker is a straightforward tool for verifying if an email address is real, valid, and deliverable. It runs each address through a 17+ factor validation process, including RFC syntax checks, domain verification, and a deep SMTP test. You can use it via the web app or integrate the real-time email verification API into your signup forms.
API options:
- Real-time validation with deep SMTP testing
- Disposable and blacklist filtering
- Duplicate and misspelled domain detection
Pricing: Paid plans start at $9.95 for 10,000 validations.
Best for: Agencies and occasional users.
Conclusion
Congratulations! You have reached the end of our list! Now you have a better picture of an email verification API and its importance. Now, choose the API that fits your budget and delivers what’s most important to you.
And if you want to try out a secure and reliable API service, take advantage of Bouncer’s free trial today!
