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.
Mailboxlayer
Mailboxlayer’s API makes email validation feel like less of a chore. It’s quick to plug into your app, if you are a developer. It’s also lightweight and gives you a fast read on whether an email is worth sending to. Nothing flashy, just a clean, reliable tool that helps keep your list tidy and your delivery rates in check.
The API features:
- Full verification – Checks emails as they’re submitted, so only real, valid contacts make it into your system.
- Simple & secure – Uses an easy REST URL structure, returns JSON, and is protected with 256-bit HTTPS.
- Advanced tools – Detects syntax errors, typos, disposable or free domains, and includes a quality score.
Price: The tool includes 1,000 free requests each month, with paid plans starting at $9.99.
Best for: Developers.
EmailHippo
EmailHippo’s API in the MORE product helps you verify email addresses in real time. It works in real time, plugging right into your sign-up or data collection flow to stop fake accounts, spam traps, and bad actors on the spot.
The API is fast, secure, and packed with smart checks that go beyond the basics, so you’re not just validating emails, you’re cleaning up your entire pipeline.
Key API features:
- DNS & MX record checks – Confirms the email domain exists and is set up to handle mail.
- SMTP check – Verifies if the address can actually receive emails.
- Enhanced infrastructure analysis – Detects misconfigured or high-risk email servers.
- Gibberish & profanity detection – Flags fake or inappropriate addresses.
- Role-based email detection – Identifies low-engagement addresses like info@ or support@.
Price: Pricing for the MORE product starts from $9.88/month for 1,000 email checks. It’s the price per month.
Best for: Developers, marketers, or fraud fighters.
ZeroBounce
ZeroBounce‘s API services are like a full-stack toolkit for serious email marketers. You can validate emails in real time, find new contacts, score email quality, and even detect subscriber activity—all from a single platform. It’s flexible, developer-friendly, and packed with options to keep your sender reputation clean and your list performing at its best.
You get tools:
- Email validation API – Automatically verifies emails with a 99% accuracy guarantee, available in 13 languages.
- Email finder API – Finds valid email addresses for outreach with built-in verification.
- Activity data API – Adds engagement insights to your contacts, helping you identify your most active subscribers.
- List evaluator API – Analyzes your whole list to highlight weak spots before sending.
- Email scoring API – Rates each email’s quality and risk level, so you can prioritize safely.
- API wrappers & migration tools – SDKs and migration guides make setup easy in multiple languages.
Price: API is included in all ZeroBounce accounts. Prices start at $18 for 2,000 email validation credits (monthly).
Best for: Startups and big companies.
Kickbox
Kickbox‘s Email Verification API is built to stop bad email data before it ever hits your system. It runs real-time checks at the point of capture – during signups, purchases, or form fills – so you can filter out fake, mistyped, or risky addresses immediately. It’s GDPR compliant as well.
Some key features include:
- Real-time email verification – Instantly checks if emails are deliverable, risky, or disposable during form submissions.
- Batch verification – Verify up to 1 million emails via API, without uploading files manually.
- Typo detection – Suggests corrections for mistyped emails to improve data quality and conversions.
- Detailed API responses – Returns status, reasons, and metadata so you can make smart filtering decisions.
Pricing: General pricing. Free for the first 100 email verifications. For 10,000 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. Whether you’re cleaning up email lists, enriching lead data, or geolocating users by IP, it’s all handled through clean endpoints with great docs and SDKs. It’s also enterprise-ready, with strong compliance, 24/7 support, and integrations
You get built-in API tools to:
- Email validation – Real-time verification to reduce bounces.
- Company enrichment – Add business details to domains or emails.
- Phone validation – Clean up phone data for better contact rates.
- IP geolocation – Pinpoint users by IP (city, region, country).
- Public holidays – Get holiday data by country, any time.
Pricing: Each of the API’s has a free plan and several paid options.
Best for: Developers and larger companies.
GetProspect
GetProspect’s Email Verifier API is all about keeping things simple and useful. You can plug it into your product or app to quickly check email addresses and improve how you capture leads. It’s easy to set up and gets you started right after signup.
Key API features are:
- Email verification – Validates email addresses for better lead accuracy.
- Easy integration – Quick setup with clear API keys.
- Lead capture support – Helps build cleaner, more reliable prospect lists.
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.
With support for popular languages and simple deployment, it’s quick to integrate into your own tools or workflows. Developers can create custom apps with unique API keys and unlock advanced settings, while non-dev users can still access email verification through a handy JavaScript widget.
Top features:
- Multi-language wrappers – Available for cURL, NodeJS, PHP, Python, Ruby, Go, Java, and .NET.
- Advanced reporting – Track usage and performance through integration-specific metrics.
- JS widget option – For non-devs who need a simpler way to verify emails.
Price: General pricing. 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 which is made for high-volume, high-speed email programs that need to scale without losing deliverability. It’s built for developers but packed with tools marketers will appreciate – like dynamic templates, email validation, and powerful analytics.
API options:
- RESTful API & SMTP relay – Send and manage emails at scale across multiple languages and frameworks.
- Dynamic templates – Build and customize responsive emails with ease.
- Email validation API – Reduce bounces by checking addresses before sending.
- Authentication support – Includes SPF, DKIM, DMARC, and TLS for secure delivery.
- Email testing – Check for spam triggers, broken links, and rendering issues.
Pricing: There is a limited but free trial, next three paid plans, starting from $19.95 monthly.
Best for: Developers, marketers.
QuickEmailVerification
QuickEmailVerificatio ’s API helps you catch bad email addresses before they slip into your list. It’s designed to plug in anywhere (signup forms, CRMs, marketing platforms) so you can verify emails in real time or clean up large lists behind the scenes.
Key features:
- Real-time verification – Instantly checks emails as they’re typed in, blocking typos and fakes.
- Batch verification – Clean large lists automatically to remove bounces, duplicates, and toxic addresses.
- Email typo suggestions – Helps users correct common domain mistakes during signup.
- Wide integration support – Easily integrates into web forms, platforms, and apps.
- Developer-ready libraries – Available for PHP, Node.js, Python, Ruby, and more.
Pricing: Free tier includes 3,000 verification credits per month at no cost. One-time payments (start at $4) and daily payments (from $0/month).
Best for: Marketing agencies, e-commerce businesses, finance institutions, developers.
BriteVerify
BriteVerify‘s API is built for real-time validation and large-scale database hygiene, all while fitting neatly into the tools your team already uses. Whether you’re capturing emails through a form or prepping a massive campaign list, the API lets you verify addresses on the fly or in bulk—without disrupting your workflow.
Validity pros:
- Real-time email verification at the point of entry
- Bulk list cleaning with drag-and-drop upload
- Integrates with CRMs, ESPs, and marketing platforms
- Direct platform integrations – native support for Salesforce, Iterable, and more.
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’s simple to integrate with any language and built to scale, whether you’re verifying signups one by one or cleaning up a million-record list. With layers of smart checks (like typo suggestions, spam trap detection, and mailbox testing), it helps keep your list clean and your sender reputation intact.
Key features:
- Real-time & bulk validation – Check emails on the fly or upload full lists for processing.
- Bounce detection & SMTP testing – Identifies invalid or unreachable mailboxes.
- Spam traps & disposable filters – Blocks risky, fake, or temporary addresses.
- Syntax & DNS checks – Verifies correct formatting and confirms mail server existence.
- Typo correction – Offers suggestions for common misspellings (e.g., gmil.com → gmail.com).
- Role, complainer & free email filtering – Flags emails like info@ or known complaint sources.
Pricing plan: Starts at $10 for 5,000 email verifications.
Best for: Start-ups, SMBs, developers, and enterprises.
Xverify
To the best email verification API services belong also Xverify. It’s built to help you catch bad emails right at the source, before they mess up your data or cost you conversions. You can plug it into web forms or mobile apps to verify addresses in real time, or go the simpler route with a JavaScript plugin or file uploads. It’s flexible enough for dev teams that want control, and easy enough for marketers who just want clean lists.
What you get with Xverify API:
- Real-time email verification – Instantly checks emails during form entry to prevent errors.
- JavaScript plugin – Quick to implement with no heavy coding required.
- Fast API access – Gives developers full control over validation logic.
- FTP & web upload options – Verify large datasets without any coding.
Price: Pay-as-you-go, starting at $10 for 1,000 verifications.
Best for: Marketers and public companies.
Mailgun
Mailgun’s email validation API is a developer-first tool that makes it easy to send and manage emails directly from your app. Whether you’re handling transactional messages or scaling a full email program, it should be flexible, fast, and secure.
Key options:
- Send API & SMTP – Trigger transactional and app-based emails seamlessly.
- Email logs & analytics – Track delivery, opens, and performance over time.
- Email routing – Customize how incoming emails are handled in your app.
- RESTful design – Easy to integrate with clear, developer-friendly documentation.
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 and built to scale. You can drop it into your website, landing page, or app to filter out bad emails instantly, no matter if you’re working on a startup or powering a large-scale platform.
With flexible integration options, usage insights, and client libraries in multiple languages, it’s a lightweight way to keep your email data sharp.
You will find here:
- Detailed response data – Returns deliverability status, domain info, role-based flag, and more.
- Client libraries – Available in Node.js, Python, Ruby, and more.
- Batch & webhook support – Automate large list cleanups and handle results in real time.
- Usage dashboard – Visualize API activity and results over time.
Pricing: Starts at $38 in credit-based model. There’s also a model for deliverability.
Best for: Marketers and developers.
Bulk Email Checker
The list of best email verification API services finishes Bulk Email Checker. Its API is all about catching bad email data before it costs you a customer. It should help you block common typos, bounces, and disposable addresses. It’s a practical tool to cut down on delivery issues and improve the quality of your email database without a ton of overhead.
API options:
- Real-time email verification – Flags typos, bounces, and invalid emails at the point of entry.
- Deep SMTP checks – Verifies email deliverability directly with the mail server.
- Disposable email detection – Blocks throwaway addresses from entering your list.
- Blacklist filtering – Cross-checks against your own list of banned addresses.
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 of the best email verification API services! Now you have a better picture of an email verification API and its importance. 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.
Try free email verification with Bouncer.
