Postcoder
Postcoder is an API from Allies Computing that gives developers a single endpoint for verifying and validating customer contact data at the point of entry. Used across sectors from healthcare to retail, it's built to drop into checkout, onboarding, and account creation flows with minimal friction.
What's included:
Address lookup – Postcode, partial address, or coordinate-based search across Royal Mail PAF, Ordnance Survey AddressBase, and 249 countries worldwide.
Bank validation – Real-time sort code and account number verification, with branch data and direct debit eligibility returned in the response.
Email validation – Domain and formatting checks with disposable address detection.
Mobile validation – Live network status checks across 200+ countries.
OTP verification – SMS-based one-time password delivery.
Clear documentation, multi-language sample code, and a straightforward REST structure mean integration is quick. 30 day free trial with no credit card required.
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Reoon Email Verifier
One of the most accurate email validation services that cleans invalid, temporary & unsafe email addresses. Reoon can verify the most difficult email domains, including Gmail, Yahoo, Microsoft, AOL and Custom Domains with 99% accuracy. With Reoon Email Verifier you can:
1. Verify emails from Gmail, Yahoo, Microsoft, AOL and other domains.
2. Validate email addresses in bulk without sending any emails.
3. Clean up email lists with great accuracy (99%).
4. Detect dynamically changing temporary/disposable addresses.
5. Significantly reduce the bounce rate of email campaigns.
Unique things about Reoon Email Verifier:
1. Can detect soft bounces like storage full or account disabled on Gmail etc.
2. Can detect temporary emails dynamically to catch the latest domains.
3. Quick API Validation can verify emails live within 0.5 seconds.
It's a web application and runs on Reoon's server. Users can access and use this from any web browser.
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Web APIs by Melissa
Melissa’s Web APIs provide a comprehensive solution for global data verification, cleansing, and enrichment to maintain reliable data. Verify, standardize and cleanse global identities, addresses, phones & emails, powered by AI-driven reference data. Our flexible APIs are designed for modern interfaces, including REST, JSON, and XML are easily accessible through our Developer Portal, where you can build, test, and explore integrations.
Enhance your data with geographic, demographic, and firmographic insights, along with U.S. property data for advanced enrichment. Melissa supports seamless integration with popular platforms such as Salesforce, Shopify, and more, making data management and governance simple and efficient. Whether you’re focused on data management, data validation, or leveraging our APIs into your website or mobile applications, Melissa helps you unlock the full potential of your data.
Get started with 1,000 complimentary credits! All you need is a Melissa account
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Bouncer
Bouncer - The easiest to use yet the most powerful E-mail Validation and Deliverability Service.
Bouncer is a fortress-like secure (GDPR compliant) Email Verification and Deliverability platform trusted by thousands of companies across 6 continents. Founded in 2017, Bouncer helps businesses improve human-to-human email communication by ensuring every message has the best chance of reaching the inbox.
Bouncer is a technological leader in email verification.
Both list and API verification are top-notch, backed by a zero-downtime policy, industry-leading coverage, and high performance (up to 200,000 verified emails per hour per customer). Beyond verification, Bouncer helps protect signup forms with Shield, automates list hygiene with AutoClean, improves inbox placement with Deliverability Kit, detects risky addresses with Toxicity Check, and connects seamlessly with a growing library of integrations.
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