Audience

Organizations wanting a tool to improve their address lookup and form validation processes

About 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.

Other Popular Alternatives & Related Software
Postcodes.io
Postcodes.io
Postcodes.io is an open source postcode lookup API and geocoder for the United Kingdom that lets developers search, validate, and geolocate UK postcodes while retrieving detailed administrative and geographic information. The API can look up complete postcode records, reverse geocode latitude and longitude coordinates to nearby postcodes, search by partial postcode strings, find nearest postcodes to a location, and query outward codes and places. Responses can include coordinates, regions, administrative districts, counties, wards, parishes, parliamentary constituencies, statistical areas, health geographies, rural-urban classifications, and other associated codes and attributes. Bulk reverse geocoding allows large sets of coordinates to be converted into their nearest postcode areas, while autocomplete and validation methods simplify postcode entry and verification workflows.
Learn more about Postcodes.io
Hopewiser
Hopewiser
Hopewiser is a leading provider of address validation, data cleansing, and data quality services, offering solutions designed to improve the accuracy and efficiency of business operations. The platform uses real-time data from sources like the Royal Mail Postcode Address File (PAF) to validate addresses, ensuring that businesses can confidently deliver to the right customers. Hopewiser also provides tools for email address validation, bank account verification, and data hygiene services, helping organizations reduce errors, prevent fraud, and enhance customer communication. Its offerings are available through cloud-based tools, standalone software, and professional consulting services.
Learn more about Hopewiser
findAddress.io
findAddress.io
findAddress.io is a fast, reliable UK address lookup and postcode validation API built for developers and businesses that need accurate address data without enterprise-level complexity or cost. Our RESTful JSON API provides postcode lookup, address autocomplete and real-time address validation, helping improve form completion rates, reduce address errors and capture clean, structured UK address data at the point of entry. Designed for modern web applications, findAddress.io integrates easily into checkout flows, registration forms, CRMs and internal systems using JavaScript, PHP, Node.js and other common stacks.
Learn more about findAddress.io
Web APIs by Melissa
Web APIs by Melissa
4.8 out of 5 stars (4 Ratings)
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
Learn more about Web APIs by Melissa

Pricing

Starting Price:
£27 per 500 credits
Pricing Details:
Start with a free trial, then pay-as-you-go or pay monthly. Credit packs start at £27, and monthly plans start at £45. Volume discounts and charity/public sector pricing available.
Free Trial:
Free Trial available.

Integrations

API:
Yes, Postcoder offers API access
See Integrations

Ratings/Reviews

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Company Information

Allies Computing
Founded: 1987
United Kingdom
postcoder.com

Videos and Screen Captures

Address autocomplete

Address autocomplete

Address autocomplete Email address validation OTP verification Bank account validation Mobile number validation Postcoder Screenshot 6
Other Useful Business Software
Patching and Endpoint Management for Under $1/Endpoint Icon
Patching and Endpoint Management for Under $1/Endpoint

OS and third-party patching, vulnerability insights, and remote control included

Splashtop AEM gives IT teams automated patching, monitoring, and unattended remote access for Windows and macOS. No long setup, no paying extra for key features.
Start Free Trial

Product Details

Platforms Supported
Cloud
Training
Documentation
Live Online
Support
Phone Support
24/7 Live Support
Online

Postcoder Frequently Asked Questions

Q: What kinds of users and organization types does Postcoder work with?
Postcoder works with these users and organization types: Mid Size Business, Small Business, Enterprise, Freelance, Nonprofit, Government, and Startup.
Q: What languages does Postcoder support in their product?
Postcoder supports these languages: English.
Q: What kind of support options does Postcoder offer?
Postcoder offers support via phone support, 24/7 live support, and online.
Q: What other applications or services does Postcoder integrate with?
Postcoder integrates with: C#, Contact Form 7, CSS, Divi, Elementor, Formidable Forms, Forminator, Gravity Forms, Gutenberg Technology, HTML, JavaScript, Ninja Forms, Node.js, PHP, Python, Wix, and WP Fluent Forms.
Q: Does Postcoder have an API?
Yes, Postcoder has an API.
Q: What type of training does Postcoder provide?
Postcoder provides training in the form of documentation and live online.
Q: Does Postcoder offer a free trial?
Yes, Postcoder offers a free trial.
Q: How much does Postcoder cost?
Pricing for Postcoder starts at £27 per 500 credits.
Q: What pricing for support is available for Postcoder?
Postcoder offers support included with purchase.
Q: What pricing for training is available for Postcoder?
Postcoder offers training included with purchase.

Postcoder Product Features

Address Verification

Address Validation Supported
Autocomplete Supported
Automatic Formatting Supported
Data Cleansing Supported
Data Verification Supported
Geolocation Supported
Metadata Management Supported
Reporting / Analytics Supported
Search / Filter Supported
Data Discovery Not Supported
Data Quality Control Not Supported
Geographic Maps Not Supported
Page Already Claimed. Claim Again?