Postcoder is the API for address lookup and form validation
Create a quick and accurate data capture experience on your website and app. Eliminate unnecessary form fields. Reduce data entry errors.
A fully integrated set of features for your customer onboarding forms
Postcoder brings together everything you need to create forms that people can fill-in quickly and accurately. Add one or more features to your existing form and watch your conversion rates and data quality improve.
Address lookup
Capture addresses using postcode lookup or address autocomplete.
Learn more ➜Mobile validation
Capture valid mobile phone numbers from your customers.
Learn more ➜OTP verification
Protect your customer accounts with OTP SMS verification.
Learn more ➜Bank validation
Verify bank accounts for direct debits and money transfers.
Learn more ➜Email validation
Capture valid email addresses from your customers.
Learn more ➜
An award-winning API with top-tier performance, easy admin and great support
Customers love Postcoder according to independent user reviews on the world's most trusted software marketplace. Start a free trial and find out what you've been missing.
Simple, straightforward and easy to integrate
Customer onboarding at scale
Postcoder delivers the scale you need for global commerce. Approaching 1 million requests per day, it delivers lightning quick response times and supreme reliability wherever your customers are based.
- 244
countries for address lookup
- 700k+
API requests per average day
- 99.99%
API uptime
Integrate features quickly with one easy-to-use API
Reduce development time using Postcoder. We obsess over the vast array of global data sources, daily refresh cycles and network validation protocols to provide you with a unified set of validation features in one API.
GET /pcw/PCW45-12345-12345-1234X/email/ada%40example.com?format=json{ "valid": true, ... }GET /pcw/PCW45-12345-12345-1234X/mobile/07500%20123456?format=json{ "valid": true, "on": true, "networkname": "UK - VODAFONE", ... }GET /pcw/autocomplete/find?apikey=PCW45-12345-12345-1234X&query=123%20foxg&country=uk&format=json[ { "id": "10101010", "type": "ADD", "summaryline": "123 Foxglove Close", "locationsummary": "Weybourne, Holt, Norfolk, NR25 7HG", "count": 1 }, { "id": "20202020", "type": "ADD", "summaryline": "123 Foxglove Lane", "locationsummary": "Biddenden, Ashford, Kent, TN27 8BT", "count": 1 }, { "id": "30303030", "type": "ADD", "summaryline": "123 Foxglove Road", "locationsummary": "Winchburgh, Broxburn, West Lothian, EH52 6FE", "count": 1 } ]
Buy credits, check usage and configure security with ease
Use the feature-rich admin area to set up and manage your account. It is natively mobile and desktop-friendly so whether you're updating a setting on the go or doing a deep-dive at your desk, it will be the same seamless experience. It supports dark mode too.
Postcoder is trusted by over 9,000 organisations of all sizes
Postcoder helps organisations in the UK and worldwide achieve measurable improvements in their form conversions and data quality. After integrating Postcoder, many of them report increased onboarding numbers, faster form completion, and a surge in quality leads. Postcoder captures contact details you can rely on.
Postcoder has been great; there has been a noticeable quality increase in our campaigns. In some the pickup rate went from 30% to 60-70%!
Daniel Jones, Lead Pronto
