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Fast, faultless forms

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.

Trusted by leading organisations worldwide
  • NHS customer logo
  • SKY customer logo
  • Kentucky Fried Chicken customer logo
  • Royal National Lifeboat Institution customer logo
  • Kwik Fit customer logo
  • USwitch customer logo
  • Halfords customer logo
  • Go Ape logo
  • Rightmove customer logo
  • Smyths Toys Superstores customer logo
  • Legal and General customer logo
  • Pizza Hut customer logo
One API, multiple features

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.

Global data, global scale

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.

Designed for developers

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 https://ws.postcoder.com/pcw/PCW45-12345-12345-1234X/email/ada%40example.com?format=json
{
	"valid": true,
	...
}
GET https://ws.postcoder.com/pcw/PCW45-12345-12345-1234X/mobile/07500%20123456?format=json
{
	"valid": true,
	"on": true,
	"networkname": "UK - VODAFONE",
	...
}
GET https://ws.postcoder.com/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
	}
]
Simplified admin

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.

Powerful customer stories

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