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Frictionless customer onboarding with real-time data validation
Verify addresses, emails and mobile numbers instantly to reduce drop-off and prevent fraud from the very first interaction.
The hero includes a visual product demo...
The cost of a poor onboarding experience
A customer types their address incorrectly. Your welcome email bounces. Their first order goes to the wrong street. By the time you find out, they've already left a bad review.
Most of these problems start at the same place: a sign-up form that accepts whatever input it's given. Postcoder validates contact details at the point of entry, so bad data doesn't make it into your system in the first place.
Typical onboarding mistakes:
Customers typing addresses manually introduce errors that cause deliveries to fail
Invalid or disposable email addresses mean welcome emails and order confirmations never arrive
Unverified mobile numbers make SMS communications and two-factor authentication unreliable
Fraudulent accounts are easier to create when contact details go unchecked
How can Postcoder help?
Postcoder validates contact details as customers fill in your form, so only clean, accurate data enters your system.
Rather than asking customers to type out their full address manually, Postcoder's address lookup lets them find it in a few keystrokes. Email and mobile validation happen silently in the background, flagging problems before the form is submitted. And if you need to confirm a customer's identity at sign-up, OTP verification sends a one-time passcode directly to their phone.
The result is an onboarding flow that feels effortless to the customer while producing records you can rely on.
What is Postcoder?
Postcoder is a multi-feature API you can integrate into your website or app quickly and easily using pre-built integrations, sample code and API reference, all within clear and well-structured docs. You can be up and running in minutes with a free trial, and Postcoder's support specialists are always on hand if you need help.
Your onboarding toolkit
Address lookup
Customers find their address from a postcode or as they type the first line of their address. Validated, structured data enters your system automatically. Includes Multiple Residence and Not Yet Built data as standard, so customers in student flats or new builds can find their addresses just as easily as anyone else.
Learn more about address lookupEmail validation
Check email addresses are valid and deliverable at the point of entry. Disposable and role-based addresses are flagged before they reach your database.
Learn more about email validationMobile validation
Confirm mobile numbers are real, correctly formatted and active on a network before they are saved to your records.
Learn more about mobile validationOTP verification
Send a one-time passcode by SMS to confirm a customer's identity at sign-up. Simple to add to your onboarding flow, and a meaningful deterrent to fraudulent account creation.
Learn more about OTP verification
What our customers say
"Previously we had issues with addresses being inputted incorrectly. Postcoder has solved this problem, meaning less time wasted sorting it out manually and parcels being delivered wrongly."
H.E. Brand Product Manager / G2 review
"It ensures that the addresses our customers enter are correct and standardised. This has drastically cut down on errors and improved our customer satisfaction."
Niamh K. Head of Marketing and Digital Transformation / G2 review
"The auto complete address allows customers to easily checkout by reducing any friction on the address step. We rarely have customer queries or complaints around postcodes or addresses not found or missing."
Kevin R eCommerce Manager / G2 review
"Postcoder ensures that all the address data, the mobile number and the email addresses that our customers give us are correct. It really speeds up the process for our customers."
Julie Taylor Operations Director / Barrhead Travel
Award-winning API with top performance, easy admin and great support
Businesses rate Postcoder 4.7 stars out of 5 on the world's most trusted software marketplace.
