A postcode lookup API converts a UK postcode into the full list of addresses registered at that location. Instead of typing four or five address lines, your customer enters a postcode, picks their address, and you capture clean, structured, deliverable data every time.
Why teams choose AutoPostcode
- Official Royal Mail PAF data — 30M+ deliverable UK delivery points
- Fast type-ahead autocomplete that lifts checkout conversion
- No-code WooCommerce & WordPress plugin, plus a clean REST API
- Per-website API keys with full usage logging
- Transparent, volume-based pricing with a free trial
What you can build
Use the API to power checkout and shipping address fields, account registration, CRM data capture, logistics routing and identity workflows. Because results come straight from PAF, every address you store is one a courier can actually deliver to.
How it works
Send a postcode to the lookup endpoint with your website API key and receive a structured list of addresses. When the user selects one, you get the full address broken into named fields ready to save. Add the plugin for a zero-code setup, or call the REST API directly from any stack.
Postcode lookup cluster
Dig deeper with our dedicated guides on the address lookup API, address autocomplete, UK address verification and address validation — or read the full Royal Mail PAF guide.
Frequently asked questions
What is a postcode lookup API?
A postcode lookup API takes a UK postcode and returns the full list of deliverable addresses at that postcode, letting users select their address instead of typing it. AutoPostcode uses official Royal Mail PAF data covering 30M+ delivery points.
How accurate is AutoPostcode?
AutoPostcode is built directly on the Royal Mail Postcode Address File (PAF), the authoritative source of UK addresses, so results are deliverable and kept current.
Can I use it without coding?
Yes. Use the no-code WooCommerce and WordPress plugin, or call the REST API directly for custom integrations.
How much does it cost?
Plans start with a free trial and scale by monthly lookup volume. See the pricing page for current tiers.
Ready to get started?
Add Royal Mail PAF-verified UK address lookup to your site in minutes — start free, no card required.