WHAT YOU GET
Full Address Lookup
30M+ Royal Mail PAF delivery addresses returned for any valid UK postcode — street, locality, town, county and more.
Geocoding Coordinates
Rooftop-accurate latitude and longitude for every address — ready to pin on Google Maps, Mapbox, or any mapping service.
UPRN & Property Data
Unique Property Reference Numbers (UPRN) plus administrative area, ward, district, and constituency data included in every response.
Daily Updated Dataset
Sourced from Royal Mail PAF with daily updates — new builds, address changes, and deletions reflected within 24 hours.
Outcode & Partial Lookup
Query by full postcode or outcode (e.g. SW1A) to return all addresses in a postal district — ideal for coverage checks.
Simple REST API
Clean JSON responses, no XML, no SOAP. One GET request returns everything. SDKs and code examples for Node.js, Python, PHP, and more.
Address Validation
Instantly validate whether a postcode exists and return its canonical form — reduces form errors and improves data quality.
GDPR Compliant
All data is processed in UK/EU infrastructure. No personal data is stored from API requests. Fully GDPR compliant by design.
WHY CHOOSE APITIER?
Powered by Royal Mail PAF — the most authoritative UK address database covering 30M+ delivery addresses across 1.8M active postcodes. Not scraped, not stale.
Every address comes with precise latitude and longitude coordinates. Drop pins on Google Maps, Mapbox, or Leaflet instantly — no extra geocoding step needed.
Let customers find their address in two keystrokes. Autocomplete postcode → select address dramatically reduces form abandonment and delivery failures.
Access Unique Property Reference Numbers (UPRN) for every address — essential for property tech, utilities, insurance, and any app that needs a persistent property ID.
Daily synchronisation with Royal Mail PAF means new builds, renamed streets, and deleted addresses are reflected within 24 hours — not months.
All API traffic is processed within UK/EU infrastructure. No personal data is retained from requests. Trusted by businesses handling sensitive customer data.
GET STARTED
Sign up with just an email address — no credit card required. Your API key is ready instantly with 20 free lookups included.
Free Sign UpMake your first API call in minutes. Use our interactive test console, copy-paste code examples in Node.js, Python, PHP, or cURL, and explore the full JSON response.
View DocsWhen you are ready to go live, purchase a credit bundle starting from £9. Credits are valid for a year — no monthly fees, no subscriptions, no surprises.
View PricingUSE CASES
From checkout forms to property platforms, the Postcode Lookup API adapts to your workflow.
Let shoppers find their full delivery address from just a postcode. Reduce form errors, cut abandoned carts, and ensure first-time delivery success.
Retrieve UPRN, address, and geolocation for any UK property. Power property search, valuation tools, and portfolio management systems.
Validate and enrich delivery addresses before dispatch. Reduce failed deliveries and optimise last-mile routing with precise coordinates.
Ensure patient records contain valid, standardised UK addresses. Improve data quality across care systems and reduce admin overhead.
Enrich contact records with structured address data, geocoordinates, and administrative districts for better segmentation and regional targeting.
Instantly check whether a postcode falls within your service area. Automate eligibility checks for broadband, energy, and utilities sign-ups.
Browse by Postcode District
Explore addresses, geocoordinates, and Royal Mail PAF data for any UK postcode district. Each page includes a live lookup widget covering all 30M+ UK addresses — no API key needed for browsing.
UK PostCode API — Separate Pricing
UK PostCode API Pricing
The UK PostCode API uses its own credit system, separate from the shared credit wallet. Choose Pay As You Go for flexibility or a Subscription for predictable costs.
Option 1
Pay As You Go
Buy bulk lookup credits upfront. Never runs out mid-month — perfect as a fallback for bursty traffic.
Bulk credits — purchase once, use any time
Plans from £8 for 200 lookups
Solid fallback for bursty traffic
Find by Postcode, Address, UDPRN
Address Autosuggest API
Developer portal & API docs
SLA agreement
Option 2
Subscription
Monthly subscription with a higher allowance per £. Best value for steady, high-volume UK address lookups.
Lower per-lookup cost vs PAYG
Monthly subscription — predictable billing
Stripe billing portal + invoices
Ideal for steady, high-volume traffic
Find by Postcode, Address, UDPRN
Address Autosuggest API
Developer portal & API docs
SLA agreement
READY TO BUILD?
20 free lookups included — no credit card required. Your first API response in under 2 minutes.
Pay As You Go from £9 · No subscription · Credits valid for 1 year
Each response includes the full list of Royal Mail PAF addresses for the postcode — including building name, sub-building, street, locality, post town, county, and country. Additionally, you receive latitude/longitude geocoordinates, the UPRN (Unique Property Reference Number), administrative data (ward, district, constituency), and the eastings/northings grid reference.
The dataset is synchronised with Royal Mail PAF on a daily basis. New builds, address changes, and deletions are reflected within 24 hours, keeping your data accurate for fast-moving residential and commercial developments.
Yes. You can query by the outcode (the first part of a postcode, such as SW1A or M1) to retrieve all addresses within that postal district — useful for coverage checks, delivery zone mapping, and area-based filtering.
Yes. All API traffic is processed within UK/EU infrastructure. No personal data is stored from API requests. The API returns publicly available Royal Mail address data only — making it safe to use in regulated industries such as healthcare, finance, and insurance.
Register for free — no credit card required. You receive an API key instantly with 20 free lookups per month to test and integrate the API into your application before purchasing a paid plan.
Make a single GET request to https://api.apitier.com/postcodes/{postcode}?x-api-key=YOUR_KEY. The response is a clean JSON array of matching addresses — no XML, no SOAP, no complex setup. Code examples for Node.js, Python, PHP, and cURL are available in our documentation.
All paid plans are Pay As You Go — you purchase a credit bundle that is valid for one year. There are no monthly subscriptions, no auto-renewals, and no contracts. Plans start from £9 for 9,000 lookups, scaling up to £99 for 99,000 lookups.
The Unique Property Reference Number (UPRN) is a persistent identifier assigned to every addressable location in the UK by Ordnance Survey. It enables you to link address records across datasets — essential for property tech, utilities, insurance, and public sector applications that need a stable property ID that doesn't change when a street is renamed.