Bad address data quietly costs UK businesses money — failed deliveries, returned post, carrier surcharges and dirty CRM records. AutoPostcode's UK address validation API fixes it at the point of entry, checking every address against the official Royal Mail Postcode Address File.
Why teams choose AutoPostcode
- Official Royal Mail PAF data — 31M+ UK delivery points
- Real-time validation and standardisation via one REST call
- No-code WooCommerce & WordPress plugins
- Per-website API keys with full usage logging
- Transparent, volume-based pricing and a free trial
- UK-first and UK-hosted — GDPR-friendly, no enterprise sprawl
AutoPostcode vs legacy providers
| AutoPostcode | Legacy suites | |
|---|---|---|
| Data source | Royal Mail PAF | PAF (often bundled) |
| Pricing | Transparent, volume-based | Quote-based / opaque |
| Integration | REST API + no-code plugin | SDK-heavy |
| Free trial | Yes, no card | Often sales-gated |
| UK focus | UK-first | Global, complex |
Simple to integrate
Validate an address with a single authenticated request:
curl "https://api.autopostcode.com/v1/validate?postcode=SW1A1AA" \
-H "x-api-key: YOUR_API_KEY"Get started free
Grab a free API key and validate your first addresses today, or read the postcode lookup API and address autocomplete API docs. Comparing options? See AutoPostcode vs Loqate.
Frequently asked questions
What is a UK address validation API?
A UK address validation API checks and standardises addresses against an authoritative source — for AutoPostcode that's Royal Mail's Postcode Address File (PAF) covering 31M+ UK delivery points. It confirms an address exists, corrects formatting and returns clean, structured fields.
How accurate is AutoPostcode's address validation?
AutoPostcode validates against official Royal Mail PAF data, so results reflect the definitive list of UK addresses. That's the same source used by enterprise providers like Loqate and Ideal Postcodes.
How much does the address validation API cost?
Pricing is transparent and volume-based with a free trial and no card required. There's a free tier to test, then predictable pay-as-you-grow pricing — typically well below legacy enterprise suites.
How do I integrate the API?
Call a single REST endpoint with your API key, or drop in the no-code WooCommerce/WordPress plugin. Most teams are live in under an hour.
Ready to get started?
Add Royal Mail PAF-verified UK address lookup to your site in minutes — start free, no card required.