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Address checking API

Check and verify UK addresses in real time against Royal Mail PAF data to cut failed deliveries and bad data.

No card required · Royal Mail PAF-verified data

Trusted UK address intelligence

31M+
UK addresses
1.8M
Postcodes
99.9%
Uptime
PAF-verified address lookup
Fast REST API & no-code plugins
GDPR-friendly, UK-hosted

Address checking validates that an address exists and is correctly formatted before you accept it. Explore how our verification and validation APIs work.

Price beat guarantee

We'll beat any like-for-like UK address lookup price

Send us your current quote or invoice and we'll come back the same working day with a better price — plus free migration and integration support.

  • Beat any like-for-like UK quote, monthly or annual
  • Free migration + hands-on integration support
  • No setup fees, no lock-in, cancel any time

Ready to get started?

Add Royal Mail PAF-verified UK address lookup to your site in minutes — start free, no card required.