A postcode lookup API turns a UK postcode into a list of deliverable addresses so customers select rather than type. The market includes Loqate, GetAddress, Ideal Postcodes, the free postcodes.io, CraftyClicks, Experian and AutoPostcode. They differ most on data source, integration and price.
How to choose
| Criterion | Why it matters |
|---|---|
| Data source | Royal Mail PAF is the authoritative UK source. Non-PAF datasets can drift out of date. |
| Integration | A no-code plugin saves days versus a raw API for non-developers. |
| Pricing | Predictable, volume-based pricing avoids bill shock as you grow. |
| Per-site keys | Scoped, revocable keys keep multi-site usage, billing and logs clean. |
| Logging | Per-lookup logs let you audit usage and tie it to orders. |
Where AutoPostcode fits
AutoPostcode is built directly on Royal Mail PAF, ships a no-code WooCommerce and WordPress plugin plus a REST API, issues per-website keys, logs every lookup, and starts with a free trial scaling by volume. Compare head-to-head: vs Loqate, vs GetAddress and vs Ideal Postcodes.
Alternatives in detail
Read our deep-dives on the main Loqate, GetAddress.io, Ideal Postcodes, postcodes.io, CraftyClicks and Experian address alternatives.
Frequently asked questions
What is the best postcode lookup API in the UK?
The best choice depends on your needs, but the key criteria are official Royal Mail PAF data, easy integration, transparent pricing and good logging. AutoPostcode combines PAF accuracy, a no-code WooCommerce/WordPress plugin, per-website keys and a free trial.
What should I compare?
Compare data source (PAF-backed or not), integration effort, pricing model and volume tiers, per-site key management, and usage logging.
Is there a free option?
postcodes.io is free and open but not PAF-backed; AutoPostcode offers a free trial on PAF-backed data, then scales by volume.
Ready to get started?
Add Royal Mail PAF-verified UK address lookup to your site in minutes — start free, no card required.