Address validation API
UK address validation API on Royal Mail PAF data
Check UK addresses against Royal Mail PAF and get back a clean, deliverable address as structured fields, typically in under 50ms. Officially licensed via Royal Mail, with postcode lookup and autocomplete on the same key.
Free trial: 30 lookups a day for 30 days. No card required.
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Sub-50ms response times
Free trial, no card required
What address validation checks
Deliverable or not, before it costs you a parcel
Send an address you already hold and AddressBrain matches it against Royal Mail's Postcode Address File: around 32 million addresses across 1.8 million postcodes, including flats, businesses and new builds.
Matched addresses come back normalised into separate fields: sub-building name, building name or number, thoroughfare, dependent locality, post town and postcode. Anything that does not match a real delivery point can be flagged before it reaches a label, a policy or a KYC check.
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Address validation
Check and normalise addresses you already hold, one at a time or in batch, and flag anything undeliverable before it reaches your warehouse, courier or CRM.
Validation at capture
Stop bad addresses at the form. Autocomplete and postcode lookup only offer real Royal Mail addresses, so what gets saved is already valid.
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Postcode lookup
Postcode in, addresses out. The customer types a postcode, picks their address from the list, and the form fills itself with a validated address.
Data
Royal Mail PAF, officially licensed, kept current.
AddressBrain is a licensed Royal Mail PAF solution, so the licensing question sits with us rather than with you. New-build addresses are included as Royal Mail adds them, and 1.4m UK business names sit in the same index for work and click-and-collect deliveries.
Search on a postcode, a partial address or a business name.
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Sub-building, building name, thoroughfare, post town and postcode as separate fields.
New-build addresses included at no extra cost.
New-build addresses and 1.4m UK business names included.
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Performance and pricing
Sub-50ms responses. Plans from free to 33,000 lookups a month.
Typical UK response times are under 50ms from distributed, auto-scaling infrastructure, so peak trading traffic does not queue behind one database. Plans run from a free trial through nine monthly tiers, £49 for 1,000 lookups to £999 for 33,000, 4.9p down to 3.0p each, with volume pricing above that.
Monthly plans, change or cancel any month.
Overage charged per lookup, or we recommend a better plan.
Free trial: 30 lookups a day for 30 days, no card required.
Volume pricing and annual terms when you need an SLA.
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For developers
A REST API with an OpenAPI spec and a bearer token.
Send the address and your bearer token and get JSON back. No SDK to install and no OAuth handshake, and because the API ships with an OpenAPI spec, any client generator or agent framework can call it as a tool. Create an account, copy the key out of the dashboard, and make the first call.
Authenticate with a single API bearer token, no OAuth handshake.
Free trial includes 30 lookups a day for 30 days. No card required.
Live usage dashboard, so you can watch spend as it happens.
Distributed, auto-scaling architecture, so peak trading traffic does not queue behind one database.
On every plan, including free
What you get out of the box
Sub-50ms UK response times.
Full PAF-formatted address data, including new-build coverage.
Batch and single-lookup validation on the same key.
Start building in minutes
Create a free account and start returning validated UK addresses in minutes.Start with 30 free lookups a day for 30 days. Test environment, full API docs, and support included.
No credit card required. Officially licensed by Royal Mail.
No credit card required. Officially licensed by Royal Mail.