Bad address data causes failed deliveries, lost sales and avoidable support costs
UK address lookup, autocomplete and validation, officially licensed via Royal Mail, with sub-50ms response times.
500 free lookups, no card required.
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Sub-50ms response times
Free tier, no card required
One wrong address,
and everything
downstream gets messy
A single mistyped address doesn't stay contained.
What starts as one small error at sign-up or checkout turns into failed deliveries, flagged compliance checks and hours of manual admin further down the line. None of this is inevitable, and there's a single API built to stop all three.
Drop-off at the point of capture
Every extra field or typo in a checkout, sign-up or quote
form is a reason for someone to give up before they finish.
form is a reason for someone to give up before they finish.
Costly errors downstream
A bad address becomes a failed delivery, a flagged KYC check, or a mispriced quote, depending on what you do with it.
Engineering hours lost to patchwork fixes
Without a validated address API, teams end up building and maintaining their own checks instead of shipping product.
Built for developers
Get a real address
back in one request
No sales calls, no long onboarding, just an API key and a request. Here's what integrating AddressBrain actually looks like.
Authenticate with a single [API key/bearer token], no OAuth handshake required.
Typical UK response time under 50ms.
Free tier includes 500 lookups, no card required.
Postcode lookup & validation
Stop paying for address data you
can't trust
Bad address data means failed deliveries, re-delivery costs and engineering hours spent writing validation scripts. Look up any UK postcode and get back a full, validated and normalised list of addresses in one call.
Works with full or partial postcodes.
Validates and normalises the data.
Built for internal systems, batch jobs and CRM cleansing.
Includes latitude, longitude and new build data, at no extra cost.
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Fuzzy address matching
Stop rejecting addresses that
are still valid
Not every address comes in clean. Flat 1 or Apartment 1, a typo in the street name, a missing delivery point suffix, AddressBrain will match it anyway and hand back a fully formatted, correct address instead of a failed lookup.
Matches messy or partial addresses that would otherwise fail.
Returns a fully formatted, correct address.
Built on the same delivery point suffix matching AddressBrain already uses internally for order routing.
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Why UK businesses choose AddressBrain
Speed & architecture
Distributed, auto-scaling architecture with each node holding its own data copy. 100% UK postcode coverage across 1.8m postcodes, 32m delivery addresses and 1.4m business names, all matched in under 50ms.
Price & licensing
Officially licensed Royal Mail PAF data, priced for self-serve teams rather than locked into enterprise contracts. Licensing PAF data directly is expensive and time consuming so we include it with no long-term contract.
Developer experience
Stripe-style integration: clean API, clear docs, and sign-up to integrated in minutes. Free tier, no card required.
Trust, powered
by Royal Mail
We’re a Royal Mail company, so compliance and procurement teams can sign off with confidence instead of chasing down where the data comes from. Every lookup runs on the same officially licensed PAF data, not a scraped or unofficial copy.
Built for your
industry
AddressBrain works for any UK business
that needs address lookup and validation.
that needs address lookup and validation.
eCommerce
Autocomplete and validation give you a frictionless checkout, cutting form drop-off and delivery errors.
Logistics
Validating addresses before despatch means fewer failed deliveries, with fewer failed first attempts and re-delivery costs.
Fintech
Fast, accurate address capture makes onboarding smoother by removing a common KYC drop-off point.
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Proptech
AddressBrain is the reliable base layer other property data, like EPC, planning and valuations, is matched against.
Insurance
Accurate point-of-quote validation means fewer mispriced policies and wrongly declined applications.
Start building in minutes
Create a free account and start returning validated UK addresses in minutes. Start off with 500 free lookups, a test environment, full API docs and support included.
No credit card required. Officially licensed via Royal Mail.
No credit card required. Officially licensed via Royal Mail.