Real-Time Address Validation Software for SaaS Platforms
Stop bad data before it enters your system. Data8’s address validation API and email validation API give B2B SaaS teams the UK’s most accurate postal data – plus global coverage across 240+ countries.
Trusted by 1,000+ businesses since 2005
of newly-created data records have at least one critical error
Source: Harvard Business Review. Dirty addresses inflate postage costs, trigger failed deliveries, and undermine every downstream workflow that depends on customer location data.
the 1-10-100 rule of data quality cost
Verifying a record at point of entry costs $1. Fixing it after the fact costs $10. Leaving it uncorrected costs $100 per record per year. Validation at entry is the only economically rational strategy.
of data degrades in accuracy every year
Source: Gartner. People move, change jobs, change email providers. Without point-of-entry validation, your database drifts further from reality with every passing month.
2005
20 years of UK data expertise
240+
countries supported globally
99.997%
Address capture uptime over 180 days
1,000+
businesses using Data8
OUR APIs
Two APIs. One integration. Zero bad data.
Both APIs are RESTful, JSON-native, and built for high-throughput SaaS environments. Drop them into your existing stack straight away.
Address Validation API
Validate, standardise, and autocomplete postal addresses in real time using Royal Mail PAF, Ordnance Survey UPRN data, and international postal registries. Eliminate manual correction at every touchpoint — from sign-up to checkout.
- ROYAL MAIL PAF
- AUTOCOMPLETE
- REST / JSON
- OS UPRN
- BATCH MODE
- GDPR SAFE
Email Validation API
Check deliverability, syntax, domain health, and MX records at point of entry. Catch typos, disposable addresses, role-based inboxes, and catch-all domains before they reach your database.
- SYNTAX CHECK
- MS LOOKUP
- TYPO CORRECTION
Try Address Validation for Free
This table shows the relative age and wealth of the local population compared to the country as a whole. A - F indicates the age (A being the youngest, F the oldest), and 1 - 4 indicates the wealth (1 being the wealthiest, 4 being the least wealthy).
| A | B | C | D | E | F | |
|---|---|---|---|---|---|---|
| 1 | ||||||
| 2 | ||||||
| 3 | ||||||
| 4 |
Try Email Validation for Free
Quick Email Validation. Get Started in Minutes
Quickly add Email Validation to your existing web pages with just a few lines of code! Get started in minutes with our jQuery Validate plugin, or get full control in your desktop apps with our powerful API.
<input id="email" />
<script type="text/javascript">
$("form").validate({
rules: {
email: {
required: "Email address is required",
d8val_email: "Invalid email address"
}
}
});
</script>
WHY DATA8
Built for product teams who can't afford data problems
Every feature is designed around one principle: prevent bad data from entering your system in the first place.
Royal Mail PAF - Always Current
Updated monthly with the full Postcode Address File. The UK's authoritative address dataset, licensed directly from Royal Mail.
Type-ahead autocomplete
Reduce form friction and errors simultaneously. As users type, suggest valid addresses instantly - no postcode-first flow required.
Ordnance Survey UPRN linking
Every UK address returned with its unique property reference number — enabling precise geolocation, deduplication, and property-level matching.
99.997% uptime - independently monitored
Address Capture and Email Validation services each recorded 99.997% uptime over the last 180 days, published live on Data8's public status page and monitored by a third-party provider.
GDPR - compliant by design
All validation calls are stateless. No customer data is stored, logged, or retained. UK data centre processing available.
Batch cleansing endpoint
Cleanse existing records at scale. Upload a CSV or call the batch API to validate thousands of addresses in a single request.
Where SaaS teams deploy Data8
From early-stage startups to enterprise platforms, address and email validation APIs deliver measurable ROI wherever customer data enters your product.
User Registration & Onboarding
Validate addresses and emails at sign-up. Reduce bounce rates, prevent duplicate accounts, and start every customer relationship with clean data in your CRM.
E-commerce Checkout
Cut failed deliveries and address-related support tickets. Autocomplete reduces checkout friction, improving conversion while ensuring every order ships to a real address.
CRM & ERP Data Cleansing
Run batch validation against existing records to standardise address formats, remove duplicates, and append UPRNs — without disrupting live operations.
Email Marketing Platforms
Prevent invalid and risky addresses from joining your mailing lists. Protect sender reputation and reduce ESP costs by validating every email at the point of capture.
Field Service & Logistics
Geocoordinate data returned alongside validated addresses integrates directly with routing and dispatch systems, eliminating manual location lookups.
InsurTech & FinTech KYC
UPRN-linked address verification supports identity verification and fraud prevention workflows where property-level precision is a regulatory requirement.
FAQ
Common questions about address validation software
Answers to the questions SaaS product and engineering teams ask most often.
What is address validation software?
Address validation software checks postal addresses against authoritative reference datasets – such as Royal Mail PAF in the UK – and confirms whether an address is real, correctly formatted, and deliverable. Modern solutions expose this capability via a real-time validation API that integrates directly into web forms, mobile apps, and backend services. The goal is to prevent bad addresses from entering a system at the point of entry, rather than attempting to clean them retrospectively.
How does a real-time address validation API work?
When a user types into an address field, the front end sends partial input to the validation API via an HTTP request. The API queries a licensed postal database, returns matching address candidates within milliseconds, and the form presents them as autocomplete suggestions. The user selects their address, which is returned in a standardised, validated format. For email validation, the API performs syntax checking, MX record lookups, and deliverability scoring in a single call before the form is submitted.
What is the difference between UK and global address validation?
UK address validation uses Royal Mail’s Postcode Address File (PAF) and Ordnance Survey UPRN data — the most authoritative datasets available for British addresses, updated monthly. This delivers accuracy above 99%. Global address validation covers international addresses using regional postal databases across 240+ countries, but depth of coverage varies significantly by country. For businesses with a predominantly UK customer base, a UK-first provider like Data8 offers materially higher accuracy than a global-first competitor. For international-first businesses, the global mode handles the breadth required.
Is the Data8 API GDPR compliant?
How long does it take to integrate the address validation API?
What is a UPRN and why does it matter for SaaS?
GET STARTED
Clean data starts at the point of entry
Join 1,000+ UK businesses using Data8’s address validation software. Free trial includes 100 free credits – no credit card required.