GoAddress
GoAddress is a UK postcode and address lookup API designed to deliver fast, accurate address data in seconds. It allows developers to search by postcode or full and partial address text using simple REST endpoints. The API returns clean, structured address data that is ready for use in forms, databases, and applications. GoAddress is built for production use cases such as checkout flows, customer onboarding, and internal systems. Address data is refreshed daily to ensure accuracy and reliability. Secure API key authentication and high availability make it suitable for business-critical applications. Trusted by thousands of developers, GoAddress offers a quick setup with no credit card required for the free tier.
Learn more
Data8
Data8 offers a comprehensive suite of cloud-based data quality solutions designed to ensure your data is clean, accurate, and up-to-date. Our services encompass data validation, cleansing, migration, and monitoring, tailored to meet specific business needs. Data validation services include real-time verification tools for address autocomplete, postcode lookup, bank account validation, email verification, name and phone validation, and business insights, all aimed at capturing accurate customer data at the point of entry. Data8 helps improve B2B and B2C databases by offering appending and enhancement services, email and phone validation, data suppression for goneaways and deceased individuals, deduplication and merge services, PAF cleansing, and preference services. Data8 is an automated deduplication solution compatible with Microsoft Dynamics 365, designed to dedupe, merge, and standardize multiple records efficiently.
Learn more
Postcoder
Postcoder is an API from Allies Computing that gives developers a single endpoint for verifying and validating customer contact data at the point of entry. Used across sectors from healthcare to retail, it's built to drop into checkout, onboarding, and account creation flows with minimal friction.
What's included:
Address lookup – Postcode, partial address, or coordinate-based search across Royal Mail PAF, Ordnance Survey AddressBase, and 249 countries worldwide.
Bank validation – Real-time sort code and account number verification, with branch data and direct debit eligibility returned in the response.
Email validation – Domain and formatting checks with disposable address detection.
Mobile validation – Live network status checks across 200+ countries.
OTP verification – SMS-based one-time password delivery.
Clear documentation, multi-language sample code, and a straightforward REST structure mean integration is quick. 30 day free trial with no credit card required.
Learn more
Hopewiser
Hopewiser is a leading provider of address validation, data cleansing, and data quality services, offering solutions designed to improve the accuracy and efficiency of business operations. The platform uses real-time data from sources like the Royal Mail Postcode Address File (PAF) to validate addresses, ensuring that businesses can confidently deliver to the right customers. Hopewiser also provides tools for email address validation, bank account verification, and data hygiene services, helping organizations reduce errors, prevent fraud, and enhance customer communication. Its offerings are available through cloud-based tools, standalone software, and professional consulting services.
Learn more