Ideal Postcodes

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.

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.