Developer Documentation

Integrate ePostcode's powerful address lookup APIs into your applications. Choose between modern REST or traditional SOAP interfaces.

API Overview

Choose the API that best fits your technical stack and requirements

REST API

Recommended

Modern, fast, and easy-to-use RESTful API with JSON responses. Perfect for web applications, mobile apps, and modern backend systems.

JSON responses
RESTful architecture
High performance
Modern authentication
Easy integration

View REST API Docs

SOAP API

Legacy

XML-based web service for enterprise systems and legacy applications. Full WSDL support for automatic client generation.

XML responses
WSDL support
Enterprise-ready
.NET friendly
Legacy compatibility

View SOAP API Docs

Quick Start Guide

Sign up for a free account at portal.epostcode.com
Get your API key from the Manage Keys section
Choose REST API (recommended) or SOAP API
Follow the documentation and code examples
Test your integration and deploy!

Security & Authentication

Master Key vs API Keys:

Master Key: Used for account administration only (not for API calls)
API Keys: Required for all REST and SOAP API requests
Generate multiple API keys for different applications
IP and domain whitelisting available
Rate limiting and usage monitoring

Need Help?

Our support team is here to help you integrate ePostcode APIs

Email Support Developer Portal Contact Us