Sub-20ms UK Companies House API: Address Sanitization, KYB & Balance Sheet Extraction

James — Fri, 16 Oct 2026 19:54:43 +0000

If you’ve ever built against Companies House data, you know the pain:

Rate-limit dropouts (HTTP 429 Too Many Requests)
ALL-CAPS addresses and missing GPS coordinates
Dropped leading zeroes on Scottish company numbers
Balance sheet PDFs you can't easily query or render in browser apps

So I built a fix. 😁

The sub-20ms API and web demo are live in production today!

The live website demo is already running smoothly and handling real-time lookups with sub-20ms speeds.

Here is what it handles in a single request:

Address Normalization: Cleans raw strings into Title Case and attaches verified WGS-84 GPS coordinates.
Directors KYB: Categorizes active vs. resigned board officers instantly.
Automated Vision Extraction: Scans filing PDFs and parses balance sheet metrics into clean JSON.
CORS PDF Streaming: Proxies official filing PDFs directly into web portals and iFrames.

The platform speaks for itself, so check out the live demo and test out the sandbox (no API key needed):

👉 Live Sandbox & Demo

Laravel developers can pull the open-source wrapper directly:

jamesforsyth/laravel-uk-kyb-edge on Packagist

Building a Sub-20ms UK Companies House & Financial Vision API

James — Sat, 10 Oct 2026 09:52:28 +0000

Connecting to government registries often comes with common pain points: rate-limit cascades (HTTP 429 errors), messy non-standardized address strings, missing GPS coordinates, and unstructured balance sheet PDFs.

To solve this, I built the UK Business Data, Address Sanitizer & Financial Intelligence API—a high-speed, enterprise-grade global proxy that standardizes company records, retrieves live board officers, and extracts financial metrics from filing PDFs into clean JSON.

What The API Solves

Smart Address Normalization & Geocoding
Messy registered office addresses are automatically reformatted into Title Case and enriched with verified WGS-84 GPS coordinates (latitude, longitude, and administrative district).
Automated Balance Sheet Extraction
Instead of forcing analysts to manually read filing PDFs, the /financials endpoint passes document streams to custom Vision Models to parse unstructured balance sheets into strictly-typed JSON schemas.
High-Speed Document Proxy Streaming
The /document endpoint proxies Companies House S3 buckets with CORS headers injected, enabling direct PDF rendering inside web portals and iFrames.
Zero Rate-Limit Dropouts
An intelligent, distributed 24-hour caching layer absorbs upstream rate surges to eliminate 429 dropouts and deliver sub-20ms response times.

Native Laravel Package

If you're building in PHP/Laravel, you can install the official open-source package directly:

composer require jamesforsyth/laravel-uk-kyb-edge

GitHub: James-2050/laravel-uk-kyb-edge

Packagist: jamesforsyth/laravel-uk-kyb-edge

Try the Live Sandbox

You can test the endpoints live directly in your browser without needing an API key:

👉 Live Sandbox & Demo: uk-business-sanitizer-demo.jamesforsyth1829.workers.dev