Registrum

Hey IH,

I built [Registrum](https://registrum.co.uk) — a dependable REST API that wraps the UK Companies House API and gives you:

- Structured financials — turnover, net assets, profit/loss, employees, all in actual GBP (not iXBRL hell)

- Director networks — one call to traverse 2 degrees of board connections, finding related entities you'd never spot manually

- Intelligent caching — 24h company data, 7-day financials, stale-while-revalidate during CH outages

- Fuzzy company search — name → enriched profile in one call, no second round-trip

Where it is now

- API is live and in production

- Free tier: 50 calls/month, no credit card

- Pro tier: 2,000 calls/month at £49/mo

- Beta offer: use code BETA3 at checkout for 3 months free on Pro — first 20 sign-ups

Tech stack

- FastAPI (Python) on Railway

- Next.js website on Vercel

- Companies House API as the upstream data source (open data under OGL v3)

Who it's for

PropTech companies doing landlord due diligence, RegTech / KYB compliance teams, and sales intelligence tools enriching CRM leads with UK company data.

Happy to answer questions about the data, the API design, or the infrastructure. The response shape is fully documented at [api.registrum.co.uk/docs](https://api.registrum.co.uk/docs).

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Feedback welcome — especially from anyone doing KYB or company data enrichment. What fields are you missing?

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