What you get back
A singlePOST request returns:
| Field | What it is |
|---|---|
| RTICs | Real-Time Industrial Classifications — The Data City’s proprietary codes that classify companies by what they actually do, updated continuously. |
| RSICs | Real-time SIC codes — SIC codes refined with live data rather than the static codes on Companies House. |
| RNAICs | Real-time NAICS codes — the North American industry classification equivalent, built the same way as RSICs. |
| SICs | Standard Industrial Classification codes — the statutory UK codes registered at Companies House. |
| Similar companies | Companies with comparable business activities, ranked by similarity score. |
Who it’s for
Use this API when you need to classify companies programmatically — for lead enrichment, portfolio tagging, market sizing, or compliance screening.How to get started
Quickstart
Sign up and classify your first company in under five minutes.
Authentication
OAuth2 password flow — get a JWT, use a Bearer header.
Errors
Every error code, what it means, and what to do about it.
Rate limits & quotas
Free-tier usage quota and per-minute rate limits.
Base URL
/api/v1. The interactive playground on each endpoint page lets you paste your token and send live requests.