Industry Engine API - The Data City

Access classifications, financials, growth signals, and group structure for UK companies. The REST API exposes the same data that powers Industry Engine — same coverage, same definitions, fresh on the same cadence. Authenticate with a Bearer token, send JSON, get JSON back.

Quickstart

Make your first request in under five minutes.

Authentication

How Bearer tokens work and where to get one.

Errors

The error envelope and status-code matrix.

Rate limits

200 requests per minute, with backoff guidance.

Working with lists

Pagination

returnCount and skip — defaults, maximums, patterns.

Filtering

Build a list with RTICs, CICs, or your own portfolio.

Batching

Bulk endpoints and company-number sets for large lists.

Reference

Every operation is documented under the Endpoints group in the sidebar. Each page includes a live playground — paste your token, fill the parameters, send the request. Base URL:

https://product-api.thedatacity.com/api

All current endpoints are under /v2/.... See Versioning for the policy and Changelog for what’s changed.

For LLMs and agents

The full v2 surface is also available as a single curated text file optimised for LLM context. Paste it into ChatGPT/Claude or feed it to an agent for end-to-end API context in one request.

llms.txt — full API reference (one file)

Endpoint decision tree, request/response shapes, idiomatic patterns. Regenerated on every API deploy.

Last modified on May 25, 2026

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