The UK company data API

Companies House gives you the register: profile, officers, PSC statements and a list of filings, with the accounts themselves as PDF and iXBRL documents you have to parse. This API gives you the register plus the parts you would otherwise build — accounts parsed into figures and ratios, shareholdings reconstructed from share allotments, group structure resolved, and search by what a company actually does rather than by name. Same underlying public data, none of the pipeline.

The register holds about 17 million UK companies including dissolved ones, of which roughly 5.8 million are active. Lookups by company number work across the register. Search covers the active register by name, and the 1.15 million active companies with a verified website by what they do.

The registry layers — profile, officers, PSCs, filings and charges — are refreshed daily from Companies House. Parsed accounts follow within a day of the filing appearing. Enrichment layers such as the business profile are rebuilt on a rolling schedule.

Every call costs a fixed number of credits, published per endpoint: registry layers cost 1, ownership and parsed accounts cost 2, a live news lookup costs 3. A search costs 1 credit however many companies it matches. Errors, no-data responses and the credit-balance endpoint are always free, and the x-ct-credits-charged header shows what each response actually cost.

Every key starts on the free plan: 1,000 credits a month, no card required. Paid plans are flat monthly prices for a bigger allowance — Starter is £29 for 10,000 credits, Growth is £99 for 50,000 credits, Scale is £299 for 250,000 credits — each per key, per UTC month, shared across the REST API and the MCP server. There is no overage billing, and errors, no-data responses and rate-limited requests are never charged. Need more than 250,000 credits a month? Talk to us.

It comes back as null, never as a zero. Most small UK companies are not required to publish a profit and loss account, so a null turnover on a micro-entity is the correct answer rather than a gap. When a whole layer does not exist — no accounts filed yet, no verified website — you get an explicit no_data response, and it costs nothing.

Yes. The underlying registry data is public information published by Companies House, and your plan covers using it inside your own product, CRM or models. Redistributing the raw dataset as a competing data feed is not covered — talk to us if that is what you need.

Requests are rate limited per key at a level well above normal integration traffic, and a 429 is never charged. Your monthly credit allowance, not the rate limit, is the thing that bounds a large batch — check /account/credits before you start one.

No. The MCP server runs on the same API key and draws from the same allowance, so a tool call costs exactly what the equivalent REST call costs. There is no second price list.