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Guide Explains How to Access UK Company Data Through Companies House API

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The UK's Companies House publishes a free, real-time Public Data API covering company profiles, officers, persons with significant control, filings and charges. The guide walks readers through registering on the Developer Hub and creating a live application with an API key. It explains that authentication uses HTTP Basic with the key as username and a blank password, and notes a limit of 600 requests per five minutes. Example requests are shown, such as retrieving a company profile by number, and endpoints for searching companies, officers and disqualified officers are outlined. The article also covers pagination for bulk queries and mentions a third-party tool the author develops for handling pagination, rate limits and export.

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