
Real-time alerts on UK company register changes.
RegisterWire API is a free Business API that requires apiKey authentication, is served over HTTPS and does not support CORS, so it should be called from a server.
Guides and API reference for RegisterWire: quickstart, webhooks vs polling, and the full interactive endpoint reference.
Details from registerwire.uk.

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Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
GTM enrichment, lead generation, email verification, and company signals
Search businesses and points of interest by city, deduplicated with a coverage report
The RegisterWire API is provided by RegisterWire (registerwire.uk). Guides and API reference for RegisterWire: quickstart, webhooks vs polling, and the full interactive endpoint reference.
Yes. The RegisterWire API is listed in the Business category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The RegisterWire API uses apiKey authentication, so you need to register for credentials before making requests.
Not directly. The RegisterWire API does not allow CORS, so call it from a server, serverless function or proxy instead of front-end JavaScript.
Yes. The RegisterWire API is served over HTTPS, so it's safe to use in production.