Companies that just raised funding, scored as sales leads, from public SEC filings.
Funding Signals 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.

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Yes. The Funding Signals 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 Funding Signals API uses apiKey authentication, so you need to register for credentials before making requests.
Not directly. The Funding Signals API does not allow CORS, so call it from a server, serverless function or proxy instead of front-end JavaScript.
Yes. The Funding Signals API is served over HTTPS, so it's safe to use in production.