Kanban software, Visualize Work, Increase Organizations Lead Time, Throughput & Productivity.
SwiftKanban API is a free Business API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.

Unified API suite · now live
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Yes. The SwiftKanban 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 SwiftKanban API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the SwiftKanban API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The SwiftKanban API is served over HTTPS, so it's safe to use in production.