Electronic part data for manufacturing, design, and sourcing.
Octopart API is a free Shopping API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.

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Seller fee schedules for 21 e-commerce marketplaces and payment processors as JSON
Yes. The Octopart API is listed in the Shopping 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 Octopart API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the Octopart API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Octopart API is served over HTTPS, so it's safe to use in production.