XLSX Inspector
Inspect XLSX/XLSM structure: sheets, formulas, macros and external links

Web Scraping API that bypasses anti-bot solutions while offering JS rendering, and rotating proxies.
ZenRows API is a free Development API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Fetch, extract, crawl, batch, and operate any website through one API. Including the dynamic and protected pages other tools can't reach.
Details from zenrows.com.

Unified API suite · now live
Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Inspect XLSX/XLSM structure: sheets, formulas, macros and external links
Extract SEO metadata, contact emails, social links, and tech stack (<200ms)
The ZenRows API is provided by Zenrows (zenrows.com). Fetch, extract, crawl, batch, and operate any website through one API. Including the dynamic and protected pages other tools can't reach.
Yes. The ZenRows API is listed in the Development 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 ZenRows API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the ZenRows API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The ZenRows API is served over HTTPS, so it's safe to use in production.