dead-drop
Ephemeral zero-knowledge encrypted data sharing

Hash decryption MD5, SHA1, SHA3, SHA256, SHA384, SHA512.
Dehash.lt API is a free Security API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
Details from github.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.
Ephemeral zero-knowledge encrypted data sharing
DNS, WHOIS/RDAP, SSL, subdomain enumeration, and email security in one parallel call
The Dehash.lt API is provided by Dehash-lt (github.com).
Yes. The Dehash.lt API is listed in the Security 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.
No. The Dehash.lt API requires no authentication, so you can start making requests without signing up.
CORS support for the Dehash.lt API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Dehash.lt API is served over HTTPS, so it's safe to use in production.