
Database of malicious URLs used for malware distribution.
URLhaus API is a free Security API that requires no API key, is served over HTTPS and has unconfirmed CORS support.
URLhaus is a project operated by abuse.ch with the purpose of sharing malicious URLs that are being used for malware distribution
Details from urlhaus.abuse.ch.

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Virushee file/data scanning
Threat intelligence: incident clusters, validated IOCs, CVEs, ransomware leak-site victims
Yes. The URLhaus 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 URLhaus API requires no authentication, so you can start making requests without signing up.
CORS support for the URLhaus API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The URLhaus API is served over HTTPS, so it's safe to use in production.