Presend API
Security and developer utility API -- malware, vulnerability, and domain checks, no signup.
Free REST API, no key or signup: supply-chain checks (typosquatting, npm maintainer changes, OSV vulnerabilities), security headers, DNS and RDAP lookups, email and IBAN validation.
Strengths
- No API key needed
- Fast: 399 ms response
- Callable from the browser (CORS)
- HTTPS