
Pay-per-call scans of smart contracts, addresses and MCP/skill packages; small free daily tier.
Tanod API is a free Security API that requires no API key, is served over HTTPS and does not support CORS, so it should be called from a server.
Pay per call from $0.001 in USDC (x402), free daily calls, no signup or API key. Web pages to Markdown, OCR, PDFs, security checks, chain data and more.
Details from tanod.dev.

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.
SSL certificate validity, domain WHOIS status, and DNS record checks for any domain
Threat intelligence: incident clusters, validated IOCs, CVEs, ransomware leak-site victims
Yes. The Tanod 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 Tanod API requires no authentication, so you can start making requests without signing up.
Not directly. The Tanod API does not allow CORS, so call it from a server, serverless function or proxy instead of front-end JavaScript.
Yes. The Tanod API is served over HTTPS, so it's safe to use in production.