4 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.
Batch link check (up to 10 URLs per call): The link-check for up to 10 URLs in one paid call (comma-separated): for each, alive or dead with the reason, final URL after redirects, redirect chain, cross-domain / HTTPS-dow...
Broken links on a page (up to 40 links checked): Reads one page (robots.txt obeyed) and checks up to 40 of its unique links (internal first) with HEAD then GET: broken links with status or error, restricted (401/403/429/...
Use when an agent is about to give a user links or citations: send up to 10 URLs, and get back the status, redirect chain, final URL, title and hash of each, so a dead, moved or blocked link is caught first. A URL whose...
Signs a timestamped receipt for a file's sha256, proving it existed unchanged then. US$0.002 per call; POST the hash.