LinkPulse

Gives Claude a way to sanity-check URLs before acting on them. It fetches the target once every 10 minutes, returning HTTP status, a content hash, a classification tag, a readability score, and a Wayback Machine fallback if the site is down. The caching is shared across all API keys, so popular links cost you credits but skip the network round-trip. You get four endpoints: /v1/check for the full report, /v1/diff to compare against a known hash, /v1/resolve to trace redirects without fetching the body, and /v1/classify to label content you already have. Runs on a prepaid credit model at $0.001 per call, 100 free credits to start. Useful when your agent needs to verify a link exists, detect content drift, or avoid hallucinating dead URLs.