{"entry":{"slug":"crates-io-api","name":"crates.io API","category":"api","summary":"Rust crate metadata, versions, owners and download counts.","description":"Requires a descriptive User-Agent header; requests without one are rejected.","auth_mode":"none (User-Agent required)","endpoint":"https://crates.io/api/v1","docs_url":"https://crates.io/data-access","tags":["devtools","packages","rust"],"capabilities":["crate_metadata","version_lookup","search"],"auth_params":[],"input_format":"query params","output_format":"json","rate_limit":"1 req/s","pricing":"free","invocation_example":"curl -s -A \"my-agent (contact@example.com)\" https://crates.io/api/v1/crates/serde | head -c 300","verified":false,"verified_at":null,"featured":false,"checks_total":59,"checks_ok":59,"avg_latency_ms":251,"reports_count":0,"health_ok":true,"health_status_code":404,"health_checked_at":"2026-11-01T23:17:18.27+00:00","health_latency_ms":326,"probe_url":null},"watch":{"hint":"Follow \"crates-io-api\": get alerted when it goes down, comes back, or changes shape. Free, 3 tools per key. Email follows are confirmed by a one-click email before alerts start.","how":"POST https://agentnexus.app/api/public/watch with {\"slug\":\"crates-io-api\"} and your x-api-key (the key's email gets the alerts), or add \"email\" / \"webhook_url\". Email follows must be confirmed from the inbox before alerts start."}}