Every API, one clean contract.

Fetch a URL and return a noise-resistant fingerprint: content_hash (normalised main content, rotating-token-stripped), structural_hash (DOM skeleton), text_hash, title, meta_description, main_content (boilerplate-stripped), word_count, links[]. Store the returned snapshot/hash and feed it back to diff/monitor_check later.

{
  "url": "https://example.com"
}

Diff a page against a prior baseline (snapshot object OR content_hash OR raw text), or compare two live URLs (url + url2). Returns changed(bool), change_ratio(0..1), change_type(text|structural|both|none), added[]/removed[]/modified[] blocks, and a human summary — all on the NOISE-RESISTANT normalised content.

{
  "url": "https://example.com",
  "url2": "https://www.iana.org/help/example-domains"
}

The stateless half of monitoring: re-fetch the URL and tell you FAST whether it changed since a known hash. Pass baseline_hash (+ optional selector/mode). Returns changed(bool) + current_hash + a short diff_summary — the cheap 'did it change?' path.

{
  "url": "https://example.com",
  "baseline_hash": "0000000000000000000000000000000000000000000000000000000000000000"
}

Main-content extraction only — boilerplate (nav/header/footer/ads/cookie/comments) stripped → clean text + structured blocks + links. Useful to feed clean diffs or to get just the article. No fingerprint comparison.

{
  "url": "https://example.com"
}

Snapshot up to 20 URLs concurrently in one call (each independently SSRF-guarded, shared concurrency). Returns a compact fingerprint per URL.

{
  "urls": [
    "https://example.com",
    "https://www.iana.org/domains/reserved"
  ]
}