Every API, one clean contract.

address OR listing_url → one normalized property snapshot: status, price, sold-history, core facts, valuation (where available), per-field provenance + a match block (how the address was resolved + match_confidence).

{
  "listing_url": "https://www.zillow.com/homedetails/x/117892026_zpid/"
}

address → ranked candidate listings[] (id + source + match_confidence) so the customer picks the exact property (apartment-unit / stale-listing disambiguation). The false-match-reducing flow — call this when a snapshot returns low confidence.

{
  "address": "137 Mellison Road, Tooting, London, SW17"
}

snapshot up to 10 addresses/listing-URLs in one call (standard mode, cache-first, per-item ok/error).

{
  "items": [
    "0 Main St, Austin, TX",
    "1 Main St, Austin, TX",
    "2 Main St, Austin, TX",
    "3 Main St, Austin, TX",
    "4 Main St, Austin, TX",
    "5 Main St, Austin, TX",
    "6 Main St, Austin, TX",
    "7 Main St, Austin, TX",
    "8 Main St, Austin, TX",
    "9 Main St, Austin, TX",
    "10 Main St, Austin, TX"
  ]
}

Static capability map: which countries/sources are supported, per-country source set, and the documented gaps (UK has no AVM; JP only 4 prefectures). No sub-calls.