Cook County / Chicago Property Data

FREE ($0, no payment): a fixed, representative example of every paid response shape (search, parcel, dossier, comps). Call this FIRST to validate the data structure and quality before spending anything.

Resolve a Cook County / Chicago street address (full or partial) to its parcel PIN(s) — ranked candidates with address, city, ZIP, and match score. Call this FIRST when you have an address but not a PIN, then pass a returned pin to get_cook_county_parcel / get_cook_county_property_dossier / find_chi

Cook County, IL parcel record (address, assessor class, township, neighborhood, ward, schools, lat/lon) for a 10- or 14-digit PIN. Costs $0.01 per call (x402, USDC).

Full Cook County / Chicago property dossier (parcel basics, recorded sales & deed history, building permits, property-tax assessment history, location context) for a PIN — the one-call due-diligence record. Permits are LINKED to the PIN here (the raw permit open-data has no PIN; links are derived by

Recent arm's-length comparable sales (comps) in the same Cook County assessor neighborhood and property class as the given PIN, with an implied low/median/high price range — a derived, lightweight automated valuation you won't get from a raw open-data query. Costs $0.10 per call (x402, USDC) — the h