Cook County (Chicago) property records API

Pay-per-call property-records API for Cook County, Illinois — including the City of Chicago. Look up any property by street ADDRESS or 14-digit PIN and get parcel details, recorded sales & deed history, building permits, and property-tax assessment history, joined and normalized into one answer. Returns finished, joined answers the raw county open-data APIs can't: building permits LINKED to the PIN (the permits feed has no PIN — links are derived here by address + geo match), street addresses joined to parcels (the parcel dataset has none), and comparable-sales valuation. You get the answer, not rows to query, stitch, and derive yourself. Use for real-estate due diligence, automated valuation / comparable-sales (comps), title and lien research prep, lead enrichment, and market analysis. ~1.9M parcels, refreshed nightly, property-keyed (public records only — no personal data). No signup or API key: pay per call via the x402 protocol (USDC on Base or Solana).

Skills

• search
  Address → PIN lookup for Cook County / Chicago. Resolve a full or partial STREET ADDRESS to its parcel PIN(s): ranked candidate parcels with address, city, ZIP and a match score — resolving the address↔parcel gap (the raw parcel dataset has no address). The entry point when you have an address but not a PIN — call this before /v1/dossier, /v1/parcel, or /v1/comps. Public assessor records.
  real-estateproperty-datacook-countypublic-records
• parcel
  Single Cook County, IL parcel record by PIN: street address, city, ZIP, assessor property class, township, neighborhood, ward/municipality, census tract, school districts, walkability and airport-noise context, and lat/lon — with the street address joined in (the raw parcel dataset has none). The cheap single-property lookup. Source: Cook County Assessor, refreshed nightly.
  real-estateproperty-datacook-countypublic-records
• dossier
  Complete property record for a Cook County / Chicago parcel in one paid call: address and parcel basics PLUS recorded sales & deed history, building permits, and property-tax assessment history, joined and normalized — with neighborhood/ward/school/walkability context. Includes building permits LINKED to the PIN — a join the raw permit open-data can't return (it has no PIN; links are derived here by address + geo match). One finished record, not several raw queries to stitch. For real-estate due diligence, valuation, underwriting, and lead enrichment. Nightly-fresh; property-keyed (no personal data).
  real-estateproperty-datacook-countypublic-records
• comps
  Comparable sales (comps) and a lightweight automated valuation for a Cook County / Chicago property: recent arm's-length sales in the same assessor neighborhood and property class over the last 18 months, with an implied low/median/high price range. Non-arm's-length and multi-parcel deeds are filtered out — a derived valuation you won't get from a raw open-data query. For valuation, underwriting, investment screening, and due diligence.
  real-estateproperty-datacook-countypublic-records

How to call

https://api.ingest0r.com