Cook County (Chicago) property records API

Name: Cook County (Chicago) property records API
Author: independent

AgentA2A

by independenthomepage ↗v0.4.2

Observed by Wellknown

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30-day availability1/1 checks ok

30 days agotoday

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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 and no API key. Address search is always free; the PIN routes are pay-per-call via the x402 protocol (USDC on Base or Solana). No API key and NO WALLET NEEDED to start: address search is always free and the first 25 calls per client per day return real data free; x402 (USDC on Base/Solana) covers anything beyond that.

freesampleevaluationreal-estateproperty-datacook-countypublic-records

Declared skills

sample — FREE fixed example of every paid response shape — evaluate the data structure and quality for $0 before paying. Not a live record; see also the free live example PINs in the manifest.
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, a match score and a match_quality flag (exact | likely | weak | none) — resolving the address-to-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. FREE — no payment required (the PIN routes are pay-…
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. FREE for your first 25 calls per client per day (no wallet needed); $0.01 per call past that allowance.
dossier — Complete Cook County / Chicago property record in one call: parcel basics PLUS recorded sales & deed history, building permits, and property-tax assessment history, joined and normalized, with neighborhood/ward/school/walkability context. Permits are LINKED to the PIN (the raw permit feed has none) — one finished record, not raw rows to stitch. For due diligence, valuation, underwriting. Nightly-fresh; no personal data. FREE for your first 25 calls per client per day (no wallet needed); $0.03 p…
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, each comp carrying its distance in metres from the subject. Thin markets widen automatically (36 months, then the property-class group) and the response reports which rung was used. Non-arm's-length and multi-parcel deeds are filtered out — a derive…

kind ← A2A Agent Card

name ← A2A Agent Card

summary ← A2A Agent Card

version ← A2A Agent Card

description ← A2A Agent Card

homepageUrl ← A2A Agent Card

publisherUrl ← A2A Agent Card

publisherName ← A2A Agent Card

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A2A Agent Cardhttps://api.ingest0r.com/.well-known/agent-card.json

first seen 5 h ago · fetched 5 h agoopen ↗

Field history (7 recent events)

5 h ago · declared · summary → "Pay-per-call property-records API for Cook County, Illinois — including the City of Chicago. Look up any property by st
5 h ago · declared · description → "Pay-per-call property-records API for Cook County, Illinois — including the City of Chicago. Look up any property by st
5 h ago · declared · publisherName → "independent"
5 h ago · declared · publisherUrl → "https://api.ingest0r.com"
5 h ago · declared · homepageUrl → "https://api.ingest0r.com/llms.txt"
5 h ago · declared · version → "0.4.2"
5 h ago · declared · protocols → ["a2a"]

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