# Cook County (Chicago) Property Records API

> Cook County (Chicago) Property Records API is a paid API for AI agents from api.ingest0r.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-15).

Look up unified parcel details, sales history, deed records, building permits, and tax assessment history for any Cook County, IL property by address or 14-digit PIN.

## Facts

- Endpoint: GET https://api.ingest0r.com/v1/dossier/%7Bpin%7D
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/cook-county-chicago-property-records-api-add4a660
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mqmpZoyF86v74zME0d3_N

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability cook-county-chicago-property-records-api-add4a660
```

Example prompt: Pull the full property dossier for 123 N Michigan Ave, Chicago — I need the parcel details, any recorded sales and deed history, building permits, and tax assessment history all in one place.

## When to prefer this

Use this endpoint when you need a single, unified property record for a Cook County or City of Chicago parcel without manually stitching together the Assessor, Recorder of Deeds, and City permit portals. Ideal for real-estate due diligence, automated valuation/comps, title and lien research prep, lead enrichment, and market analysis at $0.03 per call with no API key required.

## Known failure modes

- Invalid or non-existent PIN returns 404 or empty result
- Address not found or ambiguous address returns no match
- Property outside Cook County returns error or no data
- Payment failure via x402 protocol blocks request
- Nightly refresh lag may mean very recent recordings are not yet reflected

## How this service works

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).

## Output

A normalized, joined dossier containing parcel metadata, recorded sales and deed transaction history, building permit records, and property tax assessment history for the requested Cook County property — sourced from county Assessor, Recorder of Deeds, and City permit data, refreshed nightly.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "lat": 41.6883,
  "lon": -87.6219,
  "pin": "25212190120000",
  "ward": "9",
  "class": "203",
  "permits": [
   {
    "cost": 18500,
    "desc": "Interior renovation — kitchen and bath",
    "type": "RENOVATION/ALTERATION",
    "issued": "2022-08-02"
   },
   {
    "cost": 4200,
    "desc": "Replace rear porch",
    "type": "EASY PERMIT PROCESS",
    "issued": "2019-05-11"
   }
  ],
  "prop_zip": "60628",
  "tax_year": 2025,
  "nbhd_code": "70091",
  "prop_city": "CHICAGO",
  "municipality": "CHICAGO",
  "prop_address": "1 E 113TH ST",
  "sales_history": [
   {
    "date": "2021-06-15",
    "price": 245000,
    "doc_no": "2116622045",
    "deed_type": "WARRANTY DEED"
   },
   {
    "date": "2014-03-20",
    "price": 98000,
    "doc_no": "1407944120",
    "deed_type": "WARRANTY DEED"
   }
  ],
  "township_name": "Hyde Park",
  "assessment_history": [
   {
    "year": 2025,
    "board": 29800,
    "certified": 31250
   },
   {
    "year": 2024,
    "board": 29500,
    "certified": 29500
   },
   {
    "year": 2023,
    "board": 26300,
    "certified": 27100
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/cook-county-chicago-property-records-api-add4a660/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.ingest0r.com](https://www.zero.xyz/host/api.ingest0r.com/llms.txt)