# 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, $0.1/call, status unknown (last checked 2026-09-15).

Look up Cook County/Chicago parcel details, sales history, deed records, building permits, and tax assessment history by street address or 14-digit PIN

## Facts

- Endpoint: GET https://api.ingest0r.com/v1/comps/%7Bpin%7D
- Price: $0.1/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-2af65113
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__DbkUPn8iNyis4AxxOqgW

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-2af65113
```

Example prompt: Pull the full property record for 1234 N Clark St Chicago IL — I need the parcel details, sales and deed history, any building permits, and tax assessment history all in one shot.

## When to prefer this

Choose this endpoint when you need Cook County / Chicago property data aggregated from multiple county sources (Assessor, Recorder, City permits) in a single call, without managing separate API integrations. Ideal for real-estate due diligence, automated valuation, comparable-sales analysis, title research prep, and lead enrichment workflows where paying per-call is preferable to building and maintaining scraper pipelines against public portals.

## Known failure modes

- PIN or address not found in the ~1.9M parcel database — returns 404 or empty result
- Malformed 14-digit PIN or unparseable address — returns 400 validation error
- Payment not received or insufficient USDC balance via x402 — returns 402 Payment Required
- Data temporarily stale if nightly refresh has not yet completed — may return prior-night snapshot
- Ambiguous address matching multiple parcels — may return multiple candidates or require PIN disambiguation

## 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 JSON object combining parcel metadata, recorded sales and deed history, building permit records, and property tax assessment history for the queried Cook County property, sourced from the county Assessor, Recorder of Deeds, and City of Chicago permit portals.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "pin": "25212190120000",
  "comps": [
   {
    "pin": "25212190140000",
    "deed_type": "WARRANTY DEED",
    "sale_date": "2024-09-12",
    "sale_price": 262000,
    "prop_address": "5 E 113TH ST"
   }
  ],
  "implied_range": {
   "n": 7,
   "low": 238000,
   "high": 271000,
   "median": 255000
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/cook-county-chicago-property-records-api-2af65113/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)