Cook County Property MCP

What hyperionxmota/cook-county-property-mcp MCP server does

hyperionxmota/cook-county-property-mcp MCP server exposes public property data for Cook County, Illinois, including Chicago and more than 100 suburbs. Its records cover roughly 1.9 million parcels and are refreshed nightly from Cook County Assessor, Cook County Recorder of Deeds, and City of Chicago Socrata datasets.

The service is designed to return joined, property-focused answers rather than isolated open-data rows. A dossier can combine parcel attributes, recorded sales and deed history, building permits, tax assessment history, and neighborhood context. The data is property-keyed and does not include owner or occupant personal data.

How it works

Start with search_chicago_property_by_address when you have an address but no PIN. It returns ranked parcel candidates with address details, a match score, and a match_quality value. Treat exact as a confident match, likely as a shared-house-number match, and weak as unsuitable for relying on the result.

Pass a selected 10- or 14-digit PIN to the parcel, dossier, or comparable-sales tools. get_cook_county_parcel provides a focused record, while the dossier assembles related sales, permits, assessments, and geographic context. Permit-to-PIN relationships are derived from address and geographic matching because the underlying permit data does not contain PINs.

Setup and configuration

The hyperionxmota/cook-county-property-mcp MCP server is hosted remotely at https://api.ingest0r.com/mcp using streamable HTTP, so there is no local package to install. Add the endpoint to an MCP-compatible client. No signup or API key is required.

Free access includes the sample tool and address search without a wallet. The parcel, dossier, and comparable-sales routes provide the first 100 calls per day at no charge; after that allowance, they return x402 payment terms. Paid calls cost $0.01 for a parcel, $0.03 for a dossier, and $0.10 for comparable sales, payable in USDC on Base or Solana. The daily allowance resets at 00:00 UTC.

Tools and capabilities

• get_free_sample: Returns fixed examples covering address search, parcel data, dossiers, and comparable sales. Use it to inspect response shapes before making other requests.
• search_chicago_property_by_address: Resolves full or partial Cook County addresses to ranked PIN candidates.
• get_cook_county_parcel: Returns parcel location, classification, township, municipal, district, school, walkability, airport-noise, coordinate, and tax-year fields.
• get_cook_county_property_dossier: Returns a consolidated property record with sales, deeds, permits, assessments, and local context.
• find_chicago_comparable_sales: Finds recent arm's-length sales in the same assessor neighborhood and property class, then reports distances and an implied low, median, and high range.

Limitations and notes

Comparable sales are not normalized for building size or age. Thin markets cause the matching criteria to widen, and the response identifies which matching rung was used. Assessment figures are assessed values, not market prices; for most residential classes they are approximately 10% of market value, and the response includes an assessment note.

The address-to-PIN workflow depends on match quality, so weak candidates should not be used for downstream research. The comparable-sales output is a lightweight derived valuation, not a formal appraisal. Calls beyond the free daily allowance require x402-compatible USDC payment.