Cook County / Chicago Property Data — MCP server

A hosted, pay-per-call Model Context Protocol (MCP) server for Cook County, Illinois — including the City of Chicago — property records: parcels, recorded sales & deed history, building permits, and property-tax assessment history, joined and normalized into one answer. Plus comparable sales (comps) and a lightweight automated valuation.

No signup, no API key — pay per call via the x402 protocol (USDC on Base or Solana).

What this adds over raw open data

This returns finished, joined answers — not raw rows you have to query and stitch. The county open data (Socrata) can't give you:

• Building permits linked to a PIN. The Chicago permits feed has no PIN field — the permit→parcel link is derived here (exact address match + nearest-parcel geo match). You can't reproduce this with a raw SoQL query.
• A street address on a parcel. Parcel Universe has no address; it's joined in from a separate dataset here.
• Comparable-sales valuation. Arm's-length filtering, same-neighborhood/class matching, and an implied low/median/high range — derived analysis, not a row fetch.

So one call returns a normalized property record; against raw open data you'd orchestrate multiple datasets and rebuild joins that don't exist upstream.

Connect

• Remote MCP endpoint: https://api.ingest0r.com/mcp (streamable-http — add it to any MCP client; nothing to install)
• PulseMCP: cook-county-property-data
• Official MCP Registry: com.ingest0r.api/cook-county-property-data
• Website / HTTP API: https://api.ingest0r.com
• Free example response (no payment): https://api.ingest0r.com/v1/sample

Tools

Tool	Price	Description
get_free_sample	FREE	Fixed example of every response shape — evaluate before paying.
search_chicago_property_by_address	FREE	Resolve a street address → parcel PIN(s). The no-PIN entry point.
get_cook_county_parcel	$0.01	Single parcel record by 14-digit PIN.
get_cook_county_property_dossier	$0.03	Full dossier: address, sales & deed history, permits, assessment history.
find_chicago_comparable_sales	$0.10	Comparable sales + implied low/median/high valuation.

The PIN tools return an HTTP 402 with machine-readable x402 payment terms; pay in USDC and retry. Search and the sample are free — and three real parcels are served free on the paid routes (live data you can verify against the county's own portals): 09253050270000 · 09253060510000 · 09253140190000.

Data & coverage

~1.9M parcels, refreshed nightly from Cook County Assessor, Cook County Recorder of Deeds, and City of Chicago open-data portals (Socrata). Property-keyed public records only — no owner/occupant personal data.

Use cases

Real-estate due diligence, automated valuation / comps, title & lien research prep, lead enrichment, and market analysis — for autonomous agents and LLM pipelines.