Cook County (Chicago) property records API

{
  "protocolVersion": "0.3.0",
  "name": "Cook County (Chicago) property records API",
  "description": "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.",
  "author": "independent",
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  "version": "0.4.2",
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  "capabilities": {
    "streaming": false,
    "pushNotifications": false,
    "stateTransitionHistory": false,
    "extensions": [
      {
        "uri": "https://x402.org/extensions/payments",
        "params": {
          "prices": {
            "/v1/comps": "100000",
            "/v1/parcel": "10000",
            "/v1/search": "0",
            "/v1/dossier": "30000"
          },
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              "scheme": "exact",
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              "currency": "USDC"
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          "currency": "USDC",
          "protocol": "x402",
          "x402Version": 2
        },
        "required": false,
        "description": "Pay-per-call via x402 (HTTP 402 + USDC). Applies ONLY past the free daily allowance of 25 calls per client; address search, the sample and the live example PINs never need payment."
      }
    ]
  },
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    "application/json"
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  "defaultOutputModes": [
    "application/json"
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  "skills": [
    {
      "id": "v1_sample",
      "name": "sample",
      "description": "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.",
      "tags": [
        "free",
        "sample",
        "evaluation",
        "real-estate",
        "property-data",
        "cook-county"
      ],
      "examples": [],
      "inputModes": [
        "application/json"
      ],
      "outputModes": [
        "application/json"
      ]
    },
    {
      "id": "v1_search",
      "name": "search",
      "description": "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-per-call).",
      "tags": [
        "real-estate",
        "property-data",
        "cook-county",
        "public-records"
      ],
      "examples": [],
      "inputModes": [
        "application/json"
      ],
      "outputModes": [
        "application/json"
      ]
    },
    {
      "id": "v1_parcel",
      "name": "parcel",
      "description": "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.",
      "tags": [
        "real-estate",
        "property-data",
        "cook-county",
        "public-records"
      ],
      "examples": [],
      "inputModes": [
        "application/json"
      ],
      "outputModes": [
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      ]
    },
    {
      "id": "v1_dossier",
      "name": "dossier",
      "description": "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 per call past that allowance.",
      "tags": [
        "real-estate",
        "property-data",
        "cook-county",
        "public-records"
      ],
      "examples": [],
      "inputModes": [
        "application/json"
      ],
      "outputModes": [
        "application/json"
      ]
    },
    {
      "id": "v1_comps",
      "name": "comps",
      "description": "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 derived valuation you won't get from a raw open-data query. For valuation, underwriting, investment screening, and due diligence. FREE for your first 25 calls per client per day (no wallet needed); $0.10 per call past that allowance.",
      "tags": [
        "real-estate",
        "property-data",
        "cook-county",
        "public-records"
      ],
      "examples": [],
      "inputModes": [
        "application/json"
      ],
      "outputModes": [
        "application/json"
      ]
    }
  ],
  "conformance": true,
  "conformance_errors": null,
  "homepage": null,
  "repository": null,
  "license": null,
  "pricing": null,
  "contact": null,
  "id": "30c0e732-2609-42e3-b61a-8d361d022fc9"
}