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 \u2014 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 \u2014 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 \u2014 no personal data). No signup or API key: pay per call via the x402 protocol (USDC on Base or Solana).",
  "url": "https://api.ingest0r.com",
  "version": "0.1.0",
  "provider": {
    "organization": "independent",
    "url": "https://api.ingest0r.com"
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          ],
          "prices": {
            "/v1/search": "10000",
            "/v1/parcel": "10000",
            "/v1/dossier": "30000",
            "/v1/comps": "100000"
          },
          "currency": "USDC"
        }
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    ]
  },
  "securitySchemes": {},
  "x-free-sample": "https://api.ingest0r.com/v1/sample",
  "skills": [
    {
      "id": "v1_search",
      "name": "search",
      "description": "Address \u2192 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 and a match score \u2014 resolving the address\u2194parcel gap (the raw parcel dataset has no address). The entry point when you have an address but not a PIN \u2014 call this before /v1/dossier, /v1/parcel, or /v1/comps. Public assessor records.",
      "tags": [
        "real-estate",
        "property-data",
        "cook-county",
        "public-records"
      ],
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        "required": [
          "q"
        ],
        "properties": {
          "q": {
            "type": "string",
            "description": "Street address or partial (\u22654 chars), e.g. '1 E 113th St'"
          }
        }
      },
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        "type": "object",
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            "items": {
              "type": "object",
              "properties": {
                "pin": {
                  "type": "string"
                },
                "prop_address": {
                  "type": "string"
                },
                "prop_city": {
                  "type": "string"
                },
                "prop_zip": {
                  "type": "string"
                },
                "score": {
                  "type": "number",
                  "description": "0\u20131 address similarity"
                }
              }
            }
          }
        }
      }
    },
    {
      "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 \u2014 with the street address joined in (the raw parcel dataset has none). The cheap single-property lookup. Source: Cook County Assessor, refreshed nightly.",
      "tags": [
        "real-estate",
        "property-data",
        "cook-county",
        "public-records"
      ],
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          "pin"
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        "properties": {
          "pin": {
            "type": "string",
            "description": "14-digit Cook County PIN (digits or dashed). Use /v1/search first if you only have a street address."
          }
        }
      },
      "x-output-schema": {
        "type": "object",
        "properties": {
          "pin": {
            "type": "string"
          },
          "prop_address": {
            "type": "string"
          },
          "prop_city": {
            "type": "string"
          },
          "prop_zip": {
            "type": "string"
          },
          "class": {
            "type": "string"
          },
          "township_name": {
            "type": "string"
          },
          "nbhd_code": {
            "type": "string"
          },
          "tax_year": {
            "type": "integer"
          },
          "lat": {
            "type": "number"
          },
          "lon": {
            "type": "number"
          }
        }
      }
    },
    {
      "id": "v1_dossier",
      "name": "dossier",
      "description": "Complete property record for a Cook County / Chicago parcel in one paid call: address and parcel basics PLUS recorded sales & deed history, building permits, and property-tax assessment history, joined and normalized \u2014 with neighborhood/ward/school/walkability context. Includes building permits LINKED to the PIN \u2014 a join the raw permit open-data can't return (it has no PIN; links are derived here by address + geo match). One finished record, not several raw queries to stitch. For real-estate due diligence, valuation, underwriting, and lead enrichment. Nightly-fresh; property-keyed (no personal data).",
      "tags": [
        "real-estate",
        "property-data",
        "cook-county",
        "public-records"
      ],
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      "x-price": "$0.03",
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        "required": [
          "pin"
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        "properties": {
          "pin": {
            "type": "string",
            "description": "14-digit Cook County PIN (digits or dashed). Use /v1/search first if you only have a street address."
          }
        }
      },
      "x-output-schema": {
        "type": "object",
        "properties": {
          "pin": {
            "type": "string"
          },
          "prop_address": {
            "type": "string"
          },
          "class": {
            "type": "string"
          },
          "municipality": {
            "type": "string"
          },
          "ward": {
            "type": "string"
          },
          "sales_history": {
            "type": "array",
            "items": {
              "type": "object",
              "properties": {
                "date": {
                  "type": "string"
                },
                "price": {
                  "type": "number"
                },
                "doc_no": {
                  "type": "string"
                },
                "deed_type": {
                  "type": "string"
                }
              }
            }
          },
          "permits": {
            "type": "array",
            "items": {
              "type": "object",
              "properties": {
                "issued": {
                  "type": "string"
                },
                "type": {
                  "type": "string"
                },
                "cost": {
                  "type": "number"
                },
                "desc": {
                  "type": "string"
                }
              }
            }
          },
          "assessment_history": {
            "type": "array",
            "items": {
              "type": "object",
              "properties": {
                "year": {
                  "type": "integer"
                },
                "certified": {
                  "type": "number"
                },
                "board": {
                  "type": "number"
                }
              }
            }
          }
        }
      }
    },
    {
      "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. Non-arm's-length and multi-parcel deeds are filtered out \u2014 a derived valuation you won't get from a raw open-data query. For valuation, underwriting, investment screening, and due diligence.",
      "tags": [
        "real-estate",
        "property-data",
        "cook-county",
        "public-records"
      ],
      "inputModes": [
        "application/json"
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      "x-price": "$0.10",
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          "pin"
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          "pin": {
            "type": "string",
            "description": "14-digit Cook County PIN (digits or dashed). Use /v1/search first if you only have a street address."
          }
        }
      },
      "x-output-schema": {
        "type": "object",
        "properties": {
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            "type": "string"
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          "comps": {
            "type": "array",
            "items": {
              "type": "object",
              "properties": {
                "pin": {
                  "type": "string"
                },
                "prop_address": {
                  "type": "string"
                },
                "sale_date": {
                  "type": "string"
                },
                "sale_price": {
                  "type": "number"
                },
                "deed_type": {
                  "type": "string"
                }
              }
            }
          },
          "implied_range": {
            "type": "object",
            "properties": {
              "low": {
                "type": "number"
              },
              "median": {
                "type": "number"
              },
              "high": {
                "type": "number"
              },
              "n": {
                "type": "integer"
              }
            }
          }
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}