# Chicago Building Violations Lookup

> Chicago Building Violations Lookup is a paid API for AI agents from x402-mcp.onrender.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Queries the City of Chicago open data portal for active DOB building code violations at a given street address, returning violation codes, status, and inspector comments.

## Facts

- Endpoint: GET https://x402-mcp.onrender.com/us/chi/property-check
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/chicago-building-violations-lookup-cb59d2e1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_St1jvP2u2dtUIWN_-QIGr

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 chicago-building-violations-lookup-cb59d2e1
```

Example prompt: Can you check if 2345 N Milwaukee Ave Chicago has any open building code violations on file with the city?

## When to prefer this

Use this endpoint when you need real-time Chicago Department of Buildings violation data for a specific address — particularly for tenant screening, landlord due diligence, or lender underwriting workflows. Prefer this over manual city portal lookups when automating property checks at scale. Note: this does not return rental license registry data, which Chicago does not publish as a single open feed.

## Known failure modes

- Address not found or not parseable — returns empty results or error
- Address outside Chicago city limits — no data returned
- City of Chicago open data API temporarily unavailable — request timeout or 503
- Ambiguous or misspelled address — may return no results or wrong property
- No violations on record — returns empty violations array (not an error)

## How this service works

Chicago building violations address check: open DOB code cases for a street address. Property due diligence agent for Chicago Illinois housing compliance open data. GET ?address= → recent building violations with codes, status, inspector comments (JSON). Tenant screening, landlord diligence, lending. Note: citywide rental-license registry is not a single open feed.

## Output

A JSON response from Chicago's open data system listing any active Department of Buildings violations at the queried address, including violation codes, current status (open/closed), inspector remarks, and relevant dates.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/chicago-building-violations-lookup-cb59d2e1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-mcp.onrender.com](https://www.zero.xyz/host/x402-mcp.onrender.com/llms.txt)