# Halowerk Zoning Intelligence Calculator

> Halowerk Zoning Intelligence Calculator is a paid API for AI agents from prop.halowerk.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-14).

Calculates floor-area ratio and lot coverage, then checks a proposed building design against a caller-supplied zoning rule set for use, height, parking, and geometry compliance.

## Facts

- Endpoint: POST https://prop.halowerk.com/v1/zoning-intel
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-zoning-intelligence-calculator-923f2105
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gdjWyXqHfoHSq0N0JJikD

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 halowerk-zoning-intelligence-calculator-923f2105 -d '<json body>'
```

Example prompt: I'm proposing a 5-storey mixed-use building on parcel APN-00423 with a lot area of 1,200 m², zoned C2-Commercial. The gross floor area is 3,600 m², footprint is 800 m², height is 18 m, and we have 20 parking spaces. The rules I'm working with allow residential and retail uses, a maximum FAR of 3.0, maximum lot coverage of 0.70, maximum height of 25 m, and a minimum of 15 parking spaces — can you run a zoning compliance check and tell me if we're within limits?

## When to prefer this

Choose this endpoint when you need a fast, deterministic zoning arithmetic check against a known rule set you supply yourself — ideal for pre-application screening, developer feasibility studies, or automated plan review pipelines where the zoning parameters are already known. Prefer it over manual calculation when you need FAR, lot coverage, and multi-dimensional compliance checked in a single call. Do not use it to look up current zoning codes, resolve overlay districts, handle variances, or obtain legal entitlements — those require official planning authority review.

## Known failure modes

- Missing required parcel fields (parcel_id, lot_area_m2, zoning_label) returns 400 validation error
- Missing required proposal fields returns 400 validation error
- Missing required supplied_rules fields returns 400 validation error
- lot_area_m2 of zero or negative value rejected by schema minimum
- allowed_uses array with fewer than 1 item rejected
- Values exceeding schema maximums (e.g. height > 10,000 m) rejected
- Payment failure or missing x402 payment header returns 402 Payment Required

## How this service works

Calculates floor-area ratio and lot coverage and compares use, height, parking and geometry with an explicit caller-supplied rule set. It does not retrieve or interpret current law, resolve overlays or variances, establish entitlements or provide legal advice; an official planning authority must verify any real project.

## Output

Returns computed floor-area ratio and lot coverage fraction for the parcel, along with a pass/fail compliance verdict for each checked dimension: proposed use against the allowed uses list, building height against the maximum, parking spaces against the minimum, and footprint geometry against the maximum lot coverage. Does not fetch live zoning codes or resolve overlays; results reflect only the caller-supplied rule set.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "parcel": {
   "type": "object",
   "required": [
    "parcel_id",
    "lot_area_m2",
    "zoning_label"
   ],
   "properties": {
    "parcel_id": {
     "type": "string",
     "maxLength": 128,
     "minLength": 1
    },
    "lot_area_m2": {
     "type": "number",
     "maximum": 1000000000000,
     "minimum": 0.01
    },
    "zoning_label": {
     "type": "string",
     "maxLength": 128,
     "minLength": 1
    }
   },
   "additionalProperties": false
  },
  "proposal": {
   "type": "object",
   "required": [
    "proposed_use",
    "gross_floor_area_m2",
    "building_footprint_m2",
    "height_m",
    "parking_spaces"
   ],
   "properties": {
    "height_m": {
     "type": "number",
     "maximum": 10000,
     "minimum": 0
    },
    "proposed_use": {
     "type": "string",
     "maxLength": 128,
     "minLength": 1
    },
    "parking_spaces": {
     "type": "integer",
     "maximum": 1000000,
     "minimum": 0
    },
    "gross_floor_area_m2": {
     "type": "number",
     "maximum": 1000000000000,
     "minimum": 0
    },
    "building_footprint_m2": {
     "type": "number",
     "maximum": 1000000000000,
     "minimum": 0
    }
   },
   "additionalProperties": false
  },
  "supplied_rules": {
   "type": "object",
   "required": [
    "allowed_uses",
    "maximum_floor_area_ratio",
    "maximum_lot_coverage_fraction",
    "maximum_height_m",
    "minimum_parking_spaces"
   ],
   "properties": {
    "allowed_uses": {
     "type": "array",
     "items": {
      "type": "string",
      "maxLength": 128,
      "minLength": 1
     },
     "maxItems": 1000,
     "minItems": 1,
     "uniqueItems": true
    },
    "maximum_height_m": {
     "type": "number",
     "maximum": 10000,
     "minimum": 0
    },
    "minimum_parking_spaces": {
     "type": "integer",
     "maximum": 1000000,
     "minimum": 0
    },
    "maximum_floor_area_ratio": {
     "type": "number",
     "maximum": 1000,
     "minimum": 0
    },
    "maximum_lot_coverage_fraction": {
     "type": "number",
     "maximum": 1,
     "minimum": 0
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-zoning-intelligence-calculator-923f2105/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from prop.halowerk.com](https://www.zero.xyz/host/prop.halowerk.com/llms.txt)