# Land Survey Polygon Area & Perimeter Calculator

> Land Survey Polygon Area & Perimeter Calculator is a paid API for AI agents from land-survey.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).

Computes the area (in acres, hectares, and square meters) and perimeter (in feet and meters) of a polygon defined by latitude/longitude vertices.

## Facts

- Endpoint: GET https://land-survey.x402tookit.com/polygon-area?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/land-survey-polygon-area-perimeter-calculator-e4b7b233
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Feu12tuT9GKkf9Hv3t1fe

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 land-survey-polygon-area-perimeter-calculator-e4b7b233
```

Example prompt: What's the area in acres and hectares of a parcel with these corners: 37.7749,-122.4194; 37.7759,-122.4184; 37.7749,-122.4174; 37.7739,-122.4184? Also give me the perimeter in feet.

## When to prefer this

Use this endpoint when you need fast, accurate geodetic area and perimeter calculations for arbitrary polygons defined by lat/lon points — ideal for land parcel screening, drone flight planning, agricultural field sizing, or any geospatial workflow where you have boundary coordinates and need area in multiple units (acres, hectares, sq meters) plus perimeter without setting up local GIS tooling.

## Known failure modes

- Fewer than 3 vertices provided — polygon cannot be computed
- More than 40 vertices provided — exceeds limit
- Malformed coordinate string (wrong separator or missing values)
- Non-numeric or out-of-range lat/lon values
- Payment failure for the $0.02 USDC x402 charge

## How this service works

Area in acres, hectares and square meters and perimeter of a polygon from lat,lon vertices, e.g. a parcel or flight area.

## Output

Returns the polygon's area expressed in acres, hectares, square meters, and square feet, along with the perimeter in both feet and meters, the number of vertices used, and optional summary/disclaimer text. May include a degraded flag if data quality is reduced.

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "points"
     ],
     "properties": {
      "points": {
       "type": "string",
       "description": "Vertices as lat,lon pairs separated by semicolons, 3 to 40 points"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "acres": {
       "type": [
        "null",
        "number"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "hectares": {
       "type": [
        "null",
        "number"
       ]
      },
      "vertices": {
       "type": [
        "null",
        "number"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "notChecked": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "squareFeet": {
       "type": [
        "null",
        "number"
       ]
      },
      "squareMeters": {
       "type": [
        "null",
        "number"
       ]
      },
      "perimeterFeet": {
       "type": [
        "null",
        "number"
       ]
      },
      "perimeterMeters": {
       "type": [
        "null",
        "number"
       ]
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/land-survey-polygon-area-perimeter-calculator-e4b7b233/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from land-survey.x402tookit.com](https://www.zero.xyz/host/land-survey.x402tookit.com/llms.txt)