# Land Survey Screening – Elevation Profile

> Land Survey Screening – Elevation Profile is a paid API for AI agents from land-survey.x402tookit.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-30).

Returns an elevation profile (relief, total ascent/descent, steepest grade, and flat/steep verdict) along a straight line between two US coordinate points.

## Facts

- Endpoint: GET https://land-survey.x402tookit.com/elevation-profile?utm_source=zero.xyz
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/land-survey-screening-elevation-profile-267b76e3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qvs4F2xfP9cQXO-Nk3Sw0

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-screening-elevation-profile-267b76e3
```

Example prompt: Can you pull the elevation profile between lat 39.7392, lon -104.9903 and lat 39.6872, lon -104.9020, using 10 sample points, and tell me the total relief, steepest grade, and whether the terrain is flat or steep?

## When to prefer this

Use this endpoint when you need a terrain cross-section or grade analysis between two specific US points — particularly for land survey screening, road or path feasibility, parcel steepness assessment, or any workflow where you need cumulative ascent/descent and a steepest-grade verdict along a transect rather than just a single-point elevation lookup.

## Known failure modes

- Coordinates outside US coverage area return degraded or null elevation data
- Invalid or out-of-range lat/lon values cause a 400-level error
- Fewer than 3 or more than 12 sample points rejected with validation error
- USGS 3DEP data gaps result in a degraded flag with partial profile
- Network timeout from upstream elevation service returns error or null fields

## How this service works

Elevation profile along a line between two US points: relief, ascent, descent, steepest grade and a flat/steep verdict.

## Output

Returns an array of sampled lat/lon/elevation points along the line, total relief in feet, cumulative ascent and descent, the steepest segment with grade percentage, a summary string, a flat/steep verdict, line length in meters, data source attribution, and optional degraded-data flags or disclaimers.

## 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": [
      "lat1",
      "lon1",
      "lat2",
      "lon2"
     ],
     "properties": {
      "lat1": {
       "type": "number",
       "description": "Start latitude"
      },
      "lat2": {
       "type": "number",
       "description": "End latitude"
      },
      "lon1": {
       "type": "number",
       "description": "Start longitude"
      },
      "lon2": {
       "type": "number",
       "description": "End longitude"
      },
      "points": {
       "type": "integer",
       "description": "Samples along the line, 3 to 12, default 8"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "profile": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "object",
        "properties": {
         "lat": {
          "type": [
           "null",
           "number"
          ]
         },
         "lon": {
          "type": [
           "null",
           "number"
          ]
         },
         "elevationFeet": {
          "type": [
           "null",
           "number"
          ]
         }
        }
       }
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "samples": {
       "type": [
        "null",
        "number"
       ]
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "sourceUrl": {
       "type": [
        "null",
        "string"
       ]
      },
      "disclaimer": {
  
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/land-survey-screening-elevation-profile-267b76e3/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)