# HALOWERK Europe Land – Terrain Ruggedness Index (250 m Buffer)

> HALOWERK Europe Land – Terrain Ruggedness Index (250 m Buffer) is a paid API for AI agents from euroland.halowerk.com, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-15).

Returns the standard deviation of surface elevations within a 250-metre circular buffer around a given coordinate, serving as a terrain ruggedness index for any location in 30 European countries.

## Facts

- Endpoint: POST https://euroland.halowerk.com/v1/europe-ruggedness-buffer-250m
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-europe-land-terrain-ruggedness-index-250-m-buffer-942877d2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uIEfw-w7R6dqyuMU1zHQ9

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-europe-land-terrain-ruggedness-index-250-m-buffer-942877d2 -d '<json body>'
```

Example prompt: What's the terrain ruggedness — specifically the standard deviation of surface elevations — within 250 metres of latitude 47.37, longitude 8.54 in Switzerland?

## When to prefer this

Choose this endpoint when you need a fast, point-based terrain ruggedness metric for any location across Europe and the 250-metre neighborhood scale is appropriate — ideal for local site assessments, infrastructure siting, and ecological characterization where hyper-local topographic variability matters more than broad landscape-level slope.

## Known failure modes

- Coordinates outside European coverage bounds (latitude 34–72.5, longitude −31.5–40.5) will return an error or out-of-bounds response
- Malformed or missing latitude/longitude values cause a validation error
- Payment failure (x402 protocol) results in a 402 response with no data returned
- Coordinates over open ocean or non-covered territories may return null or zero values

## How this service works

Standard deviation of sampled surface elevations. The service evaluates a circular 250 metre neighborhood around one coordinate and returns standardized units across all 30 covered countries.

## Output

A numeric value representing the standard deviation of sampled surface elevations within a 250-metre circular neighborhood around the supplied coordinate, expressed in standardized units and covering 30 European countries.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "latitude": {
   "type": "number",
   "maximum": 72.5,
   "minimum": 34,
   "description": "WGS84 latitude inside the published European coverage."
  },
  "longitude": {
   "type": "number",
   "maximum": 40.5,
   "minimum": -31.5,
   "description": "WGS84 longitude inside the published European coverage."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-europe-land-terrain-ruggedness-index-250-m-buffer-942877d2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from euroland.halowerk.com](https://www.zero.xyz/host/euroland.halowerk.com/llms.txt)