# HALOWERK Europe Land – Local Relief Range (250m Buffer)

> HALOWERK Europe Land – Local Relief Range (250m 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 local relief range (max minus min surface elevation) within a 250-metre circular neighbourhood around a given European coordinate.

## Facts

- Endpoint: POST https://euroland.halowerk.com/v1/europe-local-relief-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-local-relief-range-250m-buffer-47d2a18f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fEx8rTzonOBeBafoThk3S

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-local-relief-range-250m-buffer-47d2a18f -d '<json body>'
```

Example prompt: What's the local relief range — the difference between the highest and lowest elevation — within 250 metres of latitude 48.8566, longitude 2.3522 in Europe?

## When to prefer this

Choose this endpoint when you need a fast, point-specific measure of topographic roughness or local terrain variability at a single European location within a standardised 250-metre radius. It is ideal when you want a simple scalar relief index rather than a full elevation profile or DEM raster. Prefer it over larger-buffer variants when fine-grained local variation (sub-quarter-kilometre scale) is what matters for your use case.

## Known failure modes

- Coordinate outside European coverage bounds (latitude 34–72.5, longitude -31.5–40.5) returns an error
- Invalid or non-numeric latitude/longitude values cause a validation error
- Point falling in a data gap or coastal edge may return null or partial result
- Payment failure via x402 protocol results in 402 response and no data returned

## How this service works

Difference between maximum and minimum sampled surface elevation. The service evaluates a circular 250 metre neighborhood around one coordinate and returns standardized units across all 30 covered countries.

## Output

A single numeric value representing the difference (in standardized units) between the maximum and minimum sampled surface elevation within a 250-metre circular buffer around the provided coordinate, covering any of 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-local-relief-range-250m-buffer-47d2a18f/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)