# HALOWERK Europe Land – Surface Elevation 250m Buffer

> HALOWERK Europe Land – Surface Elevation 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 bilinear surface elevation (from Copernicus DEM GLO-30) averaged over a 250-metre circular neighborhood around a given WGS84 coordinate in Europe.

## Facts

- Endpoint: POST https://euroland.halowerk.com/v1/europe-elevation-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-surface-elevation-250m-buffer-ef851ae0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vxOHhDbYgVZmhzEguXRv_

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-surface-elevation-250m-buffer-ef851ae0 -d '<json body>'
```

Example prompt: What is the surface elevation at latitude 47.3 and longitude 11.1 in Austria — use the 250-metre neighborhood DEM average from the Copernicus dataset?

## When to prefer this

Choose this endpoint when you need a smoothed, neighbourhood-averaged surface elevation for a specific European coordinate, particularly when point-level noise is undesirable and a 250-metre circular buffer average is appropriate. It is ideal for site assessment, environmental modelling, and GIS enrichment workflows covering any of the 30 Copernicus-covered European countries. Prefer this over the 60m buffer variant when broader terrain context is needed rather than hyper-local terrain.

## Known failure modes

- Coordinates outside European coverage (latitude 34–72.5, longitude -31.5–40.5) return an error or out-of-bounds response
- Malformed or missing latitude/longitude values cause a validation error
- Network timeouts or upstream DEM service unavailability may return a 5xx error
- Coordinates over open ocean or beyond land coverage may return null or no-data elevation values

## How this service works

Bilinear surface elevation from Copernicus DEM GLO-30. The service evaluates a circular 250 metre neighborhood around one coordinate and returns standardized units across all 30 covered countries.

## Output

A standardized surface elevation value in metres, derived via bilinear interpolation from the Copernicus DEM GLO-30 dataset, representing the mean terrain height within a 250-metre circular buffer around the submitted coordinate.

## 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-surface-elevation-250m-buffer-ef851ae0/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)