# HALOWERK Southern Land Greece Elevation Lookup

> HALOWERK Southern Land Greece Elevation Lookup is a paid API for AI agents from suedland.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Returns bilinear-interpolated surface elevation for a WGS84 coordinate in Greece using Copernicus DEM GLO-30 data, with boundary validation against Natural Earth Greece polygon.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/gr-elevation
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-southern-land-greece-elevation-lookup-a663b62d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_L81gGgXfnMXfbebFj-1R8

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-southern-land-greece-elevation-lookup-a663b62d -d '<json body>'
```

Example prompt: What is the surface elevation in meters at latitude 37.9755 and longitude 23.7348 in Greece? Use the Copernicus DEM GLO-30 data.

## When to prefer this

Choose this endpoint when you need point-level surface elevation data specifically within Greece, validated against the official Natural Earth Greece boundary, and backed by the high-resolution Copernicus DEM GLO-30 dataset. It is ideal for geospatial analysis pipelines, land assessment workflows, or any agent task requiring authoritative terrain height at a precise Greek coordinate. Prefer it over generic elevation APIs when Greece-specific boundary enforcement and GLO-30 data provenance are required.

## Known failure modes

- Coordinate outside Greece boundary — request rejected before payment, no charge
- Latitude or longitude out of published European coverage range (lat 34–72.5, lon -31.5–40.5) — validation error
- Missing or malformed latitude/longitude fields — input schema validation error
- Network timeout or service unavailability — HTTP 5xx error
- Payment failure via x402 protocol — transaction not completed, no result returned

## How this service works

Bilinear surface elevation from Copernicus DEM GLO-30. The coordinate is validated against the Natural Earth boundary for Greece; results outside it are rejected before payment.

## Output

A numeric surface elevation value (in meters above sea level) derived from bilinear interpolation of the Copernicus DEM GLO-30 30-meter resolution grid at the queried coordinate. Coordinates outside the Greece boundary (as defined by Natural Earth) are rejected before any charge is incurred.

## 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-southern-land-greece-elevation-lookup-a663b62d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from suedland.halowerk.com](https://www.zero.xyz/host/suedland.halowerk.com/llms.txt)