# HALOWERK Southern Land – Spain Surface Elevation

> HALOWERK Southern Land – Spain Surface Elevation 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 in meters for a given coordinate in Spain using Copernicus DEM GLO-30, with boundary validation against Natural Earth.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/es-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-spain-surface-elevation-9289b4a3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XHKT-S4k2oPHZaAXzrCUU

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-spain-surface-elevation-9289b4a3 -d '<json body>'
```

Example prompt: What is the surface elevation at latitude 37.89, longitude -4.77 in Spain? I need the Copernicus DEM GLO-30 height for that coordinate.

## When to prefer this

Choose this endpoint when you need precise, high-resolution (GLO-30, ~30m) surface elevation for a specific point in Spain with built-in boundary validation and per-call micropayment pricing. Prefer it over generic elevation APIs when Spain-specific geographic validation is required and you want Copernicus DEM quality without managing your own raster data.

## Known failure modes

- Coordinate outside Spain's Natural Earth boundary → request rejected, no charge
- Latitude or longitude outside the published European coverage range (lat 34–72.5, lon -31.5–40.5) → validation error
- Malformed or missing latitude/longitude fields → 400-class error
- Payment failure via x402 protocol → request not processed

## How this service works

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

## Output

A numeric surface elevation value in meters derived from bilinear interpolation of Copernicus DEM GLO-30 data for the requested coordinate. If the coordinate falls outside Spain's Natural Earth boundary, the request is rejected before any charge is applied.

## 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-spain-surface-elevation-9289b4a3/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)