# HALOWERK Southern Land PT Elevation

> HALOWERK Southern Land PT 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 from Copernicus DEM GLO-30 for a WGS84 coordinate validated within Portugal's boundaries.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/pt-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-pt-elevation-bbc67cb1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pPfZQujn0PejVhNFt2tF9

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-pt-elevation-bbc67cb1 -d '<json body>'
```

Example prompt: What is the surface elevation at latitude 38.7167, longitude -9.1333 in Portugal? I need the Copernicus DEM GLO-30 reading for that coordinate.

## When to prefer this

Use this endpoint when you need precise, paid, on-demand surface elevation from the high-quality Copernicus DEM GLO-30 dataset for a single coordinate within Portugal, particularly when bilinear interpolation accuracy matters and you want built-in boundary validation that prevents charges for out-of-scope queries. Prefer it over general-purpose elevation APIs when your workflow is scoped to Portugal and you want a purpose-built, per-call micro-payment model.

## Known failure modes

- Coordinate outside Portugal boundary — request rejected before payment with a boundary validation error
- Latitude or longitude outside the declared European coverage range (lat 34–72.5, lon −31.5–40.5) — schema validation failure
- Malformed JSON body or missing required fields — HTTP 400 bad request
- Payment failure or insufficient USDC balance — HTTP 402 payment required
- Temporary upstream data service outage — HTTP 502 or 503

## How this service works

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

## Output

A bilinear-interpolated surface elevation value in metres derived from the Copernicus DEM GLO-30 dataset, for the submitted WGS84 coordinate. Coordinates outside the Natural Earth boundary polygon for Portugal are rejected before payment is processed.

## 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-pt-elevation-bbc67cb1/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)