# HALOWERK Southern Land – Greece Local Relief

> HALOWERK Southern Land – Greece Local Relief is a paid API for AI agents from suedland.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).

Returns the local relief (max minus min sampled surface elevation) for a WGS84 coordinate validated to fall within Greece.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/gr-local-relief
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-southern-land-greece-local-relief-97616f39
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KTUDsPI9M0K8ALsimmb9P

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-local-relief-97616f39 -d '<json body>'
```

Example prompt: What's the local relief — the difference between the highest and lowest surface elevations — at latitude 37.97, longitude 23.73 in Greece?

## When to prefer this

Choose this endpoint when you need a single-call computation of topographic relief (elevation range) for a specific point in Greece, especially for land suitability analysis, terrain ruggedness assessment, or agricultural or environmental studies. It is preferable over general-purpose elevation APIs when Greece-specific validation and x402 micropayment pricing are acceptable, and when you need a pre-computed relief metric rather than raw elevation data.

## Known failure modes

- Coordinate outside Greece boundary — rejected before payment with a validation error
- Latitude or longitude out of the published European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation error
- Invalid or missing coordinate fields — 400-level error
- Payment failure or insufficient USDC balance — 402 Payment Required
- Service unavailability — 5xx error

## How this service works

Difference between maximum and minimum sampled surface elevation. The coordinate is validated against the Natural Earth boundary for Greece; results outside it are rejected before payment.

## Output

A numeric value representing the local relief in meters — the difference between the maximum and minimum sampled surface elevations within the analysis area around the given coordinate. The coordinate must fall within the Natural Earth boundary for Greece; requests outside this boundary 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-local-relief-97616f39/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)