# HALOWERK Southern Land – Spain Surface Aspect

> HALOWERK Southern Land – Spain Surface Aspect 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 the circular direction (0–360°, clockwise from north) of the dominant surface gradient for a given coordinate within Spain.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/es-aspect
- 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-aspect-94377f5f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4gEffQM1BDvtWH1Ht1gPf

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-aspect-94377f5f -d '<json body>'
```

Example prompt: What direction does the terrain surface face at latitude 37.8 and longitude -4.2 in Spain — give me the aspect angle in degrees clockwise from north.

## When to prefer this

Choose this endpoint when you need terrain aspect (slope direction) data specifically for coordinates within Spain, and require pre-query geographic validation to avoid wasted calls. Ideal for land suitability analysis, solar orientation assessments, agricultural planning, hydrological modelling, or any use case where knowing which compass direction a slope faces is critical.

## Known failure modes

- Coordinate outside Spain boundary: request rejected before payment, error response indicating out-of-coverage area
- Latitude or longitude outside the accepted WGS84 range for European coverage: validation error
- Malformed input (missing or non-numeric lat/lon): schema validation error
- Network or service timeout: no result returned, retry recommended
- Edge case flat terrain with no dominant gradient: may return null or undefined aspect

## How this service works

Circular direction of the dominant surface gradient, clockwise from north. The coordinate is validated against the Natural Earth boundary for Spain; results outside it are rejected before payment.

## Output

A numeric value representing the dominant surface aspect angle in degrees (0–360°, clockwise from north) for the queried coordinate within Spain. Coordinates outside the Spain boundary are 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-aspect-94377f5f/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)