# HALOWERK Southern Land — Spain Drainage Tendency

> HALOWERK Southern Land — Spain Drainage Tendency 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 relative runoff/drainage tendency for a coordinate in Spain, derived from terrain slope and surface ruggedness.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/es-drainage-tendency
- 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-drainage-tendency-dd0369d1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XGxKW4xj9KHmebi01Kekp

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-drainage-tendency-dd0369d1 -d '<json body>'
```

Example prompt: What's the drainage tendency at latitude 40.42, longitude -3.70 in Spain — is the terrain prone to runoff or does it drain poorly?

## When to prefer this

Choose this endpoint when you need a fast, low-cost per-point drainage or runoff tendency metric for locations within Spain, derived from terrain morphology (slope + ruggedness). It is ideal for land suitability screening, agricultural planning, environmental studies, or construction risk assessment where hydrological terrain characteristics matter. Prefer it over full hydrological modeling services when a relative index is sufficient and cost per query needs to be minimal.

## Known failure modes

- Coordinate outside Spain boundary (Natural Earth polygon) — request rejected with an error before payment
- Latitude or longitude out of the accepted European coverage range (lat 34–72.5, lon -31.5–40.5) — validation error
- Malformed or missing coordinate fields — input schema validation error
- Network or server timeout — retry recommended

## How this service works

Relative runoff tendency derived from slope and ruggedness. The coordinate is validated against the Natural Earth boundary for Spain; results outside it are rejected before payment.

## Output

A numeric or categorical score representing the relative runoff/drainage tendency at the queried coordinate, derived from local slope steepness and terrain ruggedness. Points outside the Spain boundary are rejected before any charge is made.

## 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-drainage-tendency-dd0369d1/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)