# HALOWERK Central Land – Slovakia Drainage Tendency

> HALOWERK Central Land – Slovakia Drainage Tendency is a paid API for AI agents from mitteleuropa.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Returns a relative runoff tendency score for a coordinate in Slovakia, derived from terrain slope and ruggedness using Copernicus DEM data.

## Facts

- Endpoint: POST https://mitteleuropa.halowerk.com/v1/sk-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-central-land-slovakia-drainage-tendency-5a565bad
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_RhEBZpcllgTcRpnRumoVq

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-central-land-slovakia-drainage-tendency-5a565bad -d '<json body>'
```

Example prompt: What is the drainage tendency at latitude 48.7 and longitude 19.5 in Slovakia — I need the slope and ruggedness based runoff score for that point.

## When to prefer this

Choose this endpoint when you need a terrain-derived, slope-and-ruggedness-based drainage or runoff tendency score specifically for a coordinate within Slovakia. It is pre-validated against Slovak boundaries so out-of-country calls are rejected cheaply. Prefer it over generic elevation or slope APIs when the output needed is specifically a runoff tendency index rather than raw elevation or gradient.

## Known failure modes

- Coordinate outside Slovakia boundary — rejected with a geographic validation error before payment
- Coordinate within European coverage range but outside Slovakia — validation failure
- Latitude or longitude out of published European range (34–72.5N, -31.5–40.5E) — schema validation error
- Missing latitude or longitude parameter — request error
- Ambiguous terrain at coordinate edge of coverage — possible null or low-confidence output

## How this service works

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

## Output

A numeric relative runoff tendency score derived from terrain slope and ruggedness at the requested coordinate. The coordinate is first validated against the Natural Earth boundary for Slovakia; if it falls outside Slovakia, 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-central-land-slovakia-drainage-tendency-5a565bad/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mitteleuropa.halowerk.com](https://www.zero.xyz/host/mitteleuropa.halowerk.com/llms.txt)