# HALOWERK Baltic Land – Drainage Tendency (Germany)

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

Returns a relative runoff/drainage tendency score for a coordinate in Germany, derived from terrain slope and surface ruggedness.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/de-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-baltic-land-drainage-tendency-germany-2387ad6a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pydVDRfCoyBeLvVasCOYE

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-baltic-land-drainage-tendency-germany-2387ad6a -d '<json body>'
```

Example prompt: What's the relative drainage tendency for the location at 52.5200° N, 13.4050° E in Germany — is the terrain likely to produce significant surface runoff?

## When to prefer this

Choose this endpoint when you need a lightweight, cost-efficient terrain-derived drainage tendency score specifically for locations within Germany, without requiring full hydrological modelling. It is ideal for pre-screening sites for surface runoff risk, enriching geospatial datasets, or supporting land-use and construction decisions. Prefer it over general GIS APIs when you want a pre-computed slope-and-ruggedness-based index rather than raw elevation data.

## Known failure modes

- Coordinate outside Germany's Natural Earth boundary — request rejected before payment is processed
- Latitude or longitude outside the declared European coverage range (lat 34–72.5, lon -31.5–40.5) — validation error
- Malformed or missing coordinate fields — schema validation failure
- Payment failure via x402 protocol — no result returned

## How this service works

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

## Output

A numeric relative runoff/drainage tendency value derived from the terrain slope and surface ruggedness at the queried coordinate. Higher values indicate greater tendency for surface runoff; the result is only returned for coordinates validated to fall within Germany's boundary.

## 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-baltic-land-drainage-tendency-germany-2387ad6a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from baltikum.halowerk.com](https://www.zero.xyz/host/baltikum.halowerk.com/llms.txt)