# HALOWERK Nordic Land – Denmark Drainage Tendency

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

Returns relative runoff tendency for a coordinate in Denmark, derived from terrain slope and surface ruggedness.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/dk-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-nordic-land-denmark-drainage-tendency-f0791056
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5Vk6Er0FjeaXwcasP-SAN

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-nordic-land-denmark-drainage-tendency-f0791056 -d '<json body>'
```

Example prompt: What's the drainage tendency at latitude 55.85 and longitude 9.83 in Denmark — I need to know how prone that spot is to surface runoff based on slope and terrain ruggedness.

## When to prefer this

Choose this endpoint when you need a terrain-based, slope-and-ruggedness-derived drainage tendency score for a specific point within Denmark. It is distinct from soil-moisture or satellite-based drainage products; it focuses purely on topographic runoff tendency. Prefer it over generic elevation APIs when you need a hydrologically interpreted score rather than raw elevation data.

## Known failure modes

- Coordinate outside Denmark boundary — request rejected with no charge
- Latitude or longitude out of European coverage bounds (lat 34–72.5, lon -31.5–40.5) — validation error
- Missing required latitude or longitude parameter — schema validation error
- Payment failure via x402 protocol — request not processed

## How this service works

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

## Output

A numeric relative runoff tendency value for the submitted Danish coordinate, computed from terrain slope and surface ruggedness. Coordinates outside Denmark's Natural Earth 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-nordic-land-denmark-drainage-tendency-f0791056/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from nordland.halowerk.com](https://www.zero.xyz/host/nordland.halowerk.com/llms.txt)