# HALOWERK Nordic Land – SE Drainage Tendency

> HALOWERK Nordic Land – SE 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 a relative runoff/drainage tendency score for a coordinate in Sweden, derived from terrain slope and surface ruggedness.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/se-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-se-drainage-tendency-406f4630
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_if6n-PZgJYQ_25hATYbSg

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-se-drainage-tendency-406f4630 -d '<json body>'
```

Example prompt: What's the drainage tendency score for the land at 59.33° N, 18.07° E in Sweden — I need to know how prone that terrain is to surface runoff based on slope and ruggedness.

## When to prefer this

Choose this endpoint when you need a terrain-derived drainage or runoff tendency score specifically for a point within Sweden. It is purpose-built for Swedish geography with boundary validation before billing, making it cost-safe for coordinate checking. Prefer it over generic elevation or slope APIs when the specific output required is a runoff/drainage tendency index informed by both slope and ruggedness together.

## Known failure modes

- Coordinate outside Sweden boundary — rejected before payment with a validation error
- Latitude or longitude outside the declared European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation error
- Malformed or missing coordinate fields — HTTP 400 bad request
- Service unavailable or upstream terrain data error — HTTP 5xx

## How this service works

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

## Output

A numeric relative drainage tendency value derived from terrain slope and ruggedness at the queried coordinate, reflecting the likelihood of surface water runoff at that location within Sweden. Coordinates outside the Sweden 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-nordic-land-se-drainage-tendency-406f4630/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)