# HALOWERK Nordic Land – Iceland Drainage Tendency

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

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/is-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-iceland-drainage-tendency-85176ec7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0V16AdOZ5gSAoNX73s-Vk

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-iceland-drainage-tendency-85176ec7 -d '<json body>'
```

Example prompt: What's the drainage tendency at latitude 64.13, longitude -21.82 in Iceland — how does the terrain slope and ruggedness affect runoff there?

## When to prefer this

Use this endpoint when you need a terrain-derived hydrology signal (slope + ruggedness → runoff tendency) specifically for locations within Iceland. It is ideal for environmental assessment, land-use planning, agricultural screening, or construction risk analysis where drainage behaviour must be estimated without running a full hydrological model. Prefer this over raw elevation APIs when you need a pre-computed, actionable drainage index rather than raw DEM values.

## Known failure modes

- Coordinate outside Iceland's Natural Earth boundary — request rejected with a boundary validation error and no charge
- Latitude or longitude outside the published European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation failure
- Malformed or missing coordinate fields — HTTP 400 bad request
- Service unavailability or timeout — HTTP 5xx error

## How this service works

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

## Output

A numeric or categorical drainage tendency value derived from slope and surface ruggedness for the queried coordinate. Coordinates outside Iceland's Natural Earth boundary are rejected before any charge is applied. The response reflects relative runoff likelihood, where higher values indicate steeper or more rugged terrain that drains water more rapidly.

## 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-iceland-drainage-tendency-85176ec7/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)