# HALOWERK Atlantic Land – Netherlands Drainage Tendency

> HALOWERK Atlantic Land – Netherlands Drainage Tendency is a paid API for AI agents from atlantikland.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 the Netherlands, derived from terrain slope and ruggedness.

## Facts

- Endpoint: POST https://atlantikland.halowerk.com/v1/nl-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-atlantic-land-netherlands-drainage-tendency-094bb36a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iX6P_rAmJkGF4nfS3UdNf

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-atlantic-land-netherlands-drainage-tendency-094bb36a -d '<json body>'
```

Example prompt: What's the relative runoff tendency for the location at 52.3702° N, 4.8952° E in the Netherlands — I need the drainage tendency score based on slope and ruggedness for that spot.

## When to prefer this

Use this endpoint when you need a terrain-derived drainage or runoff tendency score specifically for a coordinate within the Netherlands, particularly when combining hydrological analysis with slope and ruggedness data. It is preferable over generic GIS APIs when you need a pre-validated, per-point runoff metric with built-in boundary enforcement for the Netherlands, paid per-call via USDC micropayment.

## Known failure modes

- Coordinate outside the Netherlands Natural Earth boundary — request rejected with a validation error before payment
- Latitude or longitude outside the published European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation error
- Missing required latitude or longitude fields — 400-level error
- Network or upstream terrain data unavailability — 5xx error

## How this service works

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

## Output

A numeric relative runoff tendency value derived from slope and terrain ruggedness for the queried coordinate, reflecting how prone the location is to surface water runoff. Coordinates outside the Netherlands 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-atlantic-land-netherlands-drainage-tendency-094bb36a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from atlantikland.halowerk.com](https://www.zero.xyz/host/atlantikland.halowerk.com/llms.txt)