# HALOWERK Eastern Land – Hungary Drainage Tendency

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

Returns relative runoff tendency for a WGS84 coordinate within Hungary, derived from terrain slope and ruggedness metrics.

## Facts

- Endpoint: POST https://ostland.halowerk.com/v1/hu-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-eastern-land-hungary-drainage-tendency-310fb36b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GsH_ZhlHZ2bNlHOhVgrcs

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-eastern-land-hungary-drainage-tendency-310fb36b -d '<json body>'
```

Example prompt: What's the relative runoff tendency for the location at latitude 47.4979 and longitude 19.0402 in Hungary — I need to know how prone that terrain is to surface drainage based on its slope and ruggedness.

## When to prefer this

Choose this endpoint when you need a fast, pre-computed runoff tendency score specifically for a point within Hungary, based on slope and terrain ruggedness. It is ideal for land assessment, agricultural planning, or environmental screening workflows where a lightweight numeric index is sufficient and a full hydrological model is not required. The built-in boundary validation means you won't be charged for out-of-region queries.

## Known failure modes

- Coordinate outside Hungary boundary — request rejected before payment, error returned indicating location is out of coverage
- Latitude or longitude outside the declared European bounding box (lat 34–72.5, lon -31.5–40.5) — validation error
- Missing or malformed coordinate fields — schema validation error
- Elevation or terrain data unavailable for the exact grid cell — may return null or partial result

## How this service works

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

## Output

A numeric relative runoff tendency score derived from terrain slope and ruggedness for the queried coordinate. Coordinates outside Hungary's Natural Earth boundary are rejected before any payment is processed. The value indicates how prone the surface at that location is to generating runoff.

## 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-eastern-land-hungary-drainage-tendency-310fb36b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ostland.halowerk.com](https://www.zero.xyz/host/ostland.halowerk.com/llms.txt)