# HALOWERK Central Land – CZ Drainage Tendency

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

Returns the relative runoff tendency for a geographic coordinate in Czechia, derived from terrain slope and surface ruggedness using Copernicus DEM data.

## Facts

- Endpoint: POST https://mitteleuropa.halowerk.com/v1/cz-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-central-land-cz-drainage-tendency-5361061b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0BGDXK7gVlpip7TmfOtQP

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-central-land-cz-drainage-tendency-5361061b -d '<json body>'
```

Example prompt: What's the relative runoff tendency for the location at latitude 49.8175 and longitude 15.473 in Czechia — based on slope and terrain ruggedness?

## When to prefer this

Choose this endpoint when you need terrain-derived hydrological runoff tendency specifically for points within Czechia, based on Copernicus DEM slope and ruggedness data. It is ideal for site assessments, environmental modeling, agricultural planning, or infrastructure risk screening within Czech territory. The coordinate boundary validation ensures charges only occur for valid in-scope locations.

## Known failure modes

- Coordinate outside Czechia boundary → rejected with validation error before payment
- Latitude or longitude outside European coverage bounds (lat 34–72.5, lon -31.5–40.5) → schema validation failure
- Missing latitude or longitude in request body → 400 Bad Request
- Payment not provided or insufficient → 402 Payment Required
- Server-side DEM data unavailability → 500 or service error

## How this service works

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

## Output

A numeric value representing the relative runoff tendency at the queried coordinate, derived from terrain slope and surface ruggedness within the local analysis grid. Coordinates outside the Czechia Natural Earth 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-central-land-cz-drainage-tendency-5361061b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mitteleuropa.halowerk.com](https://www.zero.xyz/host/mitteleuropa.halowerk.com/llms.txt)