# HALOWERK Baltic Land – Poland Drainage Tendency

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

Returns a relative runoff tendency score derived from terrain slope and surface ruggedness for a given coordinate within Poland.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/pl-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-baltic-land-poland-drainage-tendency-e63e8f10
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_i-QH_GzO-eGhK38mMxV7f

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-baltic-land-poland-drainage-tendency-e63e8f10 -d '<json body>'
```

Example prompt: What's the relative runoff tendency for the location at latitude 50.06, longitude 19.94 in Poland — based on slope and terrain ruggedness?

## When to prefer this

Choose this endpoint when you need terrain-derived hydrological insight (specifically runoff tendency from slope and ruggedness) for a point location within Poland. It is well-suited for environmental assessments, land suitability analysis, and flood risk screening where a lightweight, per-call geospatial computation is needed rather than a full raster dataset download. Prefer it over general-purpose GIS APIs when you need a pre-computed, boundary-validated scalar index specific to the Polish territory at low per-call cost.

## Known failure modes

- Coordinate outside Poland boundary — request rejected before payment with validation error
- Latitude or longitude outside the published European coverage range (lat 34–72.5, lon -31.5–40.5) — input schema validation failure
- Malformed or missing coordinate fields — 400-level error
- Network or service timeout — no result returned
- Ambiguous or borderline boundary coordinate — may be rejected depending on boundary precision

## How this service works

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

## Output

A numeric relative runoff tendency value derived from terrain slope and surface ruggedness at the requested coordinate. Coordinates outside Poland's 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-baltic-land-poland-drainage-tendency-e63e8f10/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from baltikum.halowerk.com](https://www.zero.xyz/host/baltikum.halowerk.com/llms.txt)