# HALOWERK Southern Land – Italy Drainage Tendency

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

Returns the relative runoff tendency for a coordinate in Italy, derived from terrain slope and ruggedness, validated against Italy's Natural Earth boundary.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/it-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-southern-land-italy-drainage-tendency-74eb4637
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ToNKXqsql-oMQBGvOPAmE

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-southern-land-italy-drainage-tendency-74eb4637 -d '<json body>'
```

Example prompt: What's the relative drainage tendency — the slope and ruggedness-based runoff index — for the coordinates 41.9028° N, 12.4964° E in Italy?

## When to prefer this

Use this endpoint when you need a quick, pay-per-call terrain drainage tendency score specifically for a coordinate in Italy. It is ideal for land assessment workflows (agriculture, construction, environmental screening) where slope- and ruggedness-derived runoff tendency is the metric needed, without requiring a full GIS pipeline. Prefer this over generic DEM APIs when Italy-specific boundary validation and micro-payment access ($0.003/call) suit the use case.

## Known failure modes

- Coordinate outside Italy boundary — rejected before payment, likely returns a 422 or boundary-error response
- Latitude or longitude out of the accepted European range (lat 34–72.5, lon -31.5–40.5) — schema validation error
- Malformed JSON body or missing required fields — 400 Bad Request
- Payment not completed or x402 protocol failure — endpoint not executed
- Service unavailable or upstream terrain data error — 5xx response

## How this service works

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

## Output

A numeric relative runoff tendency value derived from the terrain slope and ruggedness at the given coordinate. The endpoint first validates that the coordinate falls within Italy's Natural Earth boundary; coordinates outside Italy 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-southern-land-italy-drainage-tendency-74eb4637/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from suedland.halowerk.com](https://www.zero.xyz/host/suedland.halowerk.com/llms.txt)