# HALOWERK Baltic Land – Estonia Drainage Tendency

> HALOWERK Baltic Land – Estonia 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 ruggedness for a given coordinate within Estonia.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/ee-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-estonia-drainage-tendency-e80e1013
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mxE95FBZBaM01WMbYuev-

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-estonia-drainage-tendency-e80e1013 -d '<json body>'
```

Example prompt: What's the relative runoff and drainage tendency at latitude 58.7 and longitude 25.5 in Estonia? I need the slope-based terrain drainage score for that point.

## When to prefer this

Choose this endpoint when you need a terrain-derived surface runoff tendency score specifically for a point location within Estonia. It is ideal for hydrological risk assessment, land-use planning, construction site evaluation, or agricultural drainage analysis where slope and ruggedness are the key inputs. Prefer it over generic elevation APIs when you need a processed drainage tendency metric rather than raw elevation data, and over broader European services when you specifically need Estonia-validated results with boundary enforcement.

## Known failure modes

- Coordinate outside Estonia boundary — rejected with an error before payment is processed
- Coordinate outside the published European coverage range (lat 34–72.5, lon -31.5–40.5) — validation failure
- Malformed or missing latitude/longitude — schema validation error
- Point over water or border ambiguity — may be rejected by boundary check
- Payment failure via x402 protocol — call not executed

## How this service works

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

## Output

A numeric relative runoff tendency value derived from terrain slope and ruggedness at the queried point within Estonia. The result reflects how strongly the terrain geometry favors surface water movement away from the location. Coordinates outside the Estonian 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-estonia-drainage-tendency-e80e1013/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)