# HALOWERK Baltic Land – Terrain Aspect (Estonia)

> HALOWERK Baltic Land – Terrain Aspect (Estonia) 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 the circular direction of the dominant surface gradient (aspect), clockwise from north, for a given coordinate within Estonia's boundary.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/ee-aspect
- 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-terrain-aspect-estonia-3718fc0f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_C3OZRFfzIzX7Y_eVm12ad

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-terrain-aspect-estonia-3718fc0f -d '<json body>'
```

Example prompt: What direction does the terrain slope face at latitude 58.95 and longitude 25.12 in Estonia? I need the aspect angle clockwise from north.

## When to prefer this

Choose this endpoint when you need terrain aspect (slope-facing direction) specifically for locations within Estonia, and want coordinate pre-validation against the official Estonian boundary so you are not charged for out-of-bounds queries. It is part of a broader HALOWERK Baltic Land suite of terrain and soil variables, making it ideal for pipelines that also consume slope, ruggedness, or soil layer data from the same provider.

## Known failure modes

- Coordinate outside Estonia's Natural Earth boundary — request rejected before payment, no charge incurred
- Latitude or longitude outside the published European coverage range (lat 34–72.5, lon -31.5–40.5) — validation error
- Malformed or missing coordinate fields — schema validation error
- Grid cell with no elevation data — may return null or an error response

## How this service works

Circular direction of the dominant surface gradient, clockwise from north. The coordinate is validated against the Natural Earth boundary for Estonia; results outside it are rejected before payment.

## Output

A numeric value representing the circular direction (in degrees, clockwise from north) of the dominant surface gradient at the queried coordinate. 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-terrain-aspect-estonia-3718fc0f/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)