# HALOWERK Baltic Land – Surface Aspect (Lithuania)

> HALOWERK Baltic Land – Surface Aspect (Lithuania) 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 dominant surface gradient direction (aspect angle, clockwise from north) for a given coordinate within Lithuania's boundary.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/lt-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-surface-aspect-lithuania-7258be2d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rkZfQ2G0srdvpgngxQb9u

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-surface-aspect-lithuania-7258be2d -d '<json body>'
```

Example prompt: What direction does the terrain slope at 54.6872° N, 25.2797° E in Lithuania — give me the dominant surface aspect angle clockwise from north.

## When to prefer this

Use this endpoint when you need the compass-bearing direction of the dominant terrain slope for a specific point in Lithuania. It is ideal for site suitability analysis (solar, agriculture, construction), hydrological modeling, ecological habitat assessment, or any workflow requiring terrain orientation within Lithuania specifically. Prefer this over generic elevation or slope-magnitude endpoints when directionality (aspect) is the key variable, and prefer it over general European terrain APIs when you need Lithuania-specific boundary validation built into the service.

## Known failure modes

- Coordinate outside Lithuania's Natural Earth boundary — request rejected before payment, returns boundary validation error
- Latitude or longitude outside the broader European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation error
- No terrain data available for the given point — may return null or no-data response
- Malformed request body — missing required latitude or longitude fields
- Payment failure via x402 protocol — request not processed

## How this service works

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

## Output

A numeric value representing the circular direction of the dominant surface gradient at the queried coordinate, expressed in degrees clockwise from north (0–360°). Coordinates outside Lithuania's Natural Earth boundary are rejected before any charge is made.

## 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-surface-aspect-lithuania-7258be2d/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)