# HALOWERK Baltic Land – Lithuania Depression Depth

> HALOWERK Baltic Land – Lithuania Depression Depth 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 positive difference between neighborhood mean elevation and center-cell elevation (depression depth) for a coordinate within Lithuania.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/lt-depression-depth
- 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-lithuania-depression-depth-c8c813ed
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vC3iHG9El6D23HhUCCTcE

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-lithuania-depression-depth-c8c813ed -d '<json body>'
```

Example prompt: What is the depression depth — how much lower the center is compared to the surrounding neighborhood elevation — at coordinates 54.6872° N, 25.2797° E in Lithuania?

## When to prefer this

Use this endpoint when you need a localized topographic depression depth metric specifically within Lithuania. It is ideal for hydrological analysis, flood-risk assessment, agricultural drainage planning, or any terrain analysis workflow where understanding how much a point sits below its surroundings matters. Prefer this over generic DEM APIs when you need Lithuania-scoped validation and a pre-computed neighborhood-mean-minus-center metric rather than raw elevation values.

## Known failure modes

- Coordinate outside Lithuania's Natural Earth boundary — request rejected with validation error before payment
- Latitude or longitude out of the published European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation error
- Missing required latitude or longitude parameter — 400 bad request
- Point falls in area with no elevation data coverage — may return null or error
- Network timeout or service unavailability — 5xx error

## How this service works

Positive difference between the neighborhood mean and center elevation. The coordinate is validated against the Natural Earth boundary for Lithuania; results outside it are rejected before payment.

## Output

A numeric value representing the depression depth: the positive difference (in meters) between the mean elevation of the surrounding neighborhood and the center-cell elevation at the queried coordinate. Coordinates outside Lithuania'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-lithuania-depression-depth-c8c813ed/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)