# HALOWERK Baltic Land – Lithuania Surface Elevation (Copernicus DEM GLO-30)

> HALOWERK Baltic Land – Lithuania Surface Elevation (Copernicus DEM GLO-30) 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 bilinear-interpolated surface elevation in meters for a WGS84 coordinate validated to lie within Lithuania, sourced from the Copernicus DEM GLO-30 dataset.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/lt-elevation
- 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-surface-elevation-copernicus-dem-glo-30-f15a12f3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_IegR7v421LDllPWqoixWk

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-surface-elevation-copernicus-dem-glo-30-f15a12f3 -d '<json body>'
```

Example prompt: What's the surface elevation at latitude 54.6872 and longitude 25.2797 in Lithuania — pull it from the Copernicus DEM GLO-30 dataset?

## When to prefer this

Use this endpoint when you specifically need high-resolution (GLO-30, ~30m) Copernicus DEM surface elevation for a point coordinate confirmed to be within Lithuania. The pre-payment boundary validation against the Natural Earth Lithuania polygon means coordinates outside Lithuania are rejected for free, avoiding wasted charges. Prefer this over generic elevation APIs when Lithuanian coverage and Copernicus DEM provenance are required. For other Baltic countries or broader European coverage, sibling endpoints on the same platform may apply.

## Known failure modes

- Coordinate outside Lithuania boundary — rejected with an error before payment is charged
- Latitude or longitude outside the published European coverage bounds (lat 34–72.5, lon -31.5–40.5) — validation error
- Malformed or missing latitude/longitude fields — schema validation error
- Payment failure via x402 protocol — request not processed
- Server-side DEM data access error — service unavailable response

## How this service works

Bilinear surface elevation from Copernicus DEM GLO-30. The coordinate is validated against the Natural Earth boundary for Lithuania; results outside it are rejected before payment.

## Output

A numeric surface elevation value in meters, bilinearly interpolated from the Copernicus DEM GLO-30 raster at the requested coordinate. Coordinates outside the Lithuania boundary polygon (per Natural Earth) 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-surface-elevation-copernicus-dem-glo-30-f15a12f3/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)