# HALOWERK Baltic Land – Local Relief (Lithuania)

> HALOWERK Baltic Land – Local Relief (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 local relief value (difference between maximum and minimum sampled surface elevation) for a WGS84 coordinate validated within Lithuania's boundary.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/lt-local-relief
- 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-local-relief-lithuania-94e5f6d9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9K-bA-5hCmDePqB7_IY1T

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-local-relief-lithuania-94e5f6d9 -d '<json body>'
```

Example prompt: What's the local relief — the difference between the highest and lowest surface elevation — for the point at latitude 54.69 and longitude 25.28 in Lithuania?

## When to prefer this

Choose this endpoint when you need local topographic relief (elevation range) specifically for a point within Lithuania, particularly when coordinates must be pre-validated against national boundaries before incurring a charge. Prefer it over generic elevation APIs when working within the Baltic/Lithuanian geospatial context and needing a simple, per-call micro-payment model.

## Known failure modes

- Coordinate outside Lithuania's Natural Earth boundary: request rejected with a validation error, no charge applied
- Coordinate outside the published European coverage bounds (lat 34–72.5, lon -31.5–40.5): rejected
- Missing or malformed latitude/longitude fields: validation error returned
- Service unavailable or upstream DEM data error: 5xx response

## How this service works

Difference between maximum and minimum sampled surface 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 local relief — the difference in meters between the maximum and minimum sampled surface elevation — for the requested Lithuanian 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-local-relief-lithuania-94e5f6d9/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)