# HALOWERK Baltic Land – Estonia Local Relief (Elevation Range)

> HALOWERK Baltic Land – Estonia Local Relief (Elevation Range) 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 of a coordinate in Estonia, computed as the difference between maximum and minimum sampled surface elevations within the analysis grid.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/ee-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-estonia-local-relief-elevation-range-d5229c0e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hR5FVEPK_AZe94CAj401E

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-estonia-local-relief-elevation-range-d5229c0e -d '<json body>'
```

Example prompt: What's the local relief — the difference between the highest and lowest surface elevation — at latitude 58.5 and longitude 25.3 in Estonia?

## When to prefer this

Use this endpoint when you need the local topographic relief (elevation range) specifically for a point inside Estonia. It is ideal for terrain ruggedness assessment, construction planning, agricultural suitability, and ecological analysis in the Estonian context. Prefer it over generic elevation APIs when you need the relief metric (max minus min) rather than absolute elevation, and when your coordinate is confirmed to lie within Estonia.

## Known failure modes

- Coordinate outside Estonia boundary — rejected before payment with an error indicating the point is not within the valid coverage area
- Latitude or longitude outside the European coverage bounds (lat 34–72.5, lon -31.5–40.5) — schema validation failure
- Missing required latitude or longitude parameter — request rejected with validation error
- Service unavailability — HTTP 5xx response

## How this service works

Difference between maximum and minimum sampled surface elevation. The coordinate is validated against the Natural Earth boundary for Estonia; results outside it are rejected before payment.

## Output

A numeric value representing the local relief at the queried coordinate, computed as the difference (in meters) between the maximum and minimum sampled surface elevations within the analysis grid. The coordinate must fall within Estonia's Natural Earth boundary; requests outside it are rejected.

## 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-estonia-local-relief-elevation-range-d5229c0e/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)