# HALOWERK Baltic Land – Estonia Surface Elevation

> HALOWERK Baltic Land – Estonia Surface Elevation is a paid API for AI agents from baltikum.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).

Returns bilinear-interpolated surface elevation (metres) for a WGS84 coordinate inside Estonia, sourced from Copernicus DEM GLO-30, with boundary validation against Natural Earth.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/ee-elevation
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-baltic-land-estonia-surface-elevation-762da34f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rvEZ-bw7aqnU8c2KnWE7o

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-surface-elevation-762da34f -d '<json body>'
```

Example prompt: What is the surface elevation at latitude 59.437 and longitude 24.753 in Estonia? I need the Copernicus DEM GLO-30 height in metres for that coordinate.

## When to prefer this

Choose this endpoint when you need point-level surface elevation specifically within Estonia, derived from the high-quality 30 m Copernicus GLO-30 DEM with built-in boundary validation that rejects out-of-country queries before charging. Prefer it over generic elevation APIs when Estonian territory coverage and pay-per-call micropayment pricing via x402 are acceptable, and when bilinear interpolation accuracy matters for terrain analysis, drone routing, or civil engineering workflows.

## Known failure modes

- Coordinate outside Estonia's Natural Earth boundary — request rejected before payment with a validation error
- Latitude or longitude out of the published European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation failure
- Network or upstream DEM service unavailability — service error response
- Malformed or missing latitude/longitude fields — input validation error

## How this service works

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

## Output

A numeric surface elevation value in metres, bilinearly interpolated from the Copernicus DEM GLO-30 30-metre resolution grid for the queried coordinate. Coordinates outside the Estonian 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-estonia-surface-elevation-762da34f/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)