# HALOWERK Baltic Land – Local Relief (Latvia)

> HALOWERK Baltic Land – Local Relief (Latvia) 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 index (max minus min surface elevation) for a WGS84 coordinate within Latvia's boundaries.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/lv-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-latvia-e92c739f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uFI9Mg3xoJN7arH_DE3RS

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-latvia-e92c739f -d '<json body>'
```

Example prompt: What's the local surface relief — the difference between the highest and lowest elevation — at 56.946° N, 24.105° E in Latvia?

## When to prefer this

Choose this endpoint when you need terrain ruggedness or topographic variability specifically for a point location within Latvia. It is ideal for land analysis, site assessments, and geospatial enrichment workflows targeting Latvian coordinates. Prefer this over generic elevation APIs when you need the relief range (max–min) rather than a single elevation value, and when coordinate validation against Latvia's boundary is a desired safety guarantee.

## Known failure modes

- Coordinate outside Latvia's Natural Earth boundary → request rejected before payment, likely 400 or 422 error
- Coordinate within European bounding box but outside Latvia → validation failure
- Latitude or longitude outside the published European coverage range (34–72.5° N, -31.5–40.5° E) → schema validation error
- Network timeout or upstream elevation data unavailable → 503 or timeout error
- Malformed input (non-numeric or missing coordinates) → 400 bad request

## How this service works

Difference between maximum and minimum sampled surface elevation. The coordinate is validated against the Natural Earth boundary for Latvia; 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 elevations within the analysis grid centered on the given coordinate. Coordinates outside Latvia's Natural Earth boundary are rejected before any computation or payment.

## 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-latvia-e92c739f/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)