# HALOWERK Baltic Land – Maximum Surface Slope (Latvia)

> HALOWERK Baltic Land – Maximum Surface Slope (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 maximum adjacent-cell surface gradient (steepest slope) across a local analysis grid for a given WGS84 coordinate within Latvia.

## Facts

- Endpoint: POST https://baltikum.halowerk.com/v1/lv-max-slope
- 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-maximum-surface-slope-latvia-2d10a70b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OOeUHEbP1BCSuroMtbxtt

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-maximum-surface-slope-latvia-2d10a70b -d '<json body>'
```

Example prompt: What's the maximum surface slope at latitude 56.95 and longitude 24.11 in Latvia? I need the steepest adjacent-cell gradient for that location.

## When to prefer this

Use this endpoint when you specifically need the maximum surface gradient (steepest slope) at a precise geographic coordinate within Latvia, particularly for terrain suitability assessments, risk screening, or geospatial data enrichment workflows. Prefer it over general-purpose DEM APIs when you need a pre-validated, Latvia-scoped result with pay-per-call pricing and no subscription overhead.

## Known failure modes

- Coordinate outside Latvia boundary — rejected with a geographic validation error before payment
- Latitude or longitude outside the published European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation error
- Missing or malformed latitude/longitude — request rejected with input validation error
- Network or service unavailability — HTTP 5xx response

## How this service works

Maximum adjacent-cell surface gradient across the analysis grid. The coordinate is validated against the Natural Earth boundary for Latvia; results outside it are rejected before payment.

## Output

A numeric value representing the maximum adjacent-cell surface gradient (steepest slope metric) across the analysis grid centered on the input coordinate. Only coordinates falling within the Natural Earth boundary for Latvia are accepted; out-of-bounds requests are rejected before any charge is incurred.

## 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-maximum-surface-slope-latvia-2d10a70b/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)