# HALOWERK Nordic Land – Maximum Surface Slope Gradient (Norway)

> HALOWERK Nordic Land – Maximum Surface Slope Gradient (Norway) is a paid API for AI agents from nordland.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Returns the maximum adjacent-cell surface gradient across a local analysis grid for a given WGS84 coordinate within Norway.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/no-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-nordic-land-maximum-surface-slope-gradient-norway-717752fc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_atHeVNzwSmyC6bQuEjA6b

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-nordic-land-maximum-surface-slope-gradient-norway-717752fc -d '<json body>'
```

Example prompt: What is the maximum adjacent-cell surface slope gradient at latitude 59.91 and longitude 10.75 in Norway?

## When to prefer this

Choose this endpoint when you need the maximum (peak) steepness metric for a Norwegian location specifically, as opposed to mean elevation, slope direction, or soil properties. It is purpose-built for Norway boundary validation and computes the worst-case adjacent-cell gradient, making it ideal for construction feasibility, hazard screening, and terrain classification tasks where the steepest slope matters most.

## Known failure modes

- Coordinate outside Norway Natural Earth boundary — request rejected before payment, returns boundary validation error
- Latitude or longitude outside the published European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation failure
- Network timeout or service unavailability — no result returned
- Malformed input (non-numeric coordinates) — input validation error

## How this service works

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

## Output

A numeric value representing the maximum adjacent-cell surface gradient (steepest slope) computed across the analysis grid centered on the given coordinate. Coordinates outside the Norway 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-nordic-land-maximum-surface-slope-gradient-norway-717752fc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from nordland.halowerk.com](https://www.zero.xyz/host/nordland.halowerk.com/llms.txt)