# HALOWERK Nordic Land – Finland Maximum Surface Slope

> HALOWERK Nordic Land – Finland Maximum Surface Slope 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 (steepest slope) across the analysis grid for a given coordinate within Finland.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/fi-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-finland-maximum-surface-slope-0efc1fba
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UijWTxlRQaiU551CfNaaX

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-finland-maximum-surface-slope-0efc1fba -d '<json body>'
```

Example prompt: What's the maximum surface slope at latitude 60.17 and longitude 24.94 in Finland? I need the steepest terrain gradient value for that point.

## When to prefer this

Choose this endpoint when you need the maximum terrain slope metric for a specific point inside Finland, particularly for land suitability analysis, infrastructure planning, agricultural assessment, or environmental modeling. It is distinct from mean elevation or elevation standard deviation endpoints — use it when the steepest gradient, not average elevation or variability, is the deciding factor. Useful when boundary validation against Finland's official Natural Earth geometry is required before incurring any cost.

## Known failure modes

- Coordinate outside Finland boundary: request rejected before payment, no result returned
- Latitude or longitude out of European coverage range (lat 34–72.5, lon -31.5–40.5): validation error
- Malformed or missing coordinate parameters: input schema validation failure
- Payment failure or insufficient USDC balance: transaction not completed, no result

## How this service works

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

## Output

A numeric value representing the maximum adjacent-cell surface gradient (steepest slope) across the analysis grid for the queried coordinate in Finland. Coordinates outside the Natural Earth boundary for Finland 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-finland-maximum-surface-slope-0efc1fba/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)