# HALOWERK Europe Land – Mean Surface Slope (60m Point)

> HALOWERK Europe Land – Mean Surface Slope (60m Point) is a paid API for AI agents from euroland.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Returns the mean first-order surface gradient (slope) in standardized units for a 60-metre analysis grid centred on a given WGS84 coordinate, covering 30 European countries.

## Facts

- Endpoint: POST https://euroland.halowerk.com/v1/europe-mean-slope-point
- 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-europe-land-mean-surface-slope-60m-point-30995fba
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3xfqS2GVV88UOysPtpGz6

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-europe-land-mean-surface-slope-60m-point-30995fba -d '<json body>'
```

Example prompt: What's the mean terrain slope at latitude 47.3, longitude 8.5 in Switzerland — I need the 60-metre local surface gradient for a site assessment?

## When to prefer this

Use this endpoint when you need point-level terrain slope data for any location within Europe's 30-country coverage, particularly when a standardized 60-metre local analysis window is appropriate (e.g. site assessments, land planning, routing). Prefer this over global DEM APIs when European consistency and per-country standardization matter, and when sub-100m resolution slope analysis is sufficient.

## Known failure modes

- Coordinate outside European coverage bounds (latitude 34–72.5, longitude -31.5–40.5) returns an error or no-data response
- Invalid or non-numeric latitude/longitude values cause a validation error
- Coastal or offshore coordinates may fall outside land coverage and return null or error
- Network timeout or service unavailability returns a 5xx error
- Payment failure via x402 protocol prevents request from being processed

## How this service works

Mean first-order surface gradient across the analysis grid. The service evaluates a 60 metre local analysis grid around one coordinate and returns standardized units across all 30 covered countries.

## Output

A numeric value representing the mean first-order surface slope (gradient) across a 60-metre analysis grid centred on the provided coordinate, expressed in standardized units consistent across all 30 covered European countries.

## 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-europe-land-mean-surface-slope-60m-point-30995fba/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from euroland.halowerk.com](https://www.zero.xyz/host/euroland.halowerk.com/llms.txt)