# HALOWERK Europe Land – Max Slope 250m Buffer

> HALOWERK Europe Land – Max Slope 250m Buffer is a paid API for AI agents from euroland.halowerk.com, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-13).

Returns the maximum adjacent-cell surface gradient within a 250-metre circular neighborhood around a given European coordinate, covering 30 countries.

## Facts

- Endpoint: POST https://euroland.halowerk.com/v1/europe-max-slope-buffer-250m
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-europe-land-max-slope-250m-buffer-e6ee9450
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nEwaWT4b9QakYNYxPDHTk

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-max-slope-250m-buffer-e6ee9450 -d '<json body>'
```

Example prompt: What's the maximum slope within 250 metres of latitude 48.8566, longitude 2.3522 in Europe — I need the steepest terrain gradient value for that area.

## When to prefer this

Choose this endpoint when you need a quick, standardized maximum slope value for a single point within European territory using a 250-metre neighborhood — ideal for site screening, land suitability checks, and terrain risk assessments where local peak steepness matters more than average slope. Prefer this over larger buffer variants (1,000m) when you need fine-grained, localized terrain characterization, and over polygon-based endpoints when you only have a coordinate rather than a defined boundary.

## Known failure modes

- Coordinate outside European coverage bounds (latitude not in 34–72.5, longitude not in -31.5–40.5) returns an error or empty result
- Missing or malformed latitude/longitude input causes a validation error
- Payment failure or insufficient USDC balance blocks the request
- Service unavailability or internal server error returns a 5xx response
- Coordinate in a country not among the 30 covered nations may return no data

## How this service works

Maximum adjacent-cell surface gradient across the analysis grid. The service evaluates a circular 250 metre neighborhood around one coordinate and returns standardized units across all 30 covered countries.

## Output

A single standardized numeric value representing the maximum adjacent-cell surface gradient (slope) detected within the 250-metre circular analysis buffer around the supplied coordinate, expressed in consistent units 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-max-slope-250m-buffer-e6ee9450/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)