# HALOWERK Europe Land – Mean Slope 1000m Buffer

> HALOWERK Europe Land – Mean Slope 1000m Buffer is a paid API for AI agents from euroland.halowerk.com, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-15).

Computes the mean first-order surface gradient (slope) within a 1,000-metre circular buffer around a given European coordinate using terrain analysis data.

## Facts

- Endpoint: POST https://euroland.halowerk.com/v1/europe-mean-slope-buffer-1000m
- Price: $0.006/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-slope-1000m-buffer-37342f54
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xhPoCuP_i15S_PYj6K6IT

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-slope-1000m-buffer-37342f54 -d '<json body>'
```

Example prompt: What's the mean terrain slope within 1 kilometre of latitude 48.1351, longitude 11.5820 in Europe?

## When to prefer this

Choose this endpoint when you need a spatially averaged slope metric for a 1km radius around a single European coordinate, particularly for site suitability assessments, infrastructure planning, agricultural analysis, or environmental modelling. Prefer it over smaller-radius sibling endpoints (e.g. 60m or 250m buffers) when regional-scale terrain context matters more than hyper-local gradient variation.

## Known failure modes

- Coordinate outside European coverage bounds (latitude not in 34–72.5, longitude not in -31.5–40.5) returns an error
- Invalid or missing latitude/longitude fields return a validation error
- Payment failure or insufficient USDC balance prevents call completion
- Server-side data gap for remote or coastal edge areas may yield null or degraded result

## How this service works

Mean first-order surface gradient across the analysis grid. The service evaluates a circular 1,000 metre neighborhood around one coordinate and returns standardized units across all 30 covered countries.

## Output

Returns the mean first-order surface gradient (slope) computed over a 1,000-metre circular neighbourhood centred on the supplied coordinate, expressed in standardized units. Coverage spans 30 European countries within WGS84 latitude 34–72.5° and longitude -31.5–40.5°.

## 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-slope-1000m-buffer-37342f54/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)