# HALOWERK Europe Land – Mean Slope Buffer 250m

> HALOWERK Europe Land – Mean Slope Buffer 250m 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).

Returns the mean first-order surface gradient (slope) computed over a 250-metre circular neighborhood around a given European coordinate.

## Facts

- Endpoint: POST https://euroland.halowerk.com/v1/europe-mean-slope-buffer-250m
- 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-buffer-250m-254f1b2a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Y_Ji28dDu-359Nn6VYoSe

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-buffer-250m-254f1b2a -d '<json body>'
```

Example prompt: What's the mean slope across a 250-metre radius around latitude 48.8566, longitude 2.3522 in Europe? I need the average terrain steepness in standardized units.

## When to prefer this

Use this endpoint when you need a quick, standardized slope metric for a single point location anywhere across Europe (30 countries) and a 250-metre analysis radius is appropriate for your use case. It is ideal for site-level assessments such as solar suitability, agricultural erosion, construction feasibility, or ecological corridor planning where terrain steepness at a neighbourhood scale matters. Prefer the 60-metre buffer sibling endpoint for finer, more local slope estimates.

## Known failure modes

- Coordinates outside European coverage bounds (lat 34–72.5, lon -31.5–40.5) will result in an error or empty response
- Invalid or non-numeric latitude/longitude values will cause a validation error
- Locations over open water with no terrain data may return null or zero
- Service may return an error if the x402 payment is not completed or USDC balance is insufficient

## How this service works

Mean first-order 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 numeric mean slope value representing the average first-order surface gradient across the 250-metre circular buffer around the supplied coordinate, returned 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-slope-buffer-250m-254f1b2a/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)