# HALOWERK Europe Land – Built-Up Share (250m Buffer)

> HALOWERK Europe Land – Built-Up Share (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 2026-09-15).

Returns the share of ESA WorldCover 2021 pixels classified as built-up within a 250-metre circular buffer around a given European coordinate.

## Facts

- Endpoint: POST https://euroland.halowerk.com/v1/europe-built-up-share-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-built-up-share-250m-buffer-a63ee87c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7caEAxkmpAhuCci03gKNi

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-built-up-share-250m-buffer-a63ee87c -d '<json body>'
```

Example prompt: What share of the land within 250 metres of latitude 48.8566, longitude 2.3522 in Paris is classified as built-up according to ESA WorldCover?

## When to prefer this

Choose this endpoint when you need a precise, small-scale (250m radius) measure of built-up land cover at a single European point, sourced from the authoritative ESA WorldCover 2021 dataset. Prefer it over coarser-resolution datasets when local urbanization context matters — e.g. site selection, planning assessments, or property analytics — and when only a single coordinate lookup is needed rather than a polygon area analysis.

## Known failure modes

- Coordinates outside the European bounding box (lat 34–72.5, lon -31.5–40.5) will be rejected
- Missing or malformed latitude/longitude fields return a validation error
- Coordinates over open water or outside WorldCover data extent may return null or zero share
- Payment failure via x402 protocol will prevent the request from completing

## How this service works

Share of ESA WorldCover 2021 pixels classified as built-up. The service evaluates a circular 250 metre neighborhood around one coordinate and returns standardized units across all 30 covered countries.

## Output

A standardized numeric value (fraction or percentage) representing the share of ESA WorldCover 2021 pixels classified as built-up within a 250-metre circular buffer around the supplied coordinate. Coverage applies to 30 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-built-up-share-250m-buffer-a63ee87c/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)