# HALOWERK Europe Land – Grassland Share (1,000 m Buffer)

> HALOWERK Europe Land – Grassland Share (1,000 m 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 grassland within a 1,000-metre circular buffer around a given European coordinate.

## Facts

- Endpoint: POST https://euroland.halowerk.com/v1/europe-grassland-share-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-grassland-share-1-000-m-buffer-6800ea8e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kwXuhncxiXhWb_A1Sng4L

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-grassland-share-1-000-m-buffer-6800ea8e -d '<json body>'
```

Example prompt: What share of the land within 1 kilometre of latitude 48.8566, longitude 2.3522 in Paris is classified as grassland according to the ESA WorldCover 2021 dataset?

## When to prefer this

Use this endpoint when you need a medium-scale (1 km radius) grassland land cover fraction around a single point in Europe, especially when cross-country standardization matters. Prefer this over the 250 m buffer variant when broader neighborhood context is needed, and over the polygon variant when you only have a point coordinate rather than a defined boundary.

## Known failure modes

- Coordinates outside the covered European bounding box (lat 34–72.5, lon -31.5–40.5) will return an error
- Invalid or non-numeric latitude/longitude values cause a validation error
- Payment failure or insufficient USDC balance prevents the call from completing
- Network timeout if the raster computation takes longer than expected

## How this service works

Share of ESA WorldCover 2021 pixels classified as grassland. The service evaluates a circular 1,000 metre neighborhood around one coordinate and returns standardized units across all 30 covered countries.

## Output

A standardized numeric value representing the share (fraction or percentage) of ESA WorldCover 2021 pixels classified as grassland within the 1,000-metre circular buffer around the supplied coordinate, 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-grassland-share-1-000-m-buffer-6800ea8e/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)