# HALOWERK Nordic Land – Sweden Grassland Share

> HALOWERK Nordic Land – Sweden Grassland Share is a paid API for AI agents from nordland.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Returns the share of ESA WorldCover 2021 pixels classified as grassland for a given coordinate within Sweden.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/se-grassland-share
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-nordic-land-sweden-grassland-share-27e2bac8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_h5stcAJ9dpTWvxLclufkh

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-nordic-land-sweden-grassland-share-27e2bac8 -d '<json body>'
```

Example prompt: What share of the land is classified as grassland at latitude 57.7 and longitude 11.9 in Sweden, based on ESA WorldCover 2021?

## When to prefer this

Choose this endpoint when you need a precise, satellite-derived grassland land cover fraction specifically for a coordinate within Sweden, sourced from ESA WorldCover 2021. It is ideal for ecological assessments, agricultural site evaluations, carbon accounting baselines, or habitat analysis workflows requiring authoritative, pixel-level land cover data. Prefer it over generic GIS APIs when you need the WorldCover 2021 grassland class specifically and need the built-in Sweden boundary validation to avoid paying for out-of-scope queries.

## Known failure modes

- Coordinate outside Sweden's Natural Earth boundary — request rejected before payment, returns validation error
- Coordinate within European coverage bounds but outside Sweden — boundary check fails
- Latitude or longitude outside the published European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation error
- Malformed or missing coordinate fields — request rejected with input validation error
- Network or service unavailability — connection timeout or 5xx error

## How this service works

Share of ESA WorldCover 2021 pixels classified as grassland. The coordinate is validated against the Natural Earth boundary for Sweden; results outside it are rejected before payment.

## Output

A numeric value representing the share (fraction or percentage) of ESA WorldCover 2021 pixels classified as grassland within the sampled area around the provided coordinate in Sweden. Coordinates outside Sweden's Natural Earth boundary are rejected before payment is processed.

## 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-nordic-land-sweden-grassland-share-27e2bac8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from nordland.halowerk.com](https://www.zero.xyz/host/nordland.halowerk.com/llms.txt)