# HALOWERK Nordic Land – Grassland Share (Iceland)

> HALOWERK Nordic Land – Grassland Share (Iceland) 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 WGS84 coordinate within Iceland's boundary.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/is-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-grassland-share-iceland-48790003
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XiiisycJJvMjUFSQNYIp1

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-grassland-share-iceland-48790003 -d '<json body>'
```

Example prompt: What share of ESA WorldCover 2021 pixels at latitude 64.1355, longitude -21.8954 in Iceland are classified as grassland?

## When to prefer this

Choose this endpoint when you need a precise, pixel-level grassland land cover fraction specifically for locations within Iceland, sourced from ESA WorldCover 2021 data. It is ideal for agriculture, ecology, land management, or carbon accounting workflows that require an authoritative, satellite-derived grassland metric rather than a coarser dominant land class. Use sibling endpoints for soil properties, other land cover classes, or terrain metrics at the same coordinate.

## Known failure modes

- Coordinate outside Iceland boundary — rejected before payment with a validation error
- Coordinate within broader European coverage range but outside Iceland — boundary check fails
- Latitude or longitude out of published European coverage bounds (lat 34–72.5, lon -31.5–40.5) — schema validation error
- Network timeout or service unavailability — standard HTTP 5xx error
- Payment failure via x402 protocol — call not executed

## How this service works

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

## Output

A numeric value representing the share (fraction or percentage) of ESA WorldCover 2021 pixels at the queried coordinate that are classified as grassland, validated against Iceland's Natural Earth boundary. Coordinates outside Iceland are rejected without charge.

## 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-grassland-share-iceland-48790003/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)