# HALOWERK Nordic Land – Denmark Grassland Share

> HALOWERK Nordic Land – Denmark 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 Denmark.

## Facts

- Endpoint: POST https://nordland.halowerk.com/v1/dk-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-denmark-grassland-share-156e4fef
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mPx8XcLJmY3YwjgAygBja

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-denmark-grassland-share-156e4fef -d '<json body>'
```

Example prompt: What share of the land around latitude 55.67, longitude 9.53 in Denmark is classified as grassland according to ESA WorldCover 2021?

## When to prefer this

Use this endpoint when you need ESA WorldCover 2021 grassland cover fraction specifically for a point within Denmark. It is purpose-built for Danish coordinates with boundary validation before billing, making it safe for automated pipelines. Prefer it over generic land cover APIs when you need a lightweight, per-coordinate lookup with pay-per-call pricing and no subscription overhead.

## Known failure modes

- Coordinate outside Denmark boundary: rejected before payment with a validation error
- Coordinate outside European coverage bounds (lat 34–72.5, lon -31.5–40.5): rejected as invalid
- Malformed or missing latitude/longitude fields: schema validation error
- Coordinate in sea or non-terrestrial area: may return zero or low grassland share
- Payment failure: request not processed if x402 payment is not completed

## How this service works

Share of ESA WorldCover 2021 pixels classified as grassland. The coordinate is validated against the Natural Earth boundary for Denmark; 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 analysis area around the submitted Danish coordinate. Coordinates outside Denmark's Natural Earth boundary are rejected before any payment is charged.

## 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-denmark-grassland-share-156e4fef/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)