# HALOWERK Atlantic Land – France Grassland Share

> HALOWERK Atlantic Land – France Grassland Share is a paid API for AI agents from atlantikland.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 France.

## Facts

- Endpoint: POST https://atlantikland.halowerk.com/v1/fr-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-atlantic-land-france-grassland-share-d5b727aa
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__A-OnS3kniCeI3BOGW7Cm

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-atlantic-land-france-grassland-share-d5b727aa -d '<json body>'
```

Example prompt: What share of the land around latitude 46.2 and longitude 2.5 in France is classified as grassland according to ESA WorldCover 2021 satellite data?

## When to prefer this

Choose this endpoint when you need satellite-derived grassland land cover fractions specifically within France, validated against official boundary data. It is ideal for agricultural analysis, land use profiling, carbon project baselines, or real estate due diligence where ESA WorldCover 2021 grassland classification is the authoritative source. Prefer this over generic GIS services when you need a pre-processed, pay-per-call result with boundary validation built in.

## Known failure modes

- Coordinate outside France boundary (Natural Earth) — request rejected before payment
- Coordinate within European coverage bounds but outside France — rejected
- Latitude or longitude out of the accepted European range (lat 34–72.5, lon -31.5–40.5) — schema validation error
- Missing latitude or longitude parameter — request fails with validation error
- Network timeout or service unavailability

## How this service works

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

## Output

A numeric value (fraction or percentage) representing the share of ESA WorldCover 2021 pixels classified as grassland within the analysis grid around the provided French coordinate. The coordinate is validated against the Natural Earth boundary for France before the result is returned; out-of-boundary requests are rejected.

## 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-atlantic-land-france-grassland-share-d5b727aa/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from atlantikland.halowerk.com](https://www.zero.xyz/host/atlantikland.halowerk.com/llms.txt)