# HALOWERK Southern Land – Portugal Soil Organic Carbon (0–5 cm)

> HALOWERK Southern Land – Portugal Soil Organic Carbon (0–5 cm) is a paid API for AI agents from suedland.halowerk.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-15).

Returns the mean SoilGrids organic carbon content for the 0–5 cm soil layer at a given WGS84 coordinate within Portugal, validated against Natural Earth boundaries.

## Facts

- Endpoint: POST https://suedland.halowerk.com/v1/pt-soil-organic-carbon
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-southern-land-portugal-soil-organic-carbon-0-5-cm-2948e9a8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_W3OKXa9-wws3Fh24upouI

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-southern-land-portugal-soil-organic-carbon-0-5-cm-2948e9a8 -d '<json body>'
```

Example prompt: What's the mean organic carbon content in the top 5 cm of soil at latitude 38.72, longitude -9.14 in Portugal? I need the SoilGrids value for that location.

## When to prefer this

Choose this endpoint when you need point-level soil organic carbon data specifically within Portugal, backed by the authoritative SoilGrids dataset. It is ideal for agricultural assessments, environmental baselines, carbon accounting, and land-use analysis where only the 0–5 cm topsoil layer is needed. Prefer it over generic soil APIs when Portugal-boundary validation is required before incurring costs, or when you need SoilGrids-sourced values rather than satellite-derived proxies.

## Known failure modes

- Coordinate outside Portugal's Natural Earth boundary — request is rejected before payment with a boundary validation error
- Latitude or longitude outside the published European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation error
- Missing required latitude or longitude parameters — 400 bad request
- SoilGrids data unavailable for the exact location (e.g. water body, no-data pixel) — null or error response
- Payment failure via x402 protocol — request not fulfilled

## How this service works

Mean SoilGrids organic carbon for the 0-5 cm layer. The coordinate is validated against the Natural Earth boundary for Portugal; results outside it are rejected before payment.

## Output

Returns the mean soil organic carbon value from SoilGrids for the 0–5 cm depth layer at the specified coordinate, expressed as a numeric measurement. The coordinate is pre-validated against the Natural Earth boundary for Portugal; requests outside Portugal are rejected before any 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-southern-land-portugal-soil-organic-carbon-0-5-cm-2948e9a8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from suedland.halowerk.com](https://www.zero.xyz/host/suedland.halowerk.com/llms.txt)