# HALOWERK Atlantic Land – Ireland Mean Surface Slope

> HALOWERK Atlantic Land – Ireland Mean Surface Slope is a paid API for AI agents from atlantikland.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).

Returns the mean first-order surface gradient (slope) for a coordinate point within Ireland, validated against the Natural Earth boundary.

## Facts

- Endpoint: POST https://atlantikland.halowerk.com/v1/ie-mean-slope
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-atlantic-land-ireland-mean-surface-slope-2933e9e4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QTMVxGlfakd4LAWsbkyMD

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-ireland-mean-surface-slope-2933e9e4 -d '<json body>'
```

Example prompt: What's the mean surface slope at latitude 52.3, longitude -8.1 in Ireland? I need the terrain gradient for a land assessment.

## When to prefer this

Choose this endpoint when you need mean terrain slope specifically for a point location within Ireland and want coordinate validation guaranteed before billing. It is ideal for land assessment, site suitability, agriculture, hydrology, and infrastructure planning workflows that require Ireland-specific terrain gradient data.

## Known failure modes

- Coordinate outside Ireland boundary — rejected with validation error, no charge applied
- Latitude or longitude out of the published European coverage range (lat 34–72.5, lon -31.5–40.5) — schema validation failure
- Malformed or missing latitude/longitude fields — request error
- Payment failure via x402 protocol — transaction not completed
- Network timeout or service unavailability — connection error

## How this service works

Mean first-order surface gradient across the analysis grid. The coordinate is validated against the Natural Earth boundary for Ireland; results outside it are rejected before payment.

## Output

A numeric value representing the mean first-order surface gradient (slope) across the analysis grid cell for the submitted coordinate within Ireland. Requests with coordinates outside the Ireland boundary are rejected before any charge is applied.

## 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-ireland-mean-surface-slope-2933e9e4/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)