# HALOWERK Atlantic Land – Ireland Maximum Surface Slope

> HALOWERK Atlantic Land – Ireland Maximum 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 2026-09-15).

Returns the maximum adjacent-cell surface gradient (steepest slope) across the analysis grid for a given coordinate within Ireland.

## Facts

- Endpoint: POST https://atlantikland.halowerk.com/v1/ie-max-slope
- 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-ireland-maximum-surface-slope-4007c626
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zXzylQa7FTqzl-rtrAo0P

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-maximum-surface-slope-4007c626 -d '<json body>'
```

Example prompt: What's the maximum surface slope at latitude 53.35, longitude -6.26 in Ireland? I need the steepest adjacent-cell gradient for that location.

## When to prefer this

Use this endpoint when you specifically need the maximum (peak) slope gradient at a point in Ireland, as opposed to mean slope. It is ideal for worst-case terrain steepness assessments such as construction feasibility, erosion modeling, or runoff analysis where the steepest local gradient is the critical metric.

## Known failure modes

- Coordinate outside Ireland boundary — request rejected before payment, returns error indicating out-of-bounds location
- Coordinate outside published European coverage range (lat 34–72.5, lon -31.5–40.5) — validation error
- Malformed or missing latitude/longitude values — schema validation error
- Service unavailable or timeout — transient HTTP error

## How this service works

Maximum adjacent-cell 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 maximum adjacent-cell surface gradient (steepest slope) computed across the analysis grid centered on the requested coordinate. Coordinates outside the Ireland Natural Earth boundary 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-atlantic-land-ireland-maximum-surface-slope-4007c626/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)