# HALOWERK Eastern Land – Romania Maximum Slope (ro-max-slope)

> HALOWERK Eastern Land – Romania Maximum Slope (ro-max-slope) is a paid API for AI agents from ostland.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 an analysis grid cell for a given WGS84 coordinate within Romania.

## Facts

- Endpoint: POST https://ostland.halowerk.com/v1/ro-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-eastern-land-romania-maximum-slope-ro-max-slope-99cdbf82
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WzO9d7LlQ35mP34rw_dIC

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-eastern-land-romania-maximum-slope-ro-max-slope-99cdbf82 -d '<json body>'
```

Example prompt: What is the maximum adjacent-cell slope gradient at latitude 45.75, longitude 24.23 in Romania? I need the steepest terrain value for that location.

## When to prefer this

Choose this endpoint when you need the maximum (peak) slope gradient at a specific point in Romania, as opposed to the mean slope. It is particularly useful for worst-case terrain assessments such as erosion risk, machinery accessibility, or construction suitability screening. Prefer this over the mean slope endpoint when identifying the steepest micro-terrain feature within a grid cell matters. This is Romania-specific; use a different sibling endpoint for other European countries.

## Known failure modes

- Coordinate outside Romania boundary: rejected before payment with a boundary validation error
- Coordinate outside the published European coverage range (lat 34–72.5, lon -31.5–40.5): validation error
- Missing or malformed latitude/longitude fields: schema validation error
- Payment failure via x402 protocol: request not processed
- Server-side terrain data unavailability: upstream data error

## How this service works

Maximum adjacent-cell surface gradient across the analysis grid. The coordinate is validated against the Natural Earth boundary for Romania; results outside it are rejected before payment.

## Output

A numeric value representing the maximum adjacent-cell surface gradient (steepest slope angle or ratio) computed across the analysis grid at the requested Romanian coordinate. The coordinate is validated against the Natural Earth boundary for Romania before computation; requests outside Romania are rejected and return an error without incurring a charge.

## 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-eastern-land-romania-maximum-slope-ro-max-slope-99cdbf82/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ostland.halowerk.com](https://www.zero.xyz/host/ostland.halowerk.com/llms.txt)