# Natur Halowerk Noise Level

> Natur Halowerk Noise Level is a paid API for AI agents from natur.halowerk.com, paid per call via x402, $0.006/call, status unknown (last checked 2026-09-16).

Returns community sensor noise readings (LAeq, median, p10, p90) for outdoor sensors within a specified radius of a coordinate, sourced from Sensor.Community live data.

## Facts

- Endpoint: POST https://natur.halowerk.com/v1/noise-level
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/natur-halowerk-noise-level-77ecde0d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Q8a7w_gbPdx11InDm3F-l

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 natur-halowerk-noise-level-77ecde0d -d '<json body>'
```

Example prompt: What are the community sensor noise levels within 3 km of latitude 48.1351 and longitude 11.5820 — give me up to 15 sensors with the median, p10, and p90 LAeq readings?

## When to prefer this

Choose this endpoint when you need real-time, community-sourced environmental noise statistics for a geographic area, particularly when statistical distribution (median, p10, p90) across multiple sensors matters more than a single point reading. Best suited for exploratory environmental assessments, neighborhood comparisons, or research aggregation where indicative rather than regulatory-grade measurements are sufficient. Not appropriate when legally calibrated noise measurements or day/night regulatory limit comparisons are required.

## Known failure modes

- No sensors found within the requested radius — returns empty sensor list with no statistics
- Radius exceeds 25 km maximum or falls below 0.5 km — returns validation error
- Invalid latitude/longitude values outside allowed ranges — returns 400-level error
- Sensor.Community live feed temporarily unavailable — may return stale or empty data
- max_sensors capped at 30; requests for more are silently truncated to maximum

## How this service works

Queries the Sensor.Community live area feed, keeps the newest noise reading per outdoor sensor within the requested radius, and returns nearest readings plus median, p10 and p90 LAeq. It never converts missing sensors into an estimated dB value. Community sensors are indicative rather than calibrated regulatory measurements; no day/night legal limit or property valuation is inferred.

## Output

Returns an array of the nearest outdoor noise sensor readings (up to max_sensors), each with sensor ID, distance, and LAeq value, along with aggregate statistics: median LAeq, p10, and p90 across all sensors found. Sensors with missing values are excluded rather than estimated.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "latitude": {
   "type": "number",
   "maximum": 90,
   "minimum": -90
  },
  "longitude": {
   "type": "number",
   "maximum": 180,
   "minimum": -180
  },
  "radius_km": {
   "type": "number",
   "default": 5,
   "maximum": 25,
   "minimum": 0.5
  },
  "max_sensors": {
   "type": "integer",
   "default": 10,
   "maximum": 30,
   "minimum": 1
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/natur-halowerk-noise-level-77ecde0d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from natur.halowerk.com](https://www.zero.xyz/host/natur.halowerk.com/llms.txt)