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Karte Halowerk Quiet Site Noise Context
x402
Karte Halowerk Quiet Site Noise Context is a paid API for AI agents from karte.halowerk.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Builds a weighted noise context for a site by analysing surrounding roads (by class, speed limit, lane count, and distance) and railways (by usage class) within a given radius.
Price / call$0.005
Success—
StatusUnknown
How this service works
Builds a noise context for a site from what surrounds it. Roads within the radius are weighted by class, by recorded speed limit and lane count where present, and by distance with a falloff, because a motorway at eight hundred metres and a residential street at twenty are different problems. Railways are counted separately with their usage class, since freight lines at night dominate what people actually complain about.
Output
Returns a structured noise context object for the site, including weighted road noise contributions (segmented by road class, recorded speed limit, lane count, and distance falloff) and separate railway noise contributions (segmented by usage class), giving an overall acoustic exposure profile for the location.
Example use cases
Pre-purchase residential property noise check
“I'm thinking of buying a flat at 52.4862, -1.8904 — can you give me the noise context within 500 metres, accounting for road class, speed limits, and any nearby railway lines?”
Planning application acoustic assessment
“We're submitting a planning application for a mixed-use development at 53.4808, -2.2426. Can you build the noise context for the site with an 800-metre radius so we can document the road and rail noise exposure?”
Freight rail impact on night-time noise
“There's a site I'm evaluating at 51.4545, -2.5879 near what I think is a freight railway. Can you run the quiet-site noise context at 700 metres radius so I can see how the railway usage class is weighted compared to the surrounding roads?”
Technical details
Endpoint
POSThttps://karte.halowerk.com/v1/quiet-siteWhen to prefer
Choose this endpoint when you need a quantitative, source-differentiated noise context for a specific geographic point — particularly when road class hierarchy, speed limits, lane counts, and railway usage class all matter (e.g. planning assessments, property due diligence, environmental reporting). Prefer it over generic isochrone or POI endpoints when the question is specifically about acoustic exposure from transport infrastructure rather than amenity proximity.
Side effects
- Coordinate outside supported coverage area returns an error or empty result
- Radius too large may time out or return a degraded response
- Missing or unparseable coordinate values return a validation error
- No roads or railways within radius returns a zero-noise context
- OpenStreetMap data gaps may cause incomplete road/rail inventories for some regions
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| lat | number | |
| lon | number | |
| radius_m | integer |
Tags
x402
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