# Services from natur.halowerk.com on Zero > natur.halowerk.com serves 25 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero. Canonical page: https://www.zero.xyz/host/natur.halowerk.com Live health (JSON, refreshed every minute): https://www.zero.xyz/host/natur.halowerk.com/health.json ## Services - [FAO-56 Penman-Monteith Irrigation Need Calculator](https://www.zero.xyz/c/fao-56-penman-monteith-irrigation-need-calculator-79623a45/llms.txt): $0.005/call via x402. Computes daily crop water deficit using the FAO-56 Penman-Monteith reference evapotranspiration method, applies a crop coefficient, subtracts effective rainfall, and returns the daily and cumulative irrigation need. - [Runway Crosswind & Headwind Component Calculator](https://www.zero.xyz/c/runway-crosswind-headwind-component-calculator-59bcd7bf/llms.txt): $0.005/call via x402. Given an airport and current wind conditions, computes headwind/tailwind and crosswind components for each runway direction using OSM runway geometry. - [Halowerk Volcanic Ash Route Checker](https://www.zero.xyz/c/halowerk-volcanic-ash-route-checker-8e2e5c0f/llms.txt): $0.006/call via x402. Samples a flight route at a chosen spacing and checks every sample point against active volcanic ash SIGMETs, returning affected segments, ash layer altitudes, SIGMET metadata, and raw text for each intersection. - [Natur Growing Degree Days Calculator](https://www.zero.xyz/c/natur-growing-degree-days-calculator-47ada80a/llms.txt): $0.005/call via x402. Accumulates growing degree days (GDD) at a geographic location from hourly forecast data using both hourly integration and the conventional daily max/min average methods, with the difference between them stated. - [Natur Halowerk Noise Level](https://www.zero.xyz/c/natur-halowerk-noise-level-77ecde0d/llms.txt): $0.006/call via x402. 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. - [Canadian Fire Weather Index Calculator](https://www.zero.xyz/c/canadian-fire-weather-index-calculator-49041edb/llms.txt): $0.005/call via x402. Computes all components of the Canadian Fire Weather Index system (FFMC, DMC, DC, ISI, BUI, FWI) from an hourly forecast to quantify wildfire ignition and spread risk. - [Halowerk Leak Indicator API](https://www.zero.xyz/c/halowerk-leak-indicator-api-cca978d2/llms.txt): $0.005/call via x402. Analyzes flow and pressure time series for water distribution zones to compute minimum night flow, infrastructure leakage index, and night pressure trend as independent leak indicators, then ranks all submitted zones by leak severity. - [Natur Halowerk Solar Storm / Geomagnetic Activity Assembler](https://www.zero.xyz/c/natur-halowerk-solar-storm-geomagnetic-activity-assembler-4dfa4c75/llms.txt): $0.004/call via x402. Assembles current geomagnetic activity data from four NOAA sources, returning Kp index, G-scale storm levels, and guidance on what each data source is best suited for. - [Natur Halowerk Earthquake Brief](https://www.zero.xyz/c/natur-halowerk-earthquake-brief-d576ed20/llms.txt): $0.004/call via x402. Returns a single earthquake in decision-ready form — by USGS event ID or as the most significant matching event — including magnitude with its type (e.g. Mw, ML) - [Natur Species Taxonomy Lookup](https://www.zero.xyz/c/natur-species-taxonomy-lookup-24628bbb/llms.txt): $0.004/call via x402. Resolves a scientific or vernacular species name to its accepted taxon, returning full classification hierarchy, taxonomic authority, GBIF key, linked identifiers, and synonym/accepted-name status. - [Natur HaloWerk Satellite Change Diff (HLS)](https://www.zero.xyz/c/natur-halowerk-satellite-change-diff-hls-508435e2/llms.txt): $0.015/call via x402. Compares NASA GIBS Harmonized Landsat Sentinel-2 (HLS) imagery for two dates at a geographic coordinate window, reporting pixel-level RGB change and heuristics for built-up area, water/flooding, and vegetation loss. - [Natur Halowerk Earthquake Sequence Clustering](https://www.zero.xyz/c/natur-halowerk-earthquake-sequence-clustering-c798375b/llms.txt): $0.005/call via x402. Clusters earthquake events close in space and time into sequences using single-link clustering, returning the strongest event, preceding and following events, duration, spatial extent, magnitude range, and daily event rate. - [Natur Species Occurrence Lookup](https://www.zero.xyz/c/natur-species-occurrence-lookup-e53dc737/llms.txt): $0.005/call via x402. Retrieves georeferenced occurrence records for a species within a radius of a coordinate, annotating each with observation date, coordinate uncertainty, basis of record, publishing dataset, and licence. - [Halowerk Aviation Weather Brief](https://www.zero.xyz/c/halowerk-aviation-weather-brief-4f87e622/llms.txt): $0.005/call via x402. Fetches a consolidated aviation weather brief for one or more airports, including current METAR observation, terminal forecast (TAF), nearby PIREPs, and active SIGMETs in a single response. - [Natur Biodiversity Density Assessment](https://www.zero.xyz/c/natur-biodiversity-density-assessment-7a248022/llms.txt): $0.006/call via x402. Assesses recorded biodiversity around a geographic point, returning species count, record count, data recency, dataset count, and kingdom-level breakdown while flagging the observer-density caveat. - [Marine Species Taxonomic Lookup](https://www.zero.xyz/c/marine-species-taxonomic-lookup-cf977f7d/llms.txt): $0.004/call via x402. Looks up a marine organism by name in the World Register of Marine Species (WoRMS) and returns the accepted name, AphiaID, authority, rank, full classification, and taxonomic status with precise status terminology. - [USGS Streamgage Instantaneous Values with Historical Percentile Context](https://www.zero.xyz/c/usgs-streamgage-instantaneous-values-with-historical-percentile-context-de01a96f/llms.txt): $0.004/call via x402. Returns the current instantaneous reading at a USGS streamgage station alongside historical context (min, median, max, and percentile) for a specified reference period. - [Natur Halowerk Seismic Proximity Exposure](https://www.zero.xyz/c/natur-halowerk-seismic-proximity-exposure-9270ddad/llms.txt): $0.005/call via x402. Retrieves earthquakes within a radius and time window around a point and computes a cumulative seismic exposure figure weighted by magnitude and distance using an explicit formula. - [Frost Window Analyzer](https://www.zero.xyz/c/frost-window-analyzer-95ade401/llms.txt): $0.005/call via x402. Converts an hourly temperature forecast into discrete continuous frost windows with start/end hours, duration, minimum temperature, and the hour that minimum occurs. - [Natur River Anomaly Detector](https://www.zero.xyz/c/natur-river-anomaly-detector-97ffae42/llms.txt): $0.005/call via x402. Compares a river gauge's recent readings against its historical baseline to detect extreme water levels and unusual rates of rise that may signal flooding - [Water Quality Results Normalizer](https://www.zero.xyz/c/water-quality-results-normalizer-77fea53e/llms.txt): $0.005/call via x402. Retrieves water quality measurement results for a monitoring site from the Water Quality Portal and normalizes units (mg/L, ug/L, ppm, etc.) into a consistent, comparable shape to prevent factor-of-thousand errors in downstream analysis. - [DWD Climate Normals by Coordinate](https://www.zero.xyz/c/dwd-climate-normals-by-coordinate-3a200a99/llms.txt): $0.005/call via x402. Returns German Weather Service (DWD) reference-period climate normals for the nearest station to a given coordinate, including monthly means and annual totals for temperature, precipitation, and sunshine, plus annual counts of frost, ice, summer, and hot days. - [Natur Halowerk Seasonal Species Profile](https://www.zero.xyz/c/natur-halowerk-seasonal-species-profile-3ff373dc/llms.txt): $0.005/call via x402. Builds an effort-corrected monthly occurrence profile for a species near a given point, showing when it is genuinely active rather than when observers happen to be outdoors. - [Taxon Synonym Graph Builder](https://www.zero.xyz/c/taxon-synonym-graph-builder-a9add664/llms.txt): $0.006/call via x402. Assembles a cross-register synonym graph for a taxon, comparing GBIF and WoRMS name treatments to reveal disagreements in accepted/synonym/species status - [GNSS Degradation Estimator](https://www.zero.xyz/c/gnss-degradation-estimator-23d0c37f/llms.txt): $0.004/call via x402. Estimates the likelihood and magnitude of satellite navigation degradation from ionospheric delay errors and geomagnetic activity, distinguishing between single-frequency and dual-frequency receiver impacts. Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently. - [Zero catalog index](https://www.zero.xyz/llms.txt)