$0.004
per call · USD Coin on Base
Computes a transparent planning estimate for space-heating demand. The method is not DIN, VDI, GEG or PHPP and must not be used as regulatory proof. It combines transmission heat loss from each envelope component, ventilation heat loss from heated volume and air changes, monthly heating degree days from the nearest DWD 1991-2020 temperature-normal station, stated internal gains and optional domestic hot water.
Endpoint
POST https://solar.halowerk.com/building-heat-demand1
Calls / 30d
1
Unique payers / 30d
Aug 19
Last called
exact
Payment scheme
Call this service
import { wrapFetchWithPayment } from "@x402/fetch";
import { privateKeyToAccount } from "viem/accounts";
const account = privateKeyToAccount(process.env.PRIVATE_KEY);
const fetchWithPay = wrapFetchWithPayment(fetch, account);
const res = await fetchWithPay("https://solar.halowerk.com/building-heat-demand", {
method: "POST",
headers: { "Content-Type": "application/json" },
body: JSON.stringify({
"domestic_hot_water_kwh_year": 1800,
"envelope": [
{
"area_m2": 168,
"name": "external walls",
"u_value_w_m2k": 0.22
},
{
"area_m2": 118,
"name": "roof",
"u_value_w_m2k": 0.16
},
{
"area_m2": 92,
"name": "ground floor",
"u_value_w_m2k": 0.25
},
{
"area_m2": 31,
"name": "windows",
"u_value_w_m2k": 0.95
}
],
"heated_floor_area_m2": 145,
"heated_volume_m3": 365,
"lat": 52.52,
"lon": 13.405,
"max_station_distance_km": 70,
"profile": {
"heating_base_temp_c": 15,
"indoor_temp_c": 20,
"internal_gains_w": 350
},
"system_efficiency": 0.92,
"ventilation": {
"air_changes_per_hour": 0.45,
"heat_recovery_efficiency": 0.15
}
}),
});
const data = await res.json();curl -X POST \
"https://solar.halowerk.com/building-heat-demand" \
-H "Content-Type: application/json" \
-d '{"domestic_hot_water_kwh_year":1800,"envelope":[{"area_m2":168,"name":"external walls","u_value_w_m2k":0.22},{"area_m2":118,"name":"roof","u_value_w_m2k":0.16},{"area_m2":92,"name":"ground floor","u_value_w_m2k":0.25},{"area_m2":31,"name":"windows","u_value_w_m2k":0.95}],"heated_floor_area_m2":145,"heated_volume_m3":365,"lat":52.52,"lon":13.405,"max_station_distance_km":70,"profile":{"heating_base_temp_c":15,"indoor_temp_c":20,"internal_gains_w":350},"system_efficiency":0.92,"ventilation":{"air_changes_per_hour":0.45,"heat_recovery_efficiency":0.15}}' \
-H "X-PAYMENT: <signed x402 payment>"Payment details
0x2880edfff13100677bf97a3cbdf3bc34771c4e5eUSD Coin · 0x833589fcd6edb6e08f4c7c32d4f71b54bda02913Is this your API?
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