solar.halowerk.com
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.
Offering
- Provider
- solar.halowerk.com
- Method
- POST
- Offering type
- Api Endpoint
- Transport type
- http
- Category
- Weather And Environment
- Delivery
- Not provided
- Pricing model
- Not provided
- x402 version
- 2
Endpoint context
- URL
https://solar.halowerk.com/building-heat-demand- MIME type
- Not provided
- First seen
- 2026-10-16T01:58:26.121Z
- Last seen
- Tags
- None supplied
Payment pricing
x402 payment terms are the authoritative price for calling this endpoint.
- Payment option 1
- 0.004 USDC
Atomic price: 4000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
{
"scheme": "exact",
"network": "eip155:8453",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "4000",
"payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E"
}
]Observed health
- Status
- Healthy
- Latest latency
- 1199 ms
- Average latency
- 1229 ms
- HTTP status
- 204
- Last checked
- Reachability
- 85.7% over 7 checks
Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.
Input schema
{
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"examples": [
{
"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
}
}
],
"properties": {
"domestic_hot_water_kwh_year": {
"default": 0,
"maximum": 1000000,
"minimum": 0,
"type": "number"
},
"envelope": {
"items": {
"additionalProperties": false,
"properties": {
"area_m2": {
"maximum": 100000,
"minimum": 0.1,
"type": "number"
},
"name": {
"maxLength": 80,
"minLength": 1,
"type": "string"
},
"u_value_w_m2k": {
"maximum": 8,
"minimum": 0.01,
"type": "number"
}
},
"required": [
"name",
"area_m2",
"u_value_w_m2k"
],
"type": "object"
},
"maxItems": 40,
"minItems": 1,
"type": "array"
},
"heated_floor_area_m2": {
"maximum": 100000,
"minimum": 5,
"type": "number"
},
"heated_volume_m3": {
"maximum": 1000000,
"minimum": 10,
"type": "number"
},
"lat": {
"description": "Latitude in Germany; the DWD normal dataset used here covers Germany.",
"maximum": 56,
"minimum": 47,
"type": "number"
},
"lon": {
"maximum": 16,
"minimum": 5,
"type": "number"
},
"max_station_distance_km": {
"default": 80,
"maximum": 200,
"minimum": 1,
"type": "number"
},
"profile": {
"additionalProperties": false,
"properties": {
"heating_base_temp_c": {
"default": 15,
"maximum": 25,
"minimum": 0,
"type": "number"
},
"indoor_temp_c": {
"default": 20,
"maximum": 30,
"minimum": 5,
"type": "number"
},
"internal_gains_w": {
"default": 0,
"maximum": 100000,
"minimum": 0,
"type": "number"
}
},
"type": "object"
},
"system_efficiency": {
"default": 1,
"maximum": 1.5,
"minimum": 0.5,
"type": "number"
},
"thermal_bridge_w_k": {
"default": 0,
"maximum": 100000,
"minimum": 0,
"type": "number"
},
"ventilation": {
"additionalProperties": false,
"properties": {
"air_changes_per_hour": {
"default": 0.5,
"maximum": 5,
"minimum": 0,
"type": "number"
},
"heat_recovery_efficiency": {
"default": 0,
"maximum": 0.95,
"minimum": 0,
"type": "number"
}
},
"type": "object"
}
},
"required": [
"lat",
"lon",
"heated_floor_area_m2",
"heated_volume_m3",
"envelope"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
}Output schema
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"examples": [
{
"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
}
}
],
"properties": {
"domestic_hot_water_kwh_year": {
"default": 0,
"maximum": 1000000,
"minimum": 0,
"type": "number"
},
"envelope": {
"items": {
"additionalProperties": false,
"properties": {
"area_m2": {
"maximum": 100000,
"minimum": 0.1,
"type": "number"
},
"name": {
"maxLength": 80,
"minLength": 1,
"type": "string"
},
"u_value_w_m2k": {
"maximum": 8,
"minimum": 0.01,
"type": "number"
}
},
"required": [
"name",
"area_m2",
"u_value_w_m2k"
],
"type": "object"
},
"maxItems": 40,
"minItems": 1,
"type": "array"
},
"heated_floor_area_m2": {
"maximum": 100000,
"minimum": 5,
"type": "number"
},
"heated_volume_m3": {
"maximum": 1000000,
"minimum": 10,
"type": "number"
},
"lat": {
"description": "Latitude in Germany; the DWD normal dataset used here covers Germany.",
"maximum": 56,
"minimum": 47,
"type": "number"
},
"lon": {
"maximum": 16,
"minimum": 5,
"type": "number"
},
"max_station_distance_km": {
"default": 80,
"maximum": 200,
"minimum": 1,
"type": "number"
},
"profile": {
"additionalProperties": false,
"properties": {
"heating_base_temp_c": {
"default": 15,
"maximum": 25,
"minimum": 0,
"type": "number"
},
"indoor_temp_c": {
"default": 20,
"maximum": 30,
"minimum": 5,
"type": "number"
},
"internal_gains_w": {
"default": 0,
"maximum": 100000,
"minimum": 0,
"type": "number"
}
},
"type": "object"
},
"system_efficiency": {
"default": 1,
"maximum": 1.5,
"minimum": 0.5,
"type": "number"
},
"thermal_bridge_w_k": {
"default": 0,
"maximum": 100000,
"minimum": 0,
"type": "number"
},
"ventilation": {
"additionalProperties": false,
"properties": {
"air_changes_per_hour": {
"default": 0.5,
"maximum": 5,
"minimum": 0,
"type": "number"
},
"heat_recovery_efficiency": {
"default": 0,
"maximum": 0.95,
"minimum": 0,
"type": "number"
}
},
"type": "object"
}
},
"required": [
"lat",
"lon",
"heated_floor_area_m2",
"heated_volume_m3",
"envelope"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}