Home Energy Calculators
R-value and U-factor of a wall or roof assembly from layers and thickness, with a framing-fraction correction and heat flow.
OtherLiveeip155:8453Exactvia cdp
EnergyInsulationR-valueHomeCalculator
Calls · 30d
1
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 4 snapshots so far.
$24.31
Verified settled volume
1,175 settlements proven x402 by their on-chain EIP-3009 marker.
$0.020
Listed price
As published in the catalog. Always read the live 402 before paying.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-10-20 20:33Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xb531320805C5BED1D46AEaDcF4F008FDF172DBDaThe wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
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"description": "R-value and U-factor of a wall or roof assembly from layers and thickness, with a framing-fraction correction and heat flow.",
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"method": "GET",
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"cavity": "fiberglass batt:3.5",
"layers": "drywall:0.5; sheathing:0.6r; siding:0.6r",
"deltaTF": 40,
"areaSqFt": 1000,
"includeAirFilms": true,
"framingFractionPercent": 25
}
},
"output": {
"asOf": "2026-10-11T14:31:36.699Z",
"layers": [
{
"r": 0.45,
"layer": "drywall",
"source": "table",
"thicknessInches": 0.5
},
{
"r": 0.6,
"layer": "sheathing",
"source": "given R",
"thicknessInches": null
}
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"source": "computed locally",
"totalR": 10.56,
"uValue": 0.0947,
"framing": {
"cavityR": 11.2,
"framingR": 4.38,
"framingFraction": 0.25,
"lostToFramingPercent": 28.1,
"effectiveCavityLayerR": 8.058
},
"reasons": [
"Series layers add: R_total = sum of R. A cavity with studs is combined in parallel: 1 / R_eff = (1 - f) / R_cavity + f / R_framing.",
"R-value is resistance to heat flow (higher is better); U = 1 / R; heat flow Q = area x temperature difference / R."
],
"summary": "Assembly R-10.6 (U 0.095) with framing, against R-13.7 if the cavity insulation ran unbroken; framing removes 28.1% of the cavity layer's value. Heat flow through 1000 sq ft at 40 F: 3789 BTU/h.",
"verdict": "COMPUTED",
"degraded": false,
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"notChecked": [
"installation quality: gaps, compression and air leakage can cut a batt's real R-value by a quarter or more",
"moisture, aging and temperature effects (polyiso loses R in the cold; cellulose settles)",
"…2 more"
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"heatFlowWatts": 1110,
"airFilmsIncluded": true,
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"source": "given R",
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"source": "computed locally",
"totalR": 10.56,
"uValue": 0.0947,
"framing": {
"cavityR": 11.2,
"framingR": 4.38,
"framingFraction": 0.25,
"lostToFramingPercent": 28.1,
"effectiveCavityLayerR": 8.058
},
"reasons": [
"Series layers add: R_total = sum of R. A cavity with studs is combined in parallel: 1 / R_eff = (1 - f) / R_cavity + f / R_framing.",
"R-value is resistance to heat flow (higher is better); U = 1 / R; heat flow Q = area x temperature difference / R."
],
"summary": "Assembly R-10.6 (U 0.095) with framing, against R-13.7 if the cavity insulation ran unbroken; framing removes 28.1% of the cavity layer's value. Heat flow through 1000 sq ft at 40 F: 3789 BTU/h.",
"verdict": "COMPUTED",
"degraded": false,
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"notChecked": [
"installation quality: gaps, compression and air leakage can cut a batt's real R-value by a quarter or more",
"moisture, aging and temperature effects (polyiso loses R in the cold; cellulose settles)",
"…2 more"
],
"heatFlowWatts": 1110,
"airFilmsIncluded": true,
"heatFlowBtuPerHour": 3788.8,
"nominalRIfNoFraming": 13.7
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"description": "R-value and U-factor of a wall or roof assembly from layers and thickness, with a framing-fraction correction and heat flow.",
"outputSchema": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"cavity": "fiberglass batt:3.5",
"layers": "drywall:0.5; sheathing:0.6r; siding:0.6r",
"deltaTF": 40,
"areaSqFt": 1000,
"includeAirFilms": true,
"framingFractionPercent": 25
}
},
"output": {
"asOf": "2026-10-11T14:31:36.699Z",
"layers": [
{
"r": 0.45,
"layer": "drywall",
"source": "table",
"thicknessInches": 0.5
},
{
"r": 0.6,
"layer": "sheathing",
"source": "given R",
"thicknessInches": null
}
],
"source": "computed locally",
"totalR": 10.56,
"uValue": 0.0947,
"framing": {
"cavityR": 11.2,
"framingR": 4.38,
"framingFraction": 0.25,
"lostToFramingPercent": 28.1,
"effectiveCavityLayerR": 8.058
},
"reasons": [
"Series layers add: R_total = sum of R. A cavity with studs is combined in parallel: 1 / R_eff = (1 - f) / R_cavity + f / R_framing.",
"R-value is resistance to heat flow (higher is better); U = 1 / R; heat flow Q = area x temperature difference / R."
],
"summary": "Assembly R-10.6 (U 0.095) with framing, against R-13.7 if the cavity insulation ran unbroken; framing removes 28.1% of the cavity layer's value. Heat flow through 1000 sq ft at 40 F: 3789 BTU/h.",
"verdict": "COMPUTED",
"degraded": false,
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"notChecked": [
"installation quality: gaps, compression and air leakage can cut a batt's real R-value by a quarter or more",
"moisture, aging and temperature effects (polyiso loses R in the cold; cellulose settles)",
"…2 more"
],
"heatFlowWatts": 1110,
"airFilmsIncluded": true,
"heatFlowBtuPerHour": 3788.8,
"nominalRIfNoFraming": 13.7
}
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"x402Version": 1,
"alsoAvailable": {
"llms": "https://home-energy-calc.x402tookit.com/llms.txt",
"catalog": "https://home-energy-calc.x402tookit.com/catalog",
"message": "Home Energy Calculators has 9 pay-per-call endpoints (Home energy math for agents: bills, appliance loads, solar sizing, heat loss, HVAC load checks, insulation, water heating, EV charging and fuel cost.), from $0.02 a call. See the full menu and send your agents our way.",
"openapi": "https://home-energy-calc.x402tookit.com/openapi.json",
"related": [
{
"url": "https://home-energy-calc.x402tookit.com/solar-sizing",
"path": "/solar-sizing",
"what": "Size a rooftop solar system from annual kWh and peak sun hours: kW, panel count, yearly o…",
"price": "$0.02"
},
{
"url": "https://home-energy-calc.x402tookit.com/water-heater",
"path": "/water-heater",
"what": "Water heater recovery rate (gallons an hour), tank heat-up time and energy cost from inpu…",
"price": "$0.02"
},
{
"url": "https://home-energy-calc.x402tookit.com/heat-loss",
"path": "/heat-loss",
"what": "Heat loss of a building in BTU/h and watts from surface areas and R-values plus air leaka…",
"price": "$0.02"
}
]
}
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.02USDC≈ $0.02 USD
on Base · exact scheme
Pay 0.02 USDC on Base to 0xb531…2DBDa. The signed payment is good for 5 minutes.
- Paid to
- 0xb531…2DBDa
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 20000 smallest units
20000units
on solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- DUPiup…eEm8s
- Token contract
- EPjFWd…TDt1v
- Payment window
- 5 minutes
20000units
on Polygon · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- 0xb531…2DBDa
- Token contract
- 0x3c49…c3359
- Payment window
- 5 minutes
20000units
on Arbitrum · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- 0xb531…2DBDa
- Token contract
- 0xaf88…e5831
- Payment window
- 5 minutes
The catalog’s raw entry
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{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"cavity": "fiberglass batt:3.5",
"layers": "drywall:0.5; sheathing:0.6r; siding:0.6r",
"deltaTF": 40,
"areaSqFt": 1000,
"includeAirFilms": true,
"framingFractionPercent": 25
}
},
"output": {
"type": "json",
"example": {
"asOf": "2026-10-11T14:31:36.699Z",
"layers": [
{
"r": 0.45,
"layer": "drywall",
"source": "table",
"thicknessInches": 0.5
},
{
"r": 0.6,
"layer": "sheathing",
"source": "given R",
"thicknessInches": null
}
],
"source": "computed locally",
"totalR": 10.56,
"uValue": 0.0947,
"framing": {
"cavityR": 11.2,
"framingR": 4.38,
"framingFraction": 0.25,
"lostToFramingPercent": 28.1,
"effectiveCavityLayerR": 8.058
},
"reasons": [
"Series layers add: R_total = sum of R. A cavity with studs is combined in parallel: 1 / R_eff = (1 - f) / R_cavity + f / R_framing.",
"R-value is resistance to heat flow (higher is better); U = 1 / R; heat flow Q = area x temperature difference / R."
],
"summary": "Assembly R-10.6 (U 0.095) with framing, against R-13.7 if the cavity insulation ran unbroken; framing removes 28.1% of the cavity layer's value. Heat flow through 1000 sq ft at 40 F: 3789 BTU/h.",
"verdict": "COMPUTED",
"degraded": false,
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"notChecked": [
"installation quality: gaps, compression and air leakage can cut a batt's real R-value by a quarter or more",
"moisture, aging and temperature effects (polyiso loses R in the cold; cellulose settles)",
"…2 more"
],
"heatFlowWatts": 1110,
"airFilmsIncluded": true,
"heatFlowBtuPerHour": 3788.8,
"nominalRIfNoFraming": 13.7
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"layers"
],
"properties": {
"cavity": {
"type": "string",
"description": "Insulated cavity layer as material:inches or name:Rr (for example 'fiberglass batt:3.5'); with framing it is combined in parallel"
},
"layers": {
"type": "string",
"description": "Lines material:inches or name:Rr separated by semicolons, for example 'drywall:0.5; cavity insulation:3.5r; sheathing:0.6r'. Materials: fiberglass batt, cellulose loose-fill, open-cell spray foam, closed-cell spray foam, eps board, xps board, polyiso board, softwood framing, drywall, plywood"
},
"deltaTF": {
"type": "number",
"description": "Temperature difference in F, with areaSqFt"
},
"areaSqFt": {
"type": "number",
"description": "Surface area in square feet, to get heat flow"
},
"includeAirFilms": {
"type": "boolean",
"description": "true to add the interior and exterior air-film resistances (R-0.68 and R-0.17), default false"
},
"framingDepthInches": {
"type": "number",
"description": "Depth of the framing member in inches (default 3.5 for a 2x4); used with cavity"
},
"framingFractionPercent": {
"type": "number",
"description": "Share of the wall area that is framing, 5 to 40 (default 25, typical for 16-inch spacing)"
}
}
}
},
"additionalProperties": false
},
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"string"
]
},
"layers": {
"type": [
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"items": {
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"properties": {
"r": {
"type": [
"null",
"number"
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},
"layer": {
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"null",
"string"
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},
"source": {
"type": [
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"string"
]
},
"thicknessInches": {
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"number"
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}
}
}
},
"source": {
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},
"totalR": {
"type": [
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"number"
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"uValue": {
"type": [
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"number"
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},
"framing": {
"type": [
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"properties": {
"cavityR": {
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"number"
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"framingR": {
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"number"
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"framingFraction": {
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"number"
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"summary": {
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"string"
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"null"
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"string"
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},
"notChecked": {
"type": [
"array",
"null"
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},
"heatFlowWatts": {
"type": [
"null",
"number"
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"airFilmsIncluded": {
"type": [
"boolean",
"null"
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},
"heatFlowBtuPerHour": {
"type": [
"null",
"number"
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},
"nominalRIfNoFraming": {
"type": [
"null",
"number"
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}
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}
}
}
}Provenance
- Seen in the source catalog
- 2026-10-20 20:33Z
- Last indexed by Roundhouse
- 2026-10-22 06:50Z
- Last enriched (probe, favicon, geo)
- 2026-10-20 23:15Z
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- HTTP 402
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 4 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service Home Energy Calculators and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=Home%20Energy%20Calculators' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://home-energy-calc.x402tookit.com/insulation-r-value, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Either pay over x402 (mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.