Construction Calculators
Convert roof pitch (rise per 12), angle or percent slope; get the rafter length multiplier and roof area factor.
OtherLiveeip155:8453Exactvia cdp
RoofPitchRafterSlopeCarpentry
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 20:45Z
—
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.
{
"error": "Payment required",
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"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact",
"network": "base",
"mimeType": "application/json",
"resource": "https://construction-calc.x402tookit.com/roof-pitch",
"description": "Convert roof pitch (rise per 12), angle or percent slope; get the rafter length multiplier and roof area factor.",
"outputSchema": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"pitch": 6,
"runFt": 12
}
},
"output": {
"asOf": "2026-10-11T14:25:13.674Z",
"class": "conventional",
"source": "computed locally",
"reasons": [
"Rafter and roof surface area both scale by sqrt(1 + (rise/12)^2) compared with the flat footprint.",
"Pitch is rise per 12 inches of horizontal run."
],
"summary": "6:12 pitch = 26.565 degrees = 50% slope; rafter length is 1.11803 x the horizontal run, so 13.4164 ft for a 12 ft run (conventional).",
"verdict": "COMPUTED",
"angleDeg": 26.5651,
"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": [
"overhangs, eaves, hips and valleys (which lengthen rafters and change area)",
"structural sizing, spacing and snow or wind loads",
"…1 more"
],
"slopePercent": 50,
"areaMultiplier": 1.118034,
"pitchRisePer12": 6,
"rafterLengthFt": 13.41641,
"rafterMultiplier": 1.118034
}
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"resource": "https://construction-calc.x402tookit.com/roof-pitch",
"description": "Convert roof pitch (rise per 12), angle or percent slope; get the rafter length multiplier and roof area factor.",
"outputSchema": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"pitch": 6,
"runFt": 12
}
},
"output": {
"asOf": "2026-10-11T14:25:13.674Z",
"class": "conventional",
"source": "computed locally",
"reasons": [
"Rafter and roof surface area both scale by sqrt(1 + (rise/12)^2) compared with the flat footprint.",
"Pitch is rise per 12 inches of horizontal run."
],
"summary": "6:12 pitch = 26.565 degrees = 50% slope; rafter length is 1.11803 x the horizontal run, so 13.4164 ft for a 12 ft run (conventional).",
"verdict": "COMPUTED",
"angleDeg": 26.5651,
"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": [
"overhangs, eaves, hips and valleys (which lengthen rafters and change area)",
"structural sizing, spacing and snow or wind loads",
"…1 more"
],
"slopePercent": 50,
"areaMultiplier": 1.118034,
"pitchRisePer12": 6,
"rafterLengthFt": 13.41641,
"rafterMultiplier": 1.118034
}
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"scheme": "exact",
"network": "polygon",
"mimeType": "application/json",
"resource": "https://construction-calc.x402tookit.com/roof-pitch",
"description": "Convert roof pitch (rise per 12), angle or percent slope; get the rafter length multiplier and roof area factor.",
"outputSchema": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"pitch": 6,
"runFt": 12
}
},
"output": {
"asOf": "2026-10-11T14:25:13.674Z",
"class": "conventional",
"source": "computed locally",
"reasons": [
"Rafter and roof surface area both scale by sqrt(1 + (rise/12)^2) compared with the flat footprint.",
"Pitch is rise per 12 inches of horizontal run."
],
"summary": "6:12 pitch = 26.565 degrees = 50% slope; rafter length is 1.11803 x the horizontal run, so 13.4164 ft for a 12 ft run (conventional).",
"verdict": "COMPUTED",
"angleDeg": 26.5651,
"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": [
"overhangs, eaves, hips and valleys (which lengthen rafters and change area)",
"structural sizing, spacing and snow or wind loads",
"…1 more"
],
"slopePercent": 50,
"areaMultiplier": 1.118034,
"pitchRisePer12": 6,
"rafterLengthFt": 13.41641,
"rafterMultiplier": 1.118034
}
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"maxAmountRequired": "20000",
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}
],
"x402Version": 1,
"alsoAvailable": {
"llms": "https://construction-calc.x402tookit.com/llms.txt",
"catalog": "https://construction-calc.x402tookit.com/catalog",
"message": "Construction Calculators has 10 pay-per-call endpoints (Materials and layout maths for concrete, paint, stairs, roofs, lumber, tile, drywall, fences and decks.), from $0.02 a call. See the full menu and send your agents our way.",
"openapi": "https://construction-calc.x402tookit.com/openapi.json",
"related": [
{
"url": "https://construction-calc.x402tookit.com/stair-calc",
"path": "/stair-calc",
"what": "Stair layout from total rise: number of risers, exact riser height, total run, stringer l…",
"price": "$0.02"
},
{
"url": "https://construction-calc.x402tookit.com/tile-calc",
"path": "/tile-calc",
"what": "Tiles needed for a floor or wall from area or room size, tile size, grout gap and waste,…",
"price": "$0.02"
},
{
"url": "https://construction-calc.x402tookit.com/board-feet",
"path": "/board-feet",
"what": "Board feet for lumber from thickness, width, length and quantity (nominal sizes), with to…",
"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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"scheme": "exact",
"network": "eip155:8453",
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"payTo": "DUPiupXtuox38dcGoXUKer5mAydCzmaHjrbQ66qeEm8s",
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{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"pitch": 6,
"runFt": 12
}
},
"output": {
"type": "json",
"example": {
"asOf": "2026-10-11T14:25:13.674Z",
"class": "conventional",
"source": "computed locally",
"reasons": [
"Rafter and roof surface area both scale by sqrt(1 + (rise/12)^2) compared with the flat footprint.",
"Pitch is rise per 12 inches of horizontal run."
],
"summary": "6:12 pitch = 26.565 degrees = 50% slope; rafter length is 1.11803 x the horizontal run, so 13.4164 ft for a 12 ft run (conventional).",
"verdict": "COMPUTED",
"angleDeg": 26.5651,
"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": [
"overhangs, eaves, hips and valleys (which lengthen rafters and change area)",
"structural sizing, spacing and snow or wind loads",
"…1 more"
],
"slopePercent": 50,
"areaMultiplier": 1.118034,
"pitchRisePer12": 6,
"rafterLengthFt": 13.41641,
"rafterMultiplier": 1.118034
}
}
},
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],
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},
"queryParams": {
"type": "object",
"required": [],
"properties": {
"pitch": {
"type": "number",
"description": "Rise per 12 in of run, for example 6 for 6:12"
},
"runFt": {
"type": "number",
"description": "Horizontal run in feet, to get the rafter length"
},
"percent": {
"type": "number",
"description": "Slope percent (instead of pitch)"
},
"angleDeg": {
"type": "number",
"description": "Roof angle in degrees (instead of pitch)"
}
}
}
},
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"type": [
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"number"
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"type": [
"null",
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}
}Provenance
- Seen in the source catalog
- 2026-10-20 20:45Z
- Last indexed by Roundhouse
- 2026-10-22 19:30Z
- Last enriched (probe, favicon, geo)
- 2026-10-20 22:45Z
- 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 Construction 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=Construction%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://construction-calc.x402tookit.com/roof-pitch, 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.