Automotive Calculators
Towing check in pounds: payload left after people, cargo and tongue weight, tow rating and combined weight limits.
OtherLiveeip155:8453Exactvia cdp
AutomotiveTowingPayloadTrailerCalculator
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",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact",
"network": "base",
"mimeType": "application/json",
"resource": "https://automotive-calc.x402tookit.com/towing-payload",
"description": "Towing check in pounds: payload left after people, cargo and tongue weight, tow rating and combined weight limits.",
"outputSchema": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"gcwr": 13500,
"gvwr": 6800,
"towRating": 7500,
"curbWeight": 4900,
"tonguePercent": 12,
"trailerWeight": 6000,
"occupantsAndCargo": 600
}
},
"output": {
"asOf": "2026-10-11T14:38:38.697Z",
"gcwrLb": 13500,
"issues": [],
"source": "computed locally",
"reasons": [
"Payload = GVWR - curb weight; tongue weight counts against payload.",
"Combined weight = curb + people and cargo + trailer, compared with GCWR."
],
"summary": "Within the ratings you entered: payload 1900 lb, tongue weight 720 lb, 580 lb of payload left; trailer 6000 of 7500 lb rated.",
"verdict": "WITHIN_ENTERED_RATINGS",
"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": [
"axle ratings, tire load ratings, hitch class and receiver ratings, which can each be lower than the numbers here",
"braking, trailer brake controllers, stability and local laws",
"…2 more"
],
"towRatingLb": 7500,
"payloadUsedLb": 1320,
"tongueWeightLb": 720,
"gcwrRemainingLb": 2000,
"trailerWeightLb": 6000,
"combinedWeightLb": 11500,
"payloadCapacityLb": 1900,
"payloadRemainingLb": 580,
"occupantsAndCargoLb": 600,
"towRatingRemainingLb": 1500,
"trailerAsPercentOfTowRating": 80
}
},
"maxAmountRequired": "20000",
"maxTimeoutSeconds": 300
},
{
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"
},
"payTo": "DUPiupXtuox38dcGoXUKer5mAydCzmaHjrbQ66qeEm8s",
"scheme": "exact",
"network": "solana",
"mimeType": "application/json",
"resource": "https://automotive-calc.x402tookit.com/towing-payload",
"description": "Towing check in pounds: payload left after people, cargo and tongue weight, tow rating and combined weight limits.",
"outputSchema": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"gcwr": 13500,
"gvwr": 6800,
"towRating": 7500,
"curbWeight": 4900,
"tonguePercent": 12,
"trailerWeight": 6000,
"occupantsAndCargo": 600
}
},
"output": {
"asOf": "2026-10-11T14:38:38.697Z",
"gcwrLb": 13500,
"issues": [],
"source": "computed locally",
"reasons": [
"Payload = GVWR - curb weight; tongue weight counts against payload.",
"Combined weight = curb + people and cargo + trailer, compared with GCWR."
],
"summary": "Within the ratings you entered: payload 1900 lb, tongue weight 720 lb, 580 lb of payload left; trailer 6000 of 7500 lb rated.",
"verdict": "WITHIN_ENTERED_RATINGS",
"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": [
"axle ratings, tire load ratings, hitch class and receiver ratings, which can each be lower than the numbers here",
"braking, trailer brake controllers, stability and local laws",
"…2 more"
],
"towRatingLb": 7500,
"payloadUsedLb": 1320,
"tongueWeightLb": 720,
"gcwrRemainingLb": 2000,
"trailerWeightLb": 6000,
"combinedWeightLb": 11500,
"payloadCapacityLb": 1900,
"payloadRemainingLb": 580,
"occupantsAndCargoLb": 600,
"towRatingRemainingLb": 1500,
"trailerAsPercentOfTowRating": 80
}
},
"maxAmountRequired": "20000",
"maxTimeoutSeconds": 300
},
{
"asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact",
"network": "polygon",
"mimeType": "application/json",
"resource": "https://automotive-calc.x402tookit.com/towing-payload",
"description": "Towing check in pounds: payload left after people, cargo and tongue weight, tow rating and combined weight limits.",
"outputSchema": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"gcwr": 13500,
"gvwr": 6800,
"towRating": 7500,
"curbWeight": 4900,
"tonguePercent": 12,
"trailerWeight": 6000,
"occupantsAndCargo": 600
}
},
"output": {
"asOf": "2026-10-11T14:38:38.697Z",
"gcwrLb": 13500,
"issues": [],
"source": "computed locally",
"reasons": [
"Payload = GVWR - curb weight; tongue weight counts against payload.",
"Combined weight = curb + people and cargo + trailer, compared with GCWR."
],
"summary": "Within the ratings you entered: payload 1900 lb, tongue weight 720 lb, 580 lb of payload left; trailer 6000 of 7500 lb rated.",
"verdict": "WITHIN_ENTERED_RATINGS",
"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": [
"axle ratings, tire load ratings, hitch class and receiver ratings, which can each be lower than the numbers here",
"braking, trailer brake controllers, stability and local laws",
"…2 more"
],
"towRatingLb": 7500,
"payloadUsedLb": 1320,
"tongueWeightLb": 720,
"gcwrRemainingLb": 2000,
"trailerWeightLb": 6000,
"combinedWeightLb": 11500,
"payloadCapacityLb": 1900,
"payloadRemainingLb": 580,
"occupantsAndCargoLb": 600,
"towRatingRemainingLb": 1500,
"trailerAsPercentOfTowRating": 80
}
},
"maxAmountRequired": "20000",
"maxTimeoutSeconds": 300
}
],
"x402Version": 1,
"alsoAvailable": {
"llms": "https://automotive-calc.x402tookit.com/llms.txt",
"catalog": "https://automotive-calc.x402tookit.com/catalog",
"message": "Automotive Calculators has 10 pay-per-call endpoints (Car math for agents: tire size and speedometer error, gearing and RPM, trip fuel, EV efficiency, towing, depreciation, lease versus buy, engines and braking.), from $0.02 a call. See the full menu and send your agents our way.",
"openapi": "https://automotive-calc.x402tookit.com/openapi.json",
"related": [
{
"url": "https://automotive-calc.x402tookit.com/acceleration-estimate",
"path": "/acceleration-estimate",
"what": "Estimate quarter-mile time and trap speed from weight and horsepower (Hale), plus a power…",
"price": "$0.02"
},
{
"url": "https://automotive-calc.x402tookit.com/depreciation",
"path": "/depreciation",
"what": "Vehicle value year by year by straight-line, declining-balance or your own yearly percent…",
"price": "$0.02"
},
{
"url": "https://automotive-calc.x402tookit.com/engine-calc",
"path": "/engine-calc",
"what": "Engine displacement in cc, litres and cubic inches from bore, stroke and cylinders; compr…",
"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
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"amount": "20000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
},
{
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM"
},
"payTo": "DUPiupXtuox38dcGoXUKer5mAydCzmaHjrbQ66qeEm8s",
"amount": "20000",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"maxTimeoutSeconds": 300
},
{
"asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"amount": "20000",
"scheme": "exact",
"network": "eip155:137",
"maxTimeoutSeconds": 300
},
{
"asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"amount": "20000",
"scheme": "exact",
"network": "eip155:42161",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"gcwr": 13500,
"gvwr": 6800,
"towRating": 7500,
"curbWeight": 4900,
"tonguePercent": 12,
"trailerWeight": 6000,
"occupantsAndCargo": 600
}
},
"output": {
"type": "json",
"example": {
"asOf": "2026-10-11T14:38:38.697Z",
"gcwrLb": 13500,
"issues": [],
"source": "computed locally",
"reasons": [
"Payload = GVWR - curb weight; tongue weight counts against payload.",
"Combined weight = curb + people and cargo + trailer, compared with GCWR."
],
"summary": "Within the ratings you entered: payload 1900 lb, tongue weight 720 lb, 580 lb of payload left; trailer 6000 of 7500 lb rated.",
"verdict": "WITHIN_ENTERED_RATINGS",
"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": [
"axle ratings, tire load ratings, hitch class and receiver ratings, which can each be lower than the numbers here",
"braking, trailer brake controllers, stability and local laws",
"…2 more"
],
"towRatingLb": 7500,
"payloadUsedLb": 1320,
"tongueWeightLb": 720,
"gcwrRemainingLb": 2000,
"trailerWeightLb": 6000,
"combinedWeightLb": 11500,
"payloadCapacityLb": 1900,
"payloadRemainingLb": 580,
"occupantsAndCargoLb": 600,
"towRatingRemainingLb": 1500,
"trailerAsPercentOfTowRating": 80
}
}
},
"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": [
"gvwr",
"curbWeight",
"trailerWeight",
"towRating"
],
"properties": {
"gcwr": {
"type": "number",
"description": "Gross combined weight rating, lb, to check the whole rig"
},
"gvwr": {
"type": "number",
"description": "Vehicle gross vehicle weight rating, lb (door-jamb sticker)"
},
"towRating": {
"type": "number",
"description": "Maximum trailer weight the vehicle is rated to tow, lb"
},
"curbWeight": {
"type": "number",
"description": "Vehicle weight empty with fluids, lb"
},
"tonguePercent": {
"type": "number",
"description": "Tongue weight as % of trailer weight, 5 to 30 (default 12; 10 to 15 for a bumper-pull trailer)"
},
"trailerWeight": {
"type": "number",
"description": "Loaded trailer weight, lb"
},
"occupantsAndCargo": {
"type": "number",
"description": "People plus cargo in the vehicle, lb (default 0)"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"properties": {
"asOf": {
"type": [
"null",
"string"
]
},
"gcwrLb": {
"type": [
"null",
"number"
]
},
"issues": {
"type": [
"array",
"null"
]
},
"source": {
"type": [
"null",
"string"
]
},
"reasons": {
"type": [
"array",
"null"
],
"items": {
"type": "string"
}
},
"summary": {
"type": [
"null",
"string"
]
},
"verdict": {
"type": [
"null",
"string"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"notChecked": {
"type": [
"array",
"null"
],
"items": {
"type": "string"
}
},
"towRatingLb": {
"type": [
"null",
"number"
]
},
"payloadUsedLb": {
"type": [
"null",
"number"
]
},
"tongueWeightLb": {
"type": [
"null",
"number"
]
},
"gcwrRemainingLb": {
"type": [
"null",
"number"
]
},
"trailerWeightLb": {
"type": [
"null",
"number"
]
},
"combinedWeightLb": {
"type": [
"null",
"number"
]
},
"payloadCapacityLb": {
"type": [
"null",
"number"
]
},
"payloadRemainingLb": {
"type": [
"null",
"number"
]
},
"occupantsAndCargoLb": {
"type": [
"null",
"number"
]
},
"towRatingRemainingLb": {
"type": [
"null",
"number"
]
},
"trailerAsPercentOfTowRating": {
"type": [
"null",
"number"
]
}
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-10-20 20:45Z
- Last indexed by Roundhouse
- 2026-10-22 12:40Z
- Last enriched (probe, favicon, geo)
- 2026-10-21 01:15Z
- 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 Automotive 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=Automotive%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://automotive-calc.x402tookit.com/towing-payload, 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.