Automotive Calculators
EV efficiency in kWh per 100 miles, miles per kWh, Wh per km and MPGe, range from battery size, and cost versus a gas car.
OtherLiveeip155:8453Exactvia cdp
AutomotiveEvEfficiencyMpgeCalculator
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/ev-efficiency",
"description": "EV efficiency in kWh per 100 miles, miles per kWh, Wh per km and MPGe, range from battery size, and cost versus a gas car.",
"outputSchema": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"unit": "kwh_per_100mi",
"gasMpg": 30,
"batteryKwh": 75,
"efficiency": 28,
"pricePerKwh": 0.16,
"gasPricePerGallon": 3.5
}
},
"output": {
"asOf": "2026-10-11T14:38:37.138Z",
"mpge": 120.38,
"source": "computed locally",
"rangeKm": 431.1,
"reasons": [
"MPGe = miles per kWh x 33.705 (EPA: one gallon of gasoline holds the energy of 33.705 kWh).",
"1 mile = 1.609344 km."
],
"summary": "3.571 miles per kWh = 28 kWh per 100 miles = 174 Wh per km = 120.4 MPGe. A 75 kWh battery goes about 267.9 miles (431.1 km). At 0.16 per kWh that is 0.0448 per mile, 538 a year for 12000 miles. The ga…",
"verdict": "COMPUTED",
"whPerKm": 173.98,
"degraded": false,
"kmPerKwh": 5.7477,
"annualKwh": 3360,
"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": [
"real-world range: speed, cold weather, climate control, wheels, load and battery age cut range by 10 to 40%",
"charging losses (about 10% from wall to battery; see /ev-charging)",
"…2 more"
],
"rangeMiles": 267.9,
"costPerMile": 0.0448,
"kwhPer100Km": 17.398,
"milesPerKwh": 3.5714,
"gasAnnualCost": 1400,
"gasCostPerMile": 0.1167,
"kwhPer100Miles": 28,
"annualEnergyCost": 538,
"annualSavingsVsGas": 862,
"kwhPerGallonEquivalent": 33.705,
"breakEvenElectricityPricePerKwh": 0.4167
}
},
"maxAmountRequired": "20000",
"maxTimeoutSeconds": 300
},
{
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"
},
"payTo": "DUPiupXtuox38dcGoXUKer5mAydCzmaHjrbQ66qeEm8s",
"scheme": "exact",
"network": "solana",
"mimeType": "application/json",
"resource": "https://automotive-calc.x402tookit.com/ev-efficiency",
"description": "EV efficiency in kWh per 100 miles, miles per kWh, Wh per km and MPGe, range from battery size, and cost versus a gas car.",
"outputSchema": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"unit": "kwh_per_100mi",
"gasMpg": 30,
"batteryKwh": 75,
"efficiency": 28,
"pricePerKwh": 0.16,
"gasPricePerGallon": 3.5
}
},
"output": {
"asOf": "2026-10-11T14:38:37.138Z",
"mpge": 120.38,
"source": "computed locally",
"rangeKm": 431.1,
"reasons": [
"MPGe = miles per kWh x 33.705 (EPA: one gallon of gasoline holds the energy of 33.705 kWh).",
"1 mile = 1.609344 km."
],
"summary": "3.571 miles per kWh = 28 kWh per 100 miles = 174 Wh per km = 120.4 MPGe. A 75 kWh battery goes about 267.9 miles (431.1 km). At 0.16 per kWh that is 0.0448 per mile, 538 a year for 12000 miles. The ga…",
"verdict": "COMPUTED",
"whPerKm": 173.98,
"degraded": false,
"kmPerKwh": 5.7477,
"annualKwh": 3360,
"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": [
"real-world range: speed, cold weather, climate control, wheels, load and battery age cut range by 10 to 40%",
"charging losses (about 10% from wall to battery; see /ev-charging)",
"…2 more"
],
"rangeMiles": 267.9,
"costPerMile": 0.0448,
"kwhPer100Km": 17.398,
"milesPerKwh": 3.5714,
"gasAnnualCost": 1400,
"gasCostPerMile": 0.1167,
"kwhPer100Miles": 28,
"annualEnergyCost": 538,
"annualSavingsVsGas": 862,
"kwhPerGallonEquivalent": 33.705,
"breakEvenElectricityPricePerKwh": 0.4167
}
},
"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/ev-efficiency",
"description": "EV efficiency in kWh per 100 miles, miles per kWh, Wh per km and MPGe, range from battery size, and cost versus a gas car.",
"outputSchema": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"unit": "kwh_per_100mi",
"gasMpg": 30,
"batteryKwh": 75,
"efficiency": 28,
"pricePerKwh": 0.16,
"gasPricePerGallon": 3.5
}
},
"output": {
"asOf": "2026-10-11T14:38:37.138Z",
"mpge": 120.38,
"source": "computed locally",
"rangeKm": 431.1,
"reasons": [
"MPGe = miles per kWh x 33.705 (EPA: one gallon of gasoline holds the energy of 33.705 kWh).",
"1 mile = 1.609344 km."
],
"summary": "3.571 miles per kWh = 28 kWh per 100 miles = 174 Wh per km = 120.4 MPGe. A 75 kWh battery goes about 267.9 miles (431.1 km). At 0.16 per kWh that is 0.0448 per mile, 538 a year for 12000 miles. The ga…",
"verdict": "COMPUTED",
"whPerKm": 173.98,
"degraded": false,
"kmPerKwh": 5.7477,
"annualKwh": 3360,
"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": [
"real-world range: speed, cold weather, climate control, wheels, load and battery age cut range by 10 to 40%",
"charging losses (about 10% from wall to battery; see /ev-charging)",
"…2 more"
],
"rangeMiles": 267.9,
"costPerMile": 0.0448,
"kwhPer100Km": 17.398,
"milesPerKwh": 3.5714,
"gasAnnualCost": 1400,
"gasCostPerMile": 0.1167,
"kwhPer100Miles": 28,
"annualEnergyCost": 538,
"annualSavingsVsGas": 862,
"kwhPerGallonEquivalent": 33.705,
"breakEvenElectricityPricePerKwh": 0.4167
}
},
"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/fuel-trip-cost",
"path": "/fuel-trip-cost",
"what": "Trip fuel and cost for legs with different mileage (city, highway), tank range, refuel st…",
"price": "$0.02"
},
{
"url": "https://automotive-calc.x402tookit.com/gear-rpm",
"path": "/gear-rpm",
"what": "Engine RPM at a road speed (or speed at an RPM) from tire size, axle ratio and transmissi…",
"price": "$0.02"
},
{
"url": "https://automotive-calc.x402tookit.com/lease-vs-buy",
"path": "/lease-vs-buy",
"what": "Lease versus buy over the lease term: lease payment from money factor and residual, loan…",
"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": {
"unit": "kwh_per_100mi",
"gasMpg": 30,
"batteryKwh": 75,
"efficiency": 28,
"pricePerKwh": 0.16,
"gasPricePerGallon": 3.5
}
},
"output": {
"type": "json",
"example": {
"asOf": "2026-10-11T14:38:37.138Z",
"mpge": 120.38,
"source": "computed locally",
"rangeKm": 431.1,
"reasons": [
"MPGe = miles per kWh x 33.705 (EPA: one gallon of gasoline holds the energy of 33.705 kWh).",
"1 mile = 1.609344 km."
],
"summary": "3.571 miles per kWh = 28 kWh per 100 miles = 174 Wh per km = 120.4 MPGe. A 75 kWh battery goes about 267.9 miles (431.1 km). At 0.16 per kWh that is 0.0448 per mile, 538 a year for 12000 miles. The ga…",
"verdict": "COMPUTED",
"whPerKm": 173.98,
"degraded": false,
"kmPerKwh": 5.7477,
"annualKwh": 3360,
"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": [
"real-world range: speed, cold weather, climate control, wheels, load and battery age cut range by 10 to 40%",
"charging losses (about 10% from wall to battery; see /ev-charging)",
"…2 more"
],
"rangeMiles": 267.9,
"costPerMile": 0.0448,
"kwhPer100Km": 17.398,
"milesPerKwh": 3.5714,
"gasAnnualCost": 1400,
"gasCostPerMile": 0.1167,
"kwhPer100Miles": 28,
"annualEnergyCost": 538,
"annualSavingsVsGas": 862,
"kwhPerGallonEquivalent": 33.705,
"breakEvenElectricityPricePerKwh": 0.4167
}
}
},
"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": [
"efficiency",
"unit"
],
"properties": {
"unit": {
"type": "string",
"description": "kwh_per_100mi, mi_per_kwh, wh_per_km, kwh_per_100km or mpge"
},
"gasMpg": {
"type": "number",
"description": "A gas car's mpg, to compare running cost"
},
"batteryKwh": {
"type": "number",
"description": "Usable battery in kWh, for range"
},
"efficiency": {
"type": "number",
"description": "The efficiency figure"
},
"annualMiles": {
"type": "number",
"description": "Miles a year, 100 to 200000 (default 12000)"
},
"pricePerKwh": {
"type": "number",
"description": "Electricity price per kWh"
},
"gasPricePerGallon": {
"type": "number",
"description": "Gasoline price per gallon (with gasMpg)"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"properties": {
"asOf": {
"type": [
"null",
"string"
]
},
"mpge": {
"type": [
"null",
"number"
]
},
"source": {
"type": [
"null",
"string"
]
},
"rangeKm": {
"type": [
"null",
"number"
]
},
"reasons": {
"type": [
"array",
"null"
],
"items": {
"type": "string"
}
},
"summary": {
"type": [
"null",
"string"
]
},
"verdict": {
"type": [
"null",
"string"
]
},
"whPerKm": {
"type": [
"null",
"number"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"kmPerKwh": {
"type": [
"null",
"number"
]
},
"annualKwh": {
"type": [
"null",
"number"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"notChecked": {
"type": [
"array",
"null"
],
"items": {
"type": "string"
}
},
"rangeMiles": {
"type": [
"null",
"number"
]
},
"costPerMile": {
"type": [
"null",
"number"
]
},
"kwhPer100Km": {
"type": [
"null",
"number"
]
},
"milesPerKwh": {
"type": [
"null",
"number"
]
},
"gasAnnualCost": {
"type": [
"null",
"number"
]
},
"gasCostPerMile": {
"type": [
"null",
"number"
]
},
"kwhPer100Miles": {
"type": [
"null",
"number"
]
},
"annualEnergyCost": {
"type": [
"null",
"number"
]
},
"annualSavingsVsGas": {
"type": [
"null",
"number"
]
},
"kwhPerGallonEquivalent": {
"type": [
"null",
"number"
]
},
"breakEvenElectricityPricePerKwh": {
"type": [
"null",
"number"
]
}
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-10-20 20:45Z
- Last indexed by Roundhouse
- 2026-10-22 06:50Z
- Last enriched (probe, favicon, geo)
- 2026-10-21 00:15Z
- 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/ev-efficiency, 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.