Home Energy Calculators
Estimate a monthly electricity bill from kWh with block-tier rates, a fixed monthly charge and a tax or fee percentage.
OtherLiveeip155:8453Exactvia cdp
EnergyElectricityBillRatesCalculator
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.
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact",
"network": "base",
"mimeType": "application/json",
"resource": "https://home-energy-calc.x402tookit.com/bill-estimate",
"description": "Estimate a monthly electricity bill from kWh with block-tier rates, a fixed monthly charge and a tax or fee percentage.",
"outputSchema": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"kwh": 800,
"tiers": "500@0.12; rest@0.15",
"taxPercent": 8,
"fixedCharge": 10
}
},
"output": {
"kwh": 800,
"asOf": "2026-10-11T14:31:35.125Z",
"taxes": 9.2,
"total": 124.2,
"source": "computed locally",
"reasons": [
"Energy charge = kWh in each block x that block's rate, then fixed charge, then tax on the sum.",
"Average price 0.1553 per kWh including fixed charge and tax; marginal (next kWh) price 0.162."
],
"summary": "800 kWh costs 124.2: energy 105 + fixed 10 + 8% tax 9.2.",
"verdict": "COMPUTED",
"degraded": false,
"subtotal": 115,
"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": [
"time-of-use, demand and seasonal rates, riders, fuel-cost adjustments and credits (enter their effect in the tiers if you know it)",
"your utility's actual billing rules, rounding and proration",
"…2 more"
],
"fixedCharge": 10,
"unbilledKwh": 0,
"energyCharge": 105,
"tierBreakdown": [
{
"kwh": 500,
"cost": 60,
"rate": 0.12
},
{
"kwh": 300,
"cost": 45,
"rate": 0.15
}
],
"averagePricePerKwh": 0.15525
}
},
"maxAmountRequired": "20000",
"maxTimeoutSeconds": 300
},
{
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"
},
"payTo": "DUPiupXtuox38dcGoXUKer5mAydCzmaHjrbQ66qeEm8s",
"scheme": "exact",
"network": "solana",
"mimeType": "application/json",
"resource": "https://home-energy-calc.x402tookit.com/bill-estimate",
"description": "Estimate a monthly electricity bill from kWh with block-tier rates, a fixed monthly charge and a tax or fee percentage.",
"outputSchema": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"kwh": 800,
"tiers": "500@0.12; rest@0.15",
"taxPercent": 8,
"fixedCharge": 10
}
},
"output": {
"kwh": 800,
"asOf": "2026-10-11T14:31:35.125Z",
"taxes": 9.2,
"total": 124.2,
"source": "computed locally",
"reasons": [
"Energy charge = kWh in each block x that block's rate, then fixed charge, then tax on the sum.",
"Average price 0.1553 per kWh including fixed charge and tax; marginal (next kWh) price 0.162."
],
"summary": "800 kWh costs 124.2: energy 105 + fixed 10 + 8% tax 9.2.",
"verdict": "COMPUTED",
"degraded": false,
"subtotal": 115,
"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": [
"time-of-use, demand and seasonal rates, riders, fuel-cost adjustments and credits (enter their effect in the tiers if you know it)",
"your utility's actual billing rules, rounding and proration",
"…2 more"
],
"fixedCharge": 10,
"unbilledKwh": 0,
"energyCharge": 105,
"tierBreakdown": [
{
"kwh": 500,
"cost": 60,
"rate": 0.12
},
{
"kwh": 300,
"cost": 45,
"rate": 0.15
}
],
"averagePricePerKwh": 0.15525
}
},
"maxAmountRequired": "20000",
"maxTimeoutSeconds": 300
},
{
"asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact",
"network": "polygon",
"mimeType": "application/json",
"resource": "https://home-energy-calc.x402tookit.com/bill-estimate",
"description": "Estimate a monthly electricity bill from kWh with block-tier rates, a fixed monthly charge and a tax or fee percentage.",
"outputSchema": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"kwh": 800,
"tiers": "500@0.12; rest@0.15",
"taxPercent": 8,
"fixedCharge": 10
}
},
"output": {
"kwh": 800,
"asOf": "2026-10-11T14:31:35.125Z",
"taxes": 9.2,
"total": 124.2,
"source": "computed locally",
"reasons": [
"Energy charge = kWh in each block x that block's rate, then fixed charge, then tax on the sum.",
"Average price 0.1553 per kWh including fixed charge and tax; marginal (next kWh) price 0.162."
],
"summary": "800 kWh costs 124.2: energy 105 + fixed 10 + 8% tax 9.2.",
"verdict": "COMPUTED",
"degraded": false,
"subtotal": 115,
"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": [
"time-of-use, demand and seasonal rates, riders, fuel-cost adjustments and credits (enter their effect in the tiers if you know it)",
"your utility's actual billing rules, rounding and proration",
"…2 more"
],
"fixedCharge": 10,
"unbilledKwh": 0,
"energyCharge": 105,
"tierBreakdown": [
{
"kwh": 500,
"cost": 60,
"rate": 0.12
},
{
"kwh": 300,
"cost": 45,
"rate": 0.15
}
],
"averagePricePerKwh": 0.15525
}
},
"maxAmountRequired": "20000",
"maxTimeoutSeconds": 300
}
],
"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/household-load",
"path": "/household-load",
"what": "Total a list of appliances (watts, hours a day, quantity) into kWh and cost per day, mont…",
"price": "$0.02"
},
{
"url": "https://home-energy-calc.x402tookit.com/ev-charging",
"path": "/ev-charging",
"what": "Electric vehicle charging time, cost and range added from battery size, charge levels, ch…",
"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
[
{
"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": {
"kwh": 800,
"tiers": "500@0.12; rest@0.15",
"taxPercent": 8,
"fixedCharge": 10
}
},
"output": {
"type": "json",
"example": {
"kwh": 800,
"asOf": "2026-10-11T14:31:35.125Z",
"taxes": 9.2,
"total": 124.2,
"source": "computed locally",
"reasons": [
"Energy charge = kWh in each block x that block's rate, then fixed charge, then tax on the sum.",
"Average price 0.1553 per kWh including fixed charge and tax; marginal (next kWh) price 0.162."
],
"summary": "800 kWh costs 124.2: energy 105 + fixed 10 + 8% tax 9.2.",
"verdict": "COMPUTED",
"degraded": false,
"subtotal": 115,
"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": [
"time-of-use, demand and seasonal rates, riders, fuel-cost adjustments and credits (enter their effect in the tiers if you know it)",
"your utility's actual billing rules, rounding and proration",
"…2 more"
],
"fixedCharge": 10,
"unbilledKwh": 0,
"energyCharge": 105,
"tierBreakdown": [
{
"kwh": 500,
"cost": 60,
"rate": 0.12
},
{
"kwh": 300,
"cost": 45,
"rate": 0.15
}
],
"averagePricePerKwh": 0.15525
}
}
},
"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": [
"kwh",
"tiers"
],
"properties": {
"kwh": {
"type": "number",
"description": "Energy used in the month, kWh (0 to 100000)"
},
"tiers": {
"type": "string",
"description": "Rate blocks kWh@rate separated by semicolons, last block 'rest@rate', for example '500@0.12; 500@0.15; rest@0.20'; a single 'rest@0.14' is a flat rate"
},
"taxPercent": {
"type": "number",
"description": "Taxes and percentage fees on the total, 0 to 50 (default 0)"
},
"fixedCharge": {
"type": "number",
"description": "Fixed monthly service charge (default 0)"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"properties": {
"kwh": {
"type": [
"null",
"number"
]
},
"asOf": {
"type": [
"null",
"string"
]
},
"taxes": {
"type": [
"null",
"number"
]
},
"total": {
"type": [
"null",
"number"
]
},
"source": {
"type": [
"null",
"string"
]
},
"reasons": {
"type": [
"array",
"null"
],
"items": {
"type": "string"
}
},
"summary": {
"type": [
"null",
"string"
]
},
"verdict": {
"type": [
"null",
"string"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"subtotal": {
"type": [
"null",
"number"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"notChecked": {
"type": [
"array",
"null"
],
"items": {
"type": "string"
}
},
"fixedCharge": {
"type": [
"null",
"number"
]
},
"unbilledKwh": {
"type": [
"null",
"number"
]
},
"energyCharge": {
"type": [
"null",
"number"
]
},
"tierBreakdown": {
"type": [
"array",
"null"
],
"items": {
"type": "object",
"properties": {
"kwh": {
"type": [
"null",
"number"
]
},
"cost": {
"type": [
"null",
"number"
]
},
"rate": {
"type": [
"null",
"number"
]
}
}
}
},
"averagePricePerKwh": {
"type": [
"null",
"number"
]
}
}
}
}
}
}
}
}
}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/bill-estimate, 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.