← The evidence ledger
Evidence row 2201948
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://electrical-calc.x402tookit.com/voltage-drop
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 98dd8d4c87d7c4740bc5a32c82a3aad6baac91ed291ea7f3a52354ec3039b0d8
- Leaf
- 0xbea33a28ba7d9d3b3309243024f459e10241f3d6643cc48cc757f3a36a5d1f35
What was observed
{
"endpoints": [
[
"x402",
"https://electrical-calc.x402tookit.com/voltage-drop"
]
],
"name": "Electrical Calculators",
"owner_address": "0xb531320805c5bed1d46aeadcf4f008fdf172dbda",
"raw": {
"accepts": [
{
"amount": "20000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:8453",
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact"
},
{
"amount": "20000",
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM",
"transactionVersions": [
0
]
},
"maxTimeoutSeconds": 300,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "DUPiupXtuox38dcGoXUKer5mAydCzmaHjrbQ66qeEm8s",
"scheme": "exact"
},
{
"amount": "20000",
"asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:137",
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact"
},
{
"amount": "20000",
"asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:42161",
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact"
}
],
"description": "Voltage drop of a copper or aluminium conductor, single or three phase, by mm2 or AWG, length, current and temperature.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"currentA": 20,
"lengthM": 50,
"material": "copper",
"phase": "single",
"sizeMm2": 10,
"supplyVoltageV": 230
},
"type": "http"
},
"output": {
"example": {
"areaMm2": 10,
"asOf": "2026-10-21T06:22:29.492Z",
"awgDiameterMm": null,
"conductor": "10 mm2",
"conductorLossW": 68.96,
"currentA": 20,
"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.",
"lengthOneWayM": 50,
"limitPct": 3,
"material": "copper",
"maxLengthForLimitM": 100.058,
"notChecked": [
"conductor ampacity or insulation rating (no NEC or IEC ampacity tables are included: consult the electrical code)",
"skin effect, conduit and bunching, harmonics",
"…1 more"
],
"phase": "single",
"powerFactor": 1,
"reactanceOhmPerKm": 0,
"reasons": [
"Resistance 1.724 ohm/km: rho(20 C) = 1.724e-8 x (1 + 0.00393 x (T - 20)) = 1.724e-8 ohm m over 10 mm2.",
"Single phase counts the there-and-back path: drop = 2 I L (R cos phi + X sin phi).",
"…2 more"
],
"resistanceOhmPerKm": 1.724,
"resistiveDropV": 3.448,
"resistivityOhmM": 1.724e-8,
"source": "computed locally (V = k I L R', k = 2 single phase or sqrt(3) three phase; R' = rho(T)/A)",
"summary": "10 mm2 copper, 20 A over 50 m (single phase) at 20 C drops 3.448 V (1.499% of 230 V).",
"supplyVoltageV": 230,
"temperatureC": 20,
"verdict": "WITHIN_LIMIT",
"voltageDropPct": 1.49913,
"voltageDropV": 3.448
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"awg": {
"description": "American wire gauge such as 12 or 4/0 (send this or sizeMm2)",
"type": "string"
},
"currentA": {
"description": "Load current in amperes (RMS)",
"type": "number"
},
"lengthM": {
"description": "One-way cable length in metres (source to load)",
"type": "number"
},
"limitPct": {
"description": "Drop limit in percent for the maximum length (default 3, a common guideline not a code rule)",
"type": "number"
},
"material": {
"description": "copper or aluminium",
"type": "string"
},
"phase": {
"description": "single (default; there-and-back path) or three (balanced)",
"type": "string"
},
"powerFactor": {
"description": "Load power factor 0 to 1 (default 1)",
"type": "number"
},
"reactanceOhmPerKm": {
"description": "Conductor reactance in ohm per km (default 0, resistance only)",
"type": "number"
},
"sizeMm2": {
"description": "Conductor cross-section in mm2 (send this or awg)",
"type": "number"
},
"supplyVoltageV": {
"description": "Line voltage in volts, to get percent drop (single: line-to-neutral or line-to-line supply as used)",
"type": "number"
},
"temperatureC": {
"description": "Conductor temperature in degrees C (default 20)",
"type": "number"
}
},
"required": [
"material",
"currentA",
"lengthM"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"areaMm2": {
"type": [
"null",
"number"
]
},
"asOf": {
"type": [
"null",
"string"
]
},
"awgDiameterMm": {},
"conductor": {
"type": [
"null",
"string"
]
},
"conductorLossW": {
"type": [
"null",
"number"
]
},
"currentA": {
"type": [
"null",
"number"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"lengthOneWayM": {
"type": [
"null",
"number"
]
},
"limitPct": {
"type": [
"null",
"number"
]
},
"material": {
"type": [
"null",
"string"
]
},
"maxLengthForLimitM": {
"type": [
"null",
"number"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"phase": {
"type": [
"null",
"string"
]
},
"powerFactor": {
"type": [
"null",
"number"
]
},
"reactanceOhmPerKm": {
"type": [
"null",
"number"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"resistanceOhmPerKm": {
"type": [
"null",
"number"
]
},
"resistiveDropV": {
"type": [
"null",
"number"
]
},
"resistivityOhmM": {
"type": [
"null",
"number"
]
},
"source": {
"type": [
"null",
"string"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"supplyVoltageV": {
"type": [
"null",
"number"
]
},
"temperatureC": {
"type": [
"null",
"number"
]
},
"verdict": {
"type": [
"null",
"string"
]
},
"voltageDropPct": {
"type": [
"null",
"number"
]
},
"voltageDropV": {
"type": [
"null",
"number"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-11-01T22:51:24.791Z",
"quality": {
"l30DaysTotalCalls": 1,
"l30DaysUniquePayers": 1,
"lastCalledAt": "2026-11-01T22:51:24.593Z"
},
"resource": "https://electrical-calc.x402tookit.com/voltage-drop",
"serviceName": "Electrical Calculators",
"tags": [
"voltage-drop",
"wire",
"electrical",
"three-phase"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Voltage drop of a copper or aluminium conductor, single or three phase, by mm2 or AWG, length, current and temperature."
}What the leaf hashes
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Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of (444186 rows).
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- 0xcbfaf790331071a9b3499a4db6f9d951fe5d04baefda2c66846b52b023ab8ae5
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- 0x252cce55f1a3d5391c16f82d7f62494429a5f69b03486d4cfcfb7b2c96d6c884
- Day root
- 0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1
- Chained
- 0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2
- Published
- On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af