← The evidence ledger
Evidence row 2202236
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://aviation-calc.x402tookit.com/pressure-altitude
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- c227be1e5489b3a8acdf809e1cbc9eac0db4b2ba4c53ef42b398a37787514216
- Leaf
- 0xc1aef17245257fa76c95c72b934fec48a84c30fb43f21c306a2c12afcb26635a
What was observed
{
"endpoints": [
[
"x402",
"https://aviation-calc.x402tookit.com/pressure-altitude"
]
],
"name": "Aviation 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": "Pressure altitude from field elevation and altimeter setting (inHg or hPa), exact ISA result and the 1000 ft per inHg rule.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"altimeter": 29.42,
"elevationFt": 5000,
"unit": "inhg"
},
"type": "http"
},
"output": {
"example": {
"altimeterHpa": 996.28,
"altimeterInHg": 29.42,
"asOf": "2026-10-11T14:44:08.837Z",
"degraded": false,
"differenceFromElevationFt": 450.7,
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"elevationFt": 5000,
"notChecked": [
"temperature: pressure altitude ignores it (see /density-altitude)",
"instrument error, local pressure changes since the setting was issued, and mountain-wave or frontal pressure effects",
"…2 more"
],
"pressureAltitudeFt": 5450.7,
"pressureAltitudeRuleOfThumbFt": 5500,
"reasons": [
"Pressure altitude is the altitude in the standard atmosphere that has the station's pressure; set 29.92 inHg (1013.25 hPa) and the altimeter reads it.",
"Station pressure comes from the altimeter setting on a standard lapse; then pressure altitude = ISA altitude at that pressure."
],
"source": "computed locally",
"stationPressureHpa": 828.95,
"stationPressureInHg": 24.479,
"summary": "At 5000 ft with an altimeter setting of 29.42 inHg (996.3 hPa) the pressure altitude is 5451 ft (the 1000 ft per inHg rule gives 5500 ft).",
"verdict": "COMPUTED"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"altimeter": {
"description": "Altimeter setting (QNH): inHg like 29.92 or hPa like 1013",
"type": "number"
},
"elevationFt": {
"description": "Field or aircraft elevation in feet, -1500 to 30000",
"type": "number"
},
"unit": {
"description": "inhg (default) or hpa",
"type": "string"
}
},
"required": [
"elevationFt",
"altimeter"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"altimeterHpa": {
"type": [
"null",
"number"
]
},
"altimeterInHg": {
"type": [
"null",
"number"
]
},
"asOf": {
"type": [
"null",
"string"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"differenceFromElevationFt": {
"type": [
"null",
"number"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"elevationFt": {
"type": [
"null",
"number"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"pressureAltitudeFt": {
"type": [
"null",
"number"
]
},
"pressureAltitudeRuleOfThumbFt": {
"type": [
"null",
"number"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"source": {
"type": [
"null",
"string"
]
},
"stationPressureHpa": {
"type": [
"null",
"number"
]
},
"stationPressureInHg": {
"type": [
"null",
"number"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"verdict": {
"type": [
"null",
"string"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-11-01T22:37:43.199Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-11-01T22:37:43.024Z"
},
"resource": "https://aviation-calc.x402tookit.com/pressure-altitude",
"serviceName": "Aviation Calculators",
"tags": [
"aviation",
"pressure-altitude",
"altimeter",
"e6b",
"calculator"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Pressure altitude from field elevation and altimeter setting (inHg or hPa), exact ISA result and the 1000 ft per inHg rule."
}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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- 0x252cce55f1a3d5391c16f82d7f62494429a5f69b03486d4cfcfb7b2c96d6c884
- Day root
- 0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1
- Chained
- 0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2
- Published
- On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af