← The evidence ledger
Evidence row 2201270
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://grades-calc.x402tookit.com/gpa
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 0d6578ccaefbe2863599ae6fb917b558a3b9056e23fdc7dbb5476feb7765210c
- Leaf
- 0xd1a1491051df5874b0a5d71ce91d3f96fc12153c67c9659090d6311323a4e00a
What was observed
{
"endpoints": [
[
"x402",
"https://grades-calc.x402tookit.com/gpa"
]
],
"name": "Grades & Study Calc",
"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": "GPA on the 4.0 scale from letter grades and credits, with optional honors (+0.5) and AP/IB (+1.0) weighting.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"courses": "[{\"grade\":\"A\",\"credits\":3},{\"grade\":\"B+\",\"credits\":4},{\"grade\":\"C\",\"credits\":3}]"
},
"type": "http"
},
"output": {
"example": {
"asOf": "2026-10-12T01:53:41.747Z",
"courses": [
{
"credits": 3,
"grade": "A",
"level": "regular",
"points": 4,
"qualityPoints": 12
},
{
"credits": 4,
"grade": "B+",
"level": "regular",
"points": 3.3,
"qualityPoints": 13.2
}
],
"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.",
"gpa": 3.12,
"gpaToTwoPlaces": 3.12,
"notChecked": [
"your school's own scale (some give A+ 4.3, no plus/minus, or different honors bonuses)",
"repeated-course and pass/fail policies",
"…1 more"
],
"reasons": [
"GPA = total quality points / total credits; each course's quality points = grade points x credits."
],
"source": "computed locally (quality points / credits; standard 4.0 plus/minus scale)",
"summary": "GPA 3.12 on 10 credits (31.2 quality points).",
"totalCredits": 10,
"totalQualityPoints": 31.2,
"unweightedGpa": 3.12,
"verdict": "COMPUTED",
"weighted": false
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"courses": {
"description": "JSON array of up to 60 objects like {\"grade\":\"B+\",\"credits\":4,\"level\":\"ap\"}; level is regular (default), honors or ap",
"type": "string"
},
"weighted": {
"description": "true to add +0.5 for honors and +1.0 for AP/IB courses (only to passing grades; default false)",
"type": "string"
}
},
"required": [
"courses"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"asOf": {
"type": [
"null",
"string"
]
},
"courses": {
"items": {
"properties": {
"credits": {
"type": [
"null",
"number"
]
},
"grade": {
"type": [
"null",
"string"
]
},
"level": {
"type": [
"null",
"string"
]
},
"points": {
"type": [
"null",
"number"
]
},
"qualityPoints": {
"type": [
"null",
"number"
]
}
},
"type": "object"
},
"type": [
"array",
"null"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"gpa": {
"type": [
"null",
"number"
]
},
"gpaToTwoPlaces": {
"type": [
"null",
"number"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"source": {
"type": [
"null",
"string"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"totalCredits": {
"type": [
"null",
"number"
]
},
"totalQualityPoints": {
"type": [
"null",
"number"
]
},
"unweightedGpa": {
"type": [
"null",
"number"
]
},
"verdict": {
"type": [
"null",
"string"
]
},
"weighted": {
"type": [
"boolean",
"null"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-11-02T04:06:51.952Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 1,
"lastCalledAt": "2026-11-02T04:06:51.708Z"
},
"resource": "https://grades-calc.x402tookit.com/gpa",
"serviceName": "Grades & Study Calc",
"tags": [
"gpa",
"grades",
"school",
"college"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "GPA on the 4.0 scale from letter grades and credits, with optional honors (+0.5) and AP/IB (+1.0) weighting."
}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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- Day root
- 0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1
- Chained
- 0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2
- Published
- On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af