← The evidence ledger
Evidence row 2201565
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://ml-metrics.x402tookit.com/calibration
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 879aae3dafd7c0e83542c0f86e11cec5de3777edcda203a5ac07808d712b5fbe
- Leaf
- 0x8a5c1e9ac0bd2a21a6ab7b16f0cc55d6c805ecb2549bd5584c3002995af065ad
What was observed
{
"endpoints": [
[
"x402",
"https://ml-metrics.x402tookit.com/calibration"
]
],
"name": "Machine Learning Metrics",
"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": "Reliability bins, expected and maximum calibration error and Brier score from binary labels and predicted probabilities.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"labels": "0,1,1,1",
"probs": "0.1,0.1,0.9,0.9"
},
"type": "http"
},
"output": {
"example": {
"asOf": "2026-10-21T05:49:43.846Z",
"binCount": 10,
"bins": [
{
"bin": 0,
"count": 0,
"gap": null,
"meanPredicted": null,
"observedRate": null
},
{
"bin": 1,
"count": 2,
"direction": "under-confident",
"gap": 0.4,
"highest": 0.1,
"lowest": 0.1,
"meanPredicted": 0.1,
"observedRate": 0.5
}
],
"brierScore": 0.21,
"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.",
"expectedCalibrationError": 0.25,
"maximumCalibrationError": 0.4,
"notChecked": [
"confidence intervals on bin accuracies",
"sensitivity of ECE to the number of bins",
"…1 more"
],
"reasons": [
"ECE bands (0.05, 0.15) are a rule of thumb; ECE depends on the bin count and is noisy with few samples."
],
"sampleCount": 4,
"source": "computed locally",
"strategy": "uniform",
"summary": "Expected calibration error 0.25, max 0.4, Brier 0.21 over 4 sample(s) in 10 uniform bins.",
"verdict": "POORLY_CALIBRATED"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"bins": {
"description": "Number of bins, 2 to 50, default 10",
"type": "integer"
},
"labels": {
"description": "True binary labels 0/1, comma-separated or JSON array, up to 10000 values",
"type": "string"
},
"probs": {
"description": "Predicted probability of class 1 per sample (0 to 1), same length",
"type": "string"
},
"strategy": {
"description": "uniform (equal-width bins, default) or quantile (equal-count bins)",
"type": "string"
}
},
"required": [
"labels",
"probs"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"asOf": {
"type": [
"null",
"string"
]
},
"binCount": {
"type": [
"null",
"number"
]
},
"bins": {
"items": {
"properties": {
"bin": {
"type": [
"null",
"number"
]
},
"count": {
"type": [
"null",
"number"
]
},
"direction": {
"type": [
"null",
"string"
]
},
"gap": {
"type": [
"null",
"number"
]
},
"highest": {
"type": [
"null",
"number"
]
},
"lowest": {
"type": [
"null",
"number"
]
},
"meanPredicted": {
"type": [
"null",
"number"
]
},
"observedRate": {
"type": [
"null",
"number"
]
}
},
"type": "object"
},
"type": [
"array",
"null"
]
},
"brierScore": {
"type": [
"null",
"number"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"expectedCalibrationError": {
"type": [
"null",
"number"
]
},
"maximumCalibrationError": {
"type": [
"null",
"number"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"sampleCount": {
"type": [
"null",
"number"
]
},
"source": {
"type": [
"null",
"string"
]
},
"strategy": {
"type": [
"null",
"string"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"verdict": {
"type": [
"null",
"string"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-11-01T23:38:44.351Z",
"quality": {
"l30DaysTotalCalls": 1,
"l30DaysUniquePayers": 1,
"lastCalledAt": "2026-11-01T23:38:44.06Z"
},
"resource": "https://ml-metrics.x402tookit.com/calibration",
"serviceName": "Machine Learning Metrics",
"tags": [
"machine-learning",
"calibration",
"ece",
"brier-score"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Reliability bins, expected and maximum calibration error and Brier score from binary labels and predicted probabilities."
}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