← The evidence ledger
Evidence row 2201179
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://time-series-calc.x402tookit.com/change-points
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 8f06f5d8a0923a8f3894ad811ede45a896f2e9a32bed0433dff4e5ccea527619
- Leaf
- 0xd065970bdd323cca0d90fc4f6d5951a57741ccf14962354c56f59750545d7839
What was observed
{
"endpoints": [
[
"x402",
"https://time-series-calc.x402tookit.com/change-points"
]
],
"name": "Time Series Calculators",
"owner_address": "0xb531320805c5bed1d46aeadcf4f008fdf172dbda",
"raw": {
"accepts": [
{
"amount": "30000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:8453",
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact"
},
{
"amount": "30000",
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM",
"transactionVersions": [
0
]
},
"maxTimeoutSeconds": 300,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "DUPiupXtuox38dcGoXUKer5mAydCzmaHjrbQ66qeEm8s",
"scheme": "exact"
},
{
"amount": "30000",
"asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:137",
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact"
},
{
"amount": "30000",
"asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:42161",
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact"
}
],
"description": "Find level shifts in a series with two-sided CUSUM alarms and a mean-shift binary segmentation, positions 1-based.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"method": "binseg",
"values": "1,1,1,1,1,5,5,5,5,5"
},
"type": "http"
},
"output": {
"example": {
"asOf": "2026-10-21T06:18:22.158Z",
"binarySegmentation": {
"acceptThreshold": 0,
"changePoints": [
{
"newLevelStartsAtPosition": 6,
"sseReduction": 40
}
],
"noiseSigma": 0,
"segments": [
{
"from": 1,
"mean": 1,
"to": 5
},
{
"from": 6,
"mean": 5,
"to": 10
}
]
},
"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.",
"method": "binseg",
"n": 10,
"notChecked": [
"changes in variance or slope (only mean shifts are searched)",
"a formal significance test or false-alarm rate",
"…1 more"
],
"reasons": [
"Binary segmentation: repeatedly split where the sum of squared errors drops most; a split is kept if the drop exceeds 2 x noiseSigma^2 x ln(n), with noiseSigma from the median absolute successive diff…"
],
"source": "computed locally (Page 1954 tabular CUSUM; greedy binary segmentation, Scott and Knott 1974)",
"summary": "1 change signal found in 10 values.",
"verdict": "CHANGE_DETECTED"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"h": {
"description": "CUSUM alarm threshold in sigma units (default 5)",
"type": "number"
},
"k": {
"description": "CUSUM slack in sigma units (default 0.5, tuned for a 1-sigma shift)",
"type": "number"
},
"maxChanges": {
"description": "Most change points binseg may return, 1 to 20 (default 3)",
"type": "integer"
},
"method": {
"description": "both, cusum or binseg (default both)",
"type": "string"
},
"minSegment": {
"description": "Smallest segment length for binseg in observations (default 2)",
"type": "integer"
},
"sigma": {
"description": "CUSUM in-control standard deviation, same unit (default: sd of the first quarter; required if that is 0)",
"type": "number"
},
"target": {
"description": "CUSUM in-control mean in the data's unit (default: mean of the first quarter of the series)",
"type": "number"
},
"values": {
"description": "Comma-separated numbers in time order, oldest first (6 to 500), any one unit",
"type": "string"
}
},
"required": [
"values"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"asOf": {
"type": [
"null",
"string"
]
},
"binarySegmentation": {
"properties": {
"acceptThreshold": {
"type": [
"null",
"number"
]
},
"changePoints": {
"items": {
"properties": {
"newLevelStartsAtPosition": {
"type": [
"null",
"number"
]
},
"sseReduction": {
"type": [
"null",
"number"
]
}
},
"type": "object"
},
"type": [
"array",
"null"
]
},
"noiseSigma": {
"type": [
"null",
"number"
]
},
"segments": {
"items": {
"properties": {
"from": {
"type": [
"null",
"number"
]
},
"mean": {
"type": [
"null",
"number"
]
},
"to": {
"type": [
"null",
"number"
]
}
},
"type": "object"
},
"type": [
"array",
"null"
]
}
},
"type": [
"null",
"object"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"method": {
"type": [
"null",
"string"
]
},
"n": {
"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"
]
},
"verdict": {
"type": [
"null",
"string"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-11-02T04:09:40.782Z",
"quality": {
"l30DaysTotalCalls": 1,
"l30DaysUniquePayers": 1,
"lastCalledAt": "2026-11-02T04:09:40.614Z"
},
"resource": "https://time-series-calc.x402tookit.com/change-points",
"serviceName": "Time Series Calculators",
"tags": [
"change-point",
"cusum",
"segmentation",
"time-series"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Find level shifts in a series with two-sided CUSUM alarms and a mean-shift binary segmentation, positions 1-based."
}What the leaf hashes
{"body":"8f06f5d8a0923a8f3894ad811ede45a896f2e9a32bed0433dff4e5ccea527619","id":2201179,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646801197261,"prev":null,"subject":"x402_bazaar:https://time-series-calc.x402tookit.com/change-points","subject_kind":"source_record"}Proof
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