← The evidence ledger
Evidence row 117132
Observed , by baseline/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://modell.halowerk.com/v1/drift-check
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 09e4c5da3a1bbb643fd8791998fd876296b59778eb54b8882344d1e17aa8144a
- Leaf
- 0x706c9778d8116c7f7cd058d15ace55fb564984a3f90c3ce6eddd742fc81d17aa
What was observed
{
"endpoints": [
[
"x402",
"https://modell.halowerk.com/v1/drift-check"
]
],
"name": "modell.halowerk.com/v1/drift-check",
"owner_address": "0x2880edfff13100677bf97a3cbdf3bc34771c4e5e",
"raw": {
"accepts": [
{
"amount": "3000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"asset": "USDC",
"assetTransferMethod": "eip3009",
"eip712Domain": {
"chainId": 8453,
"name": "USD Coin",
"verifyingContract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"version": "2"
},
"name": "USD Coin",
"network_name": "Base Mainnet",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:8453",
"payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
"scheme": "exact"
}
],
"description": "Compares two submitted sample sets feature by feature and returns deterministic drift metrics. Continuous features are binned on the combined value range and receive PSI, Jensen-Shannon divergence and a Kolmogorov-Smirnov statistic; categorical features receive PSI and Jensen-Shannon divergence over exact category labels. The response names every feature, its sample counts, the metric values, the threshold used, and the reason a feature was flagged.",
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"bins": 5,
"current_samples": {
"risk_score": [
0.14,
0.19,
0.23,
0.32,
0.4,
0.44,
0.48,
0.52
],
"segment": [
"retail",
"smb",
"smb",
"enterprise",
"enterprise",
"enterprise"
]
},
"feature_types": {
"risk_score": "continuous",
"segment": "categorical"
},
"reference_samples": {
"risk_score": [
0.12,
0.18,
0.2,
0.21,
0.25,
0.28,
0.31,
0.34
],
"segment": [
"retail",
"retail",
"smb",
"smb",
"enterprise",
"retail"
]
},
"threshold": 0.2
},
"bodyType": "json",
"method": "POST",
"type": "http"
},
"output": {
"example": {
"drift_detected": true,
"features": [
{
"drift": true,
"feature": "risk_score",
"jensen_shannon": 0.189,
"ks": 0.5,
"psi": 0.612345,
"type": "continuous"
}
],
"summary": {
"features_checked": 2,
"flagged_features": 1,
"threshold": 0.2
}
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"bins": {
"default": 10,
"description": "Number of equal-width bins for continuous features.",
"maximum": 50,
"minimum": 2,
"type": "integer"
},
"current_samples": {
"additionalProperties": {
"items": {
"type": [
"number",
"string",
"boolean"
]
},
"maxItems": 10000,
"minItems": 2,
"type": "array"
},
"description": "Current samples keyed by the same feature names as reference_samples.",
"maxProperties": 50,
"minProperties": 1,
"type": "object"
},
"feature_types": {
"additionalProperties": {
"enum": [
"continuous",
"categorical"
],
"type": "string"
},
"description": "Optional explicit feature types keyed by feature name.",
"maxProperties": 50,
"type": "object"
},
"reference_samples": {
"additionalProperties": {
"items": {
"type": [
"number",
"string",
"boolean"
]
},
"maxItems": 10000,
"minItems": 2,
"type": "array"
},
"description": "Baseline samples keyed by feature name. Each value is an array of finite numbers for continuous features or scalar category labels for categorical features.",
"maxProperties": 50,
"minProperties": 1,
"type": "object"
},
"threshold": {
"default": 0.2,
"description": "Drift threshold applied to PSI for the final feature flag.",
"maximum": 1,
"minimum": 0.01,
"type": "number"
}
},
"required": [
"reference_samples",
"current_samples"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-10-21T21:16:12.899Z",
"quality": {
"l30DaysTotalCalls": 3,
"l30DaysUniquePayers": 3,
"lastCalledAt": "2026-10-21T21:16:12.478Z"
},
"resource": "https://modell.halowerk.com/v1/drift-check",
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Compares two submitted sample sets feature by feature and returns deterministic drift metrics. Continuous features are binned on the combined value range and receive PSI, Jensen-Shannon divergence and a Kolmogorov-Smirnov statistic; categorical features receive PSI and Jensen-Shannon divergence over exact category labels. The response names every feature, its sample counts, the metric values, the threshold used, and the reason a feature was flagged."
}What the leaf hashes
{"body":"09e4c5da3a1bbb643fd8791998fd876296b59778eb54b8882344d1e17aa8144a","id":117132,"kind":"listing","method":"baseline/1","observed_us":1793025610650794,"prev":null,"subject":"x402_bazaar:https://modell.halowerk.com/v1/drift-check","subject_kind":"source_record"}Proof
Its day has not closed yet. A day closes ten minutes after midnight UTC; the proof appears here then.