Numeric Drift
Compare numeric columns between two datasets on five order statistics: minimum, lower quartile, median, upper quartile and maximum. Quantiles are read off exactly sorted values, so a large or high-precision amount is never collapsed. Values that are not exactly comparable numbers are excluded and the exclusion is reported, because a silently narrowed sample makes every figure below it wrong.
Searchofflineeip155:8453Exactvia cdp
Data qualityDriftDistributionMonitoringDeveloper tooling
Settlements · 30d
219↓ 44%
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.
$25.35
Verified settled volume
256 settlements proven x402 by their on-chain EIP-3009 marker.
$0.150
Listed price
As published in the catalog. Always read the live 402 before paying.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-10-04 08:11Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x25e8245f07d5e4873987293dad666afbe56a9608The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.15USDC≈ $0.15 USD
on Base · exact scheme
Pay 0.15 USDC on Base to 0x25e8…a9608. The signed payment is good for 1 minute.
- Paid to
- 0x25e8…a9608
- USD Coin contract
- 0x8335…02913
- Payment window
- 1 minute
- As published
- 150000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x25e8245f07d5e4873987293dad666afbe56a9608",
"amount": "150000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"after": "latency_ms,amount\n30,100\n60,200\n90,not-a-number\n120,400\n150,500\n",
"before": "latency_ms,amount\n10,100\n20,200\n30,300\n40,400\n50,500\n",
"columns": [
"latency_ms",
"amount"
],
"quantile_tolerance_fraction": 0.1
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"limits": {
"maxRows": 5000,
"maxListed": 200,
"maxColumns": 64,
"maxCsvBytes": 262144,
"maxDatasets": 10,
"maxFindings": 500,
"maxCategories": 1000,
"maxKeyColumns": 4
},
"passed": false,
"stable": false,
"columns": [
{
"after": {
"max": "150",
"min": "30",
"p25": "60",
"p75": "120",
"median": "90"
},
"moved": [
"min",
"p25",
"median"
],
"before": {
"max": "50",
"min": "10",
"p25": "20",
"p75": "40",
"median": "30"
},
"column": "latency_ms",
"null_rate": {
"after": 0,
"before": 0
},
"numeric_count": {
"after": 5,
"before": 5
}
},
{
"after": {
"max": "500",
"min": "100",
"p25": "200",
"p75": "500",
"median": "400"
},
"moved": [
"median",
"p75"
],
"before": {
"max": "500",
"min": "100",
"p25": "200",
"p75": "400",
"median": "300"
},
"column": "amount",
"null_rate": {
"after": 0,
"before": 0
},
"numeric_count": {
"after": 4,
"before": 5
}
}
],
"complete": true,
"findings": [
{
"code": "QUANTILE_DRIFT",
"column": "latency_ms",
"detail": "latency_ms: min moved from 10 to 30, beyond the 10.0% tolerance.",
"statistic": "min"
},
{
"code": "QUANTILE_DRIFT",
"column": "latency_ms",
"detail": "latency_ms: p25 moved from 20 to 60, beyond the 10.0% tolerance.",
"statistic": "p25"
},
{
"code": "QUANTILE_DRIFT",
"column": "latency_ms",
"detail": "latency_ms: median moved from 30 to 90, beyond the 10.0% tolerance.",
"statistic": "median"
}
],
"request_id": "example-request",
"service_id": "numeric_distribution_drift",
"assumptions": [
"Quantiles are read off the exact sorted values, so a large or high-precision amount is never collapsed before the comparison.",
"Values that are not exactly comparable numbers are excluded from every statistic and the exclusion is reported, because a silently narrowed sample makes every figure below it wrong.",
"Tolerance is proportional to the earlier value, so a move from 0 to anything is always a finding."
],
"limitations": [
"Five order statistics per column between the two datasets supplied. This is not a distribution test and carries no significance claim.",
"stable is true only when both datasets were fully read, every named column was comparable, and nothing moved beyond tolerance."
],
"observed_at": "2026-10-02T00:00:00.000Z",
"not_examined": [],
"finding_count": 8,
"after_row_count": 5,
"service_version": "1.0.0",
"before_row_count": 5,
"columns_compared": 2,
"findings_by_code": {
"QUANTILE_DRIFT": 7,
"NON_NUMERIC_VALUES_PRESENT": 1
},
"quantile_tolerance_fraction": 0.1
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"before",
"after",
"columns"
],
"properties": {
"after": {
"type": "string",
"maxLength": 262144
},
"before": {
"type": "string",
"maxLength": 262144
},
"columns": {
"type": "array",
"items": {
"type": "string",
"maxLength": 256
},
"maxItems": 64,
"minItems": 1
},
"delimiter": {
"type": "string",
"maxLength": 1,
"minLength": 1
},
"quantile_tolerance_fraction": {
"type": "number",
"minimum": 0
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-10-04 08:11Z
- Last indexed by Roundhouse
- 2026-10-05 00:20Z
- Last enriched (probe, favicon, geo)
- 2026-10-05 02:46Z
- x402 version
- 2
- Max timeout
- 60s
- Liveness probe
- HTTP 0
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service Numeric Drift and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=Numeric%20Drift' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://api.zfinia.com/x402/v1/numeric-distribution-drift, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Either pay over x402 (mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.