Compare two vintages of the same dataset and report where each column drifted
Compare two vintages of the same dataset and report where each column drifted. Covers columns added, removed and reordered, null-rate movement beyond a tolerance, a dominant type that changed, cardinality that moved, and a range that widened - which means values outside what anything downstream was built for, whatever the distribution looks like.
Answers HTTP 429 without x402 payment termsour last check, 2026-10-04
0 of 1checks answered this week
n/amedian answer time
$0.13listed price per call
n/aprice it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://api.zfinia.com/x402/v1/column-profile-drift
| Category | Everything else |
|---|---|
| Provider host | api.zfinia.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-04 | no x402 terms | 429 | 242 ms |
Example input (from the provider)
{
"body": {
"after": "order_id,amount,status,channel\nO-1,10,open,web\nO-2,,open,web\nO-3,30,closed,app\nO-4,99999,disputed,app\n",
"before": "order_id,amount,status,legacy_code\nO-1,10,open,L1\nO-2,20,open,L2\nO-3,30,closed,L3\nO-4,40,closed,L4\n",
"cardinality_tolerance": 0.2,
"null_rate_tolerance": 0.1
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"after": {
"maxLength": 262144,
"type": "string"
},
"before": {
"maxLength": 262144,
"type": "string"
},
"cardinality_tolerance": {
"minimum": 0,
"type": "number"
},
"delimiter": {
"maxLength": 1,
"minLength": 1,
"type": "string"
},
"null_rate_tolerance": {
"maximum": 1,
"minimum": 0,
"type": "number"
}
},
"required": [
"before",
"after"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"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"
}