Compare old/new field declarations for directional breaking changes
Compare old/new field declarations for directional breaking changes. No semantic-equivalence proof or data migration.
Answers HTTP 429 without x402 payment termsour last check, 2026-10-18
0 of 1checks answered this week
n/amedian answer time
$0.010064listed price per call
n/aprice it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://www.mahastrategies.com/api/v1/verify/datasets/schema-evolution
| Category | Everything else |
|---|---|
| Provider host | www.mahastrategies.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-18 | no x402 terms | 429 | 37 ms |
Example input (from the provider)
{
"body": {
"after": [
{
"name": "x",
"nullable": true,
"required": false,
"type": "number",
"unit": "m"
}
],
"before": [
{
"name": "x",
"nullable": true,
"required": false,
"type": "integer",
"unit": "m"
}
],
"dataClass": "synthetic",
"rejectExtraFields": true
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"additionalProperties": false,
"properties": {
"after": {
"maxItems": 64,
"minItems": 1,
"type": "array"
},
"before": {
"maxItems": 64,
"minItems": 1,
"type": "array"
},
"dataClass": {
"enum": [
"synthetic",
"public"
],
"type": "string"
},
"rejectExtraFields": {
"type": "boolean"
}
},
"required": [
"dataClass",
"before",
"after",
"rejectExtraFields"
],
"type": "object",
"x-max-request-bytes": 262144,
"x-semantic-rules": [
"Unique field names in each before/after declaration."
]
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"additionalProperties": false,
"properties": {
"data": {
"type": "object"
},
"proof": {
"type": "object"
},
"success": {
"const": true,
"type": "boolean"
}
},
"required": [
"success",
"data",
"proof"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}