Check supplied JSON against a bounded Draft 2020-12 schema, declared timestamp f
Check supplied JSON against a bounded Draft 2020-12 schema, declared timestamp freshness and optional claim evidence. Return separate pass/fail/review findings. Evidence assessment is advisory and uses supplied excerpts only; no external fact verification, source authentication or URL retrieval.
Answeringour last check, 2026-10-21
1 of 1checks answered this week
868 msmedian answer time
$0.05listed price per call
$0.05price 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.mekler.ai/v1/data/responses/check-response-contract
| Category | Everything else |
|---|---|
| Provider host | api.mekler.ai |
| Networks | eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 0 from 0 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-21 | valid payment request | 402 | $0.05 | 868 ms |
Example input (from the provider)
{
"body": {
"freshness": {
"max_age_seconds": 300,
"pointer": "/updated_at",
"reference_time": "2026-10-21T12:01:00Z"
},
"request_id": "response-check-example-001",
"response": {
"updated_at": "2026-10-21T12:00:00Z",
"value": 12
},
"schema": {
"additionalProperties": false,
"properties": {
"updated_at": {
"format": "date-time",
"type": "string"
},
"value": {
"minimum": 0,
"type": "integer"
}
},
"required": [
"value",
"updated_at"
],
"type": "object"
}
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"freshness": {
"additionalProperties": false,
"properties": {
"max_age_seconds": {
"maximum": 31536000,
"minimum": 0,
"type": "integer"
},
"pointer": {
"maxLength": 256,
"type": "string"
},
"reference_time": {
"type": "string"
}
},
"required": [
"pointer",
"reference_time",
"max_age_seconds"
],
"type": "object"
},
"request_id": {
"pattern": "^[A-Za-z0-9_-]{16,64}$",
"type": "string"
},
"response": {},
"schema": {
"oneOf": [
{
"type": "boolean"
},
{
"type": "object"
}
]
},
"semantic": {
"items": {
"additionalProperties": false,
"properties": {
"evidence": {
"maxLength": 3000,
"minLength": 1,
"type": "string"
},
"pointer": {
"maxLength": 256,
"type": "string"
}
},
"required": [
"pointer",
"evidence"
],
"type": "object"
},
"maxItems": 4,
"minItems": 1,
"type": "array"
}
},
"required": [
"request_id",
"response"
],
"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": {
"additionalProperties": false,
"properties": {
"freshness": {
"properties": {
"status": {
"enum": [
"pass",
"fail",
"not_requested"
],
"type": "string"
}
},
"required": [
"status"
],
"type": "object"
},
"limitations": {
"items": {
"type": "string"
},
"type": "array"
},
"observed_at": {
"type": "string"
},
"schema": {
"properties": {
"status": {
"enum": [
"pass",
"fail",
"not_requested"
],
"type": "string"
}
},
"required": [
"status"
],
"type": "object"
},
"semantic": {
"additionalProperties": false,
"properties": {
"claims": {
"items": {
"additionalProperties": false,
"properties": {
"evidence_quote": {
"maxLength": 300,
"type": "string"
},
"pointer": {
"type": "string"
},
"verdict": {
"enum": [
"supported",
"contradicted",
"uncertain"
],
"type": "string"
}
},
"required": [
"pointer",
"verdict",
"evidence_quote"
],
"type": "object"
},
"maxItems": 4,
"type": "array"
},
"method": {
"type": [
"string",
"null"
]
},
"status": {
"enum": [
"pass",
"fail",
"review",
"not_requested"
],
"type": "string"
}
},
"required": [
"status",
"method",
"claims"
],
"type": "object"
},
"status": {
"enum": [
"ok"
],
"type": "string"
},
"verdict": {
"enum": [
"pass",
"fail",
"review"
],
"type": "string"
}
},
"required": [
"status",
"verdict",
"schema",
"freshness",
"semantic",