Check whether a source supports, contradicts, or gives insufficient information
Check whether a source supports, contradicts, or gives insufficient information about a claim - a typed verdict with a real probability, not generated text. Try GET /verify/sample.
Answeringour last check, 2026-09-28
1 of 1checks answered this week
964 msmedian answer time
$0.001listed price per call
$0.001price 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://x402.agentindex.world/verify
| Category | Everything else |
|---|---|
| Provider host | x402.agentindex.world |
| 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 |
|---|---|---|---|---|
| 2026-09-28 | valid payment request | 402 | $0.001 | 964 ms |
Example input (from the provider)
{
"body": {
"claim": "The Eiffel Tower is taller than the Statue of Liberty.",
"source": "The Eiffel Tower stands 330 meters tall including antennas, while the Statue of Liberty, including its pedestal, reaches about 93 meters."
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"claim": {
"description": "The factual claim to check.",
"type": "string"
},
"source": {
"description": "The source text to check the claim against.",
"type": "string"
}
},
"required": [
"claim",
"source"
]
},
"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": {
"properties": {
"confidence": {
"type": "number"
},
"probabilities": {
"type": "object"
},
"probability": {
"description": "Probability of the returned verdict.",
"type": "number"
},
"verdict": {
"enum": [
"supported",
"contradicted",
"not_enough_info"
],
"type": "string"
},
"x402_receipt": {
"description": "Billing and provenance receipt for this call.",
"type": "object"
}
},
"required": [
"verdict",
"probability",
"probabilities"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}