claim-grounding.prospectintel.workers.dev
Check answer. Splits an AI answer into claims and checks each against Wikipedia, Wikidata and (for current claims) news. Returns per-claim verdict, confidence, quote, source URL and sentence, a source-quoted suggested_correction for wrong claims, and an answer summary with problem_sentences. $1.00 USDC.
Offering
- Provider
- claim-grounding.prospectintel.workers.dev
- Method
- POST
- Offering type
- Api Endpoint
- Transport type
- http
- Category
- Web Search Research
- Delivery
- Not provided
- Pricing model
- Not provided
- x402 version
- 2
Endpoint context
- URL
https://claim-grounding.prospectintel.workers.dev/v1/check_answer- MIME type
- application/json
- First seen
- 2026-10-16T01:52:25.593Z
- Last seen
- Tags
- None supplied
Payment pricing
x402 payment terms are the authoritative price for calling this endpoint.
- Payment option 1
- 1 USDC
Atomic price: 1000000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
{
"scheme": "exact",
"network": "eip155:8453",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "1000000",
"payTo": "0x485FfC037f02dDDc154A454a9cA89C4B1b29e25b"
}
]Observed health
- Status
- Healthy
- Latest latency
- 141 ms
- Average latency
- 217 ms
- HTTP status
- 402
- Last checked
- Reachability
- 100% over 14 checks
Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.
Input schema
{
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"type": {
"const": "http"
},
"method": {
"const": "POST"
},
"bodyType": {
"const": "json"
},
"body": {
"type": "object",
"required": [
"answer"
],
"properties": {
"answer": {
"type": "string",
"minLength": 1,
"description": "The answer text to check."
},
"sources": {
"type": "array",
"maxItems": 10,
"items": {
"type": "object",
"description": "One source: {url} for a public https page we fetch, or {text, title?, url?} for text you already have.",
"properties": {
"url": {
"type": "string",
"format": "uri",
"maxLength": 2048,
"description": "Public https URL. Fetched with a 3.5 s timeout and a 512 KB cap; http, file and other schemes, private / loopback / link-local / metadata addresses, IP-literal hosts, custom ports and URLs with credentials are rejected (HTTP 400, not charged). With text, it is only the citation link."
},
"text": {
"type": "string",
"minLength": 1,
"maxLength": 20000,
"description": "Source text to check the claim against (up to 20,000 characters). When given, no fetch is made."
},
"title": {
"type": "string",
"maxLength": 200,
"description": "Optional title shown in citations."
}
},
"anyOf": [
{
"required": [
"url"
]
},
{
"required": [
"text"
]
}
],
"additionalProperties": false
},
"description": "Optional. Up to 10 sources of your own, used as extra evidence next to the public sources and cited with provider and source_type \"caller\". The response lists what was used in sources_used."
},
"sources_only": {
"type": "boolean",
"default": false,
"description": "Optional. true = judge the claim only against your sources (no public-source lookups). Needs a non-empty sources array."
}
}
}
}
}Output schema
{
"properties": {
"input": {
"properties": {
"body": {
"properties": {
"answer": {
"description": "The answer text to check.",
"minLength": 1,
"type": "string"
},
"sources": {
"description": "Optional. Up to 10 sources of your own, used as extra evidence next to the public sources and cited with provider and source_type \"caller\". The response lists what was used in sources_used.",
"items": {
"additionalProperties": false,
"anyOf": [
{
"required": [
"url"
]
},
{
"required": [
"text"
]
}
],
"description": "One source: {url} for a public https page we fetch, or {text, title?, url?} for text you already have.",
"properties": {
"text": {
"description": "Source text to check the claim against (up to 20,000 characters). When given, no fetch is made.",
"maxLength": 20000,
"minLength": 1,
"type": "string"
},
"title": {
"description": "Optional title shown in citations.",
"maxLength": 200,
"type": "string"
},
"url": {
"description": "Public https URL. Fetched with a 3.5 s timeout and a 512 KB cap; http, file and other schemes, private / loopback / link-local / metadata addresses, IP-literal hosts, custom ports and URLs with credentials are rejected (HTTP 400, not charged). With text, it is only the citation link.",
"format": "uri",
"maxLength": 2048,
"type": "string"
}
},
"type": "object"
},
"maxItems": 10,
"type": "array"
},
"sources_only": {
"default": false,
"description": "Optional. true = judge the claim only against your sources (no public-source lookups). Needs a non-empty sources array.",
"type": "boolean"
}
},
"required": [
"answer"
],
"type": "object"
},
"bodyType": {
"const": "json"
},
"method": {
"const": "POST"
},
"type": {
"const": "http"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"const": "json"
}
},
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}