Deep verify
Deep verify. Checks a claim against Wikipedia, Google News titles, Europe PMC reviews and trials (health and science claims), FRED data (US economic indicators), Wikidata structured facts (dates, quantities, offices held) and SEC EDGAR filings (US public companies: financials, listing status, former names), and flags a contradiction when sources disagree. Async: returns a job_id; poll GET /v1/jobs/{id} (free) for verdict, evidence for and against, citations and receipt. $0.75 USDC.
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://claim-grounding.prospectintel.workers.dev/v1/deep_verify
| Category | Company and compliance |
|---|---|
| Provider host | claim-grounding.prospectintel.workers.dev |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 2 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-18 | valid payment request | 402 | $0.75 | 91 ms |
Example input (from the provider)
{
"body": {
"claim": {
"text": "Paris is the capital of France"
}
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"properties": {
"input": {
"properties": {
"body": {
"properties": {
"answer": {
"type": "string"
},
"claim": {
"anyOf": [
{
"minLength": 1,
"type": "string"
},
{
"properties": {
"text": {
"minLength": 1,
"type": "string"
}
},
"required": [
"text"
],
"type": "object"
}
],
"description": "The claim to check. Object {\"text\": \"...\"} or a plain string."
},
"text": {
"type": "string"
}
},
"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"
}