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Claim Grounding Deep Research Lite
x402
Claim Grounding Deep Research Lite is a paid API for AI agents from claim-grounding.prospectintel.workers.dev, paid per call via x402, $5/call, status unknown (last checked 2026-10-17).
Verifies factual claims in text against Wikipedia, Wikidata, Google News, Europe PMC, FRED, and SEC EDGAR, returning a structured verdict for each claim.
Price / call$5
Success—
StatusUnknown
How this service works
Pay-per-call claim checks for AI agents. Sources: Wikipedia, Wikidata, Google News, Europe PMC (PubMed), FRED and SEC EDGAR. USDC on Base via x402 (Coinbase CDP facilitator). No API key. Every checked claim returns verdict: supported | contradicted | outdated | mixed | insufficient_evidence, plus status_detail and legacy_verdict (pre-1.2.0 value: supported | contradicted | not_found | conflict).
Output
Returns a job ID and poll URL for async retrieval, along with a receipt listing each extracted claim with its claim_id, grounding requirement flag, creation timestamp, and price. Once complete, each claim receives a verdict (supported | contradicted | outdated | mixed | insufficient_evidence), a status_detail explanation, and a legacy_verdict for backward compatibility.
Example use cases
Hallucination check for AI-generated report
“I just got a research summary from another AI — can you verify the key claims in it? Specifically check: 'The Federal Reserve raised rates 7 times in 2022' and 'US inflation peaked at 9.1% in June 2022'. Tell me if each is supported, contradicted, or outdated.”
Medical claim verification for patient FAQ
“Our chatbot wrote this answer about statins: 'Statins reduce cardiovascular mortality by approximately 25% in high-risk patients.' Can you ground that claim against PubMed and scientific sources and tell me if it's supported or contradicted?”
Financial fact-check before publishing
“Before we publish this newsletter, please verify this claim: 'US GDP grew at an annualized rate of 2.4% in Q2 2023.' Check it against FRED and SEC EDGAR sources and return a verdict with supporting detail.”
Technical details
Endpoint
POSThttps://claim-grounding.prospectintel.workers.dev/v1/deep_research/lite?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need authoritative, multi-source fact verification for AI-generated content — especially when claims span scientific literature (PubMed), economic data (FRED), corporate disclosures (SEC EDGAR), encyclopedic knowledge (Wikipedia/Wikidata), or recent news (Google News). Prefer it over simpler search-based checks when you need a structured verdict with nuance (supported vs mixed vs outdated) rather than a raw search result. It is particularly valuable for detecting AI hallucinations in high-stakes domains like medicine, finance, and journalism.
Side effects
- 400 error if `confirmed: true` is not included in the request body — nothing is charged
- Claim returns insufficient_evidence if no authoritative source addresses the topic
- outdated verdict if sources exist but are superseded by more recent data
- Job may remain in queued/processing state requiring polling of the job status endpoint
- Rate limits or payment failures via x402/USDC on Base may block the call
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | |
| claim | object | |
| answer | string | Text whose claims should be researched. |
| claim_ids | array | |
| confirmed | — | Required. Without confirmed: true the call returns 400 and nothing is charged. |
Output
Schema · Response
{
"type": "json",
"example": {
"mode": "fast",
"poll": "GET /v1/jobs/job_8c1d2e3f4a5b6c7d (free)",
"claims": [],
"job_id": "job_8c1d2e3f4a5b6c7d",
"status": "queued",
"receipt": {
"claims": [
{
"text": "Paris is the capital of France",
"claim_id": "clm_3f9a1c2b4d5e6f70",
"grounding_required": true
}
],
"job_id": "job_8c1d2e3f4a5b6c7d",
"created_at": "2026-10-10T12:00:00.000Z",
"priced_usd": 5
},
"next_actions": []
}
}Tags
x402
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