# Claim Grounding Deep Research Lite

> 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.

## Facts

- Endpoint: POST https://claim-grounding.prospectintel.workers.dev/v1/deep_research/lite?utm_source=zero.xyz
- Price: $5/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/claim-grounding-deep-research-lite-8c3d1214
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_W01npzq7lsq0kVPO7O4vi

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability claim-grounding-deep-research-lite-8c3d1214 -d '<json body>'
```

Example prompt: Fact-check this claim for me — 'Global CO2 emissions hit a record high in 2023' — using deep research sources including news and scientific databases, and tell me whether it's supported, contradicted, outdated, or mixed.

## When to prefer this

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 Prefer it over simpler search-based checks when you need a structured verdict with nuance (supported vs mixed vs outdated) rather than a raw search result.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.

## Known failure modes

- 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- outdated verdict if sources exist but are superseded by more recent data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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string"
  },
  "claim": {
   "type": "object",
   "properties": {
    "text": {
     "type": "string"
    }
   }
  },
  "answer": {
   "type": "string",
   "description": "Text whose claims should be researched."
  },
  "claim_ids": {
   "type": "array",
   "items": {
    "type": "string"
   }
  },
  "confirmed": {
   "const": true,
   "description": "Required. Without confirmed: true the call returns 400 and nothing is charged."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "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": []
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/claim-grounding-deep-research-lite-8c3d1214/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from claim-grounding.prospectintel.workers.dev](https://www.zero.xyz/host/claim-grounding.prospectintel.workers.dev/llms.txt)