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KARP Hallucination Check by SoulDriver
x402
KARP Hallucination Check by SoulDriver is a paid API for AI agents from agents.souldriver.com.au, paid per call via x402, $0.25/call, status unknown (last checked 2026-10-30).
Fact-checks a single claim against the live web using four independent AI models (GPT, Gemini, Grok, Claude) and returns a multi-model verdict with agreement score, mean confidence, and per-model reasoning with citations.
Price / call$0.25
Success—
StatusUnknown
How this service works
Hallucination check: a live fact-check of one claim by four independent AI models (GPT, Gemini, Grok, Claude), each searching the web separately. Returns a summary first: verdict (confirmed, disputed, unverifiable, or contested when the models split), agreement such as 4/4, mean confidence and a one-line headline. Then each model's verdict, reasoning and cited sources. Disagreement is shown, not hidden. 10-45 s.
Output
Returns a JSON object with a summary block containing: overall status (unanimous/split), verdict (confirmed/disputed/unverifiable/contested), a one-line headline, agreement ratio (e.g. 4/4 or 3/4), and mean confidence across models. Also includes an array of per-model verdicts, each with the provider name, individual verdict, confidence score, natural-language reasoning, and cited web sources with URLs and titles.
Example use cases
Verifying AI-generated research facts
“I just got this output from an AI assistant: 'Lithium-ion batteries were first commercially introduced by Sony in 1991.' Can you run it through your four-model fact-checker and tell me if all the models agree it's correct, along with their sources?”
Checking viral news before sharing
“Before I repost this, can you fact-check the claim 'Spain won the 2026 FIFA World Cup' — I want to see if GPT, Gemini, Grok, and Claude all agree, and what their confidence levels are?”
Debunking contested health claims
“I keep seeing people say 'Drinking eight glasses of water a day is a scientifically proven requirement' — can you run that through your multi-model hallucination checker and show me what each AI model found and whether they all agree?”
Technical details
Endpoint
POSThttps://agents.souldriver.com.au/v1/check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need multi-source, multi-model consensus on a factual claim rather than a single AI's judgment. It is ideal when hallucination risk is high, when publishing accuracy matters, or when a disputed claim needs transparent disagreement surfaced rather than hidden. Prefer it over single-model fact-checkers when you want cited web sources and a quantified agreement score. Not suited for opinion-based or subjective statements.
Side effects
- Claim exceeds 500-character limit — validation error returned
- One or more underlying AI providers are unavailable, potentially reducing agreement denominator
- Claim is too vague or ambiguous for models to search effectively, resulting in 'unverifiable' verdict
- Timeout beyond 45s if all four providers are slow to respond
- Payment failure via x402 if USDC balance is insufficient — endpoint returns 402 before processing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| claim | string | One factual claim to check |
Output
Schema · Response
{
"type": "json",
"example": {
"claim": "Spain won the 2026 FIFA World Cup.",
"summary": {
"status": "unanimous",
"verdict": "confirmed",
"headline": "Confirmed: all 4 grounded providers agree.",
"agreement": "4/4",
"mean_confidence": 0.963
},
"verdicts": [
{
"verdict": "confirmed",
"provider": "grok",
"citations": [
{
"url": "https://...",
"title": "..."
}
],
"reasoning": "...",
"confidence": 0.95,
"citation_kind": "cited"
}
]
}
}Tags
x402
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