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The Stall — Fact Check (x402)
x402
The Stall — Fact Check (x402) is a paid API for AI agents from the-stall.intuitek.ai, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-13).
Verifies a factual claim and returns a verdict (true/false/uncertain) with supporting reasoning, paid per-call in USDC via x402.
Price / call$0.1
Success—
StatusUnknown
How this service works
Domain-agnostic x402 capability chassis by IntuiTek¹. 300 AI-callable data services — pay USDC on Base mainnet. No accounts or API keys required.
Output
A verdict on whether the submitted claim is true, false, or uncertain, along with a confidence signal and reasoning that supports the assessment.
Example use cases
Example prompt
“Can you fact-check this claim for me: 'The Eiffel Tower was built in 1889 as a permanent structure' — use the fact-check service and include any relevant historical context about its original purpose?”
Technical details
Endpoint
GEThttps://the-stall.intuitek.ai/cap/fact-checkWhen to prefer
Use this endpoint when an AI agent needs to verify a discrete factual assertion without registering an account or obtaining an API key — particularly useful in automated pipelines where pay-per-call USDC billing (x402) is preferred over subscription models. Best for single, specific claims rather than broad research tasks.
Side effects
- Vague or ambiguous claims may return uncertain verdicts rather than definitive true/false
- Payment failure or insufficient USDC balance blocks the request
- Claims requiring real-time or proprietary data may not be verifiable
- Extremely niche or obscure claims may return low-confidence results
- Missing required 'claim' query parameter returns a validation error
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"claim": "The Earth orbits around the Sun",
"context": "Basic astronomy and planetary motion"
}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
{
"claim": "The Earth orbits around the Sun",
"caveats": "The evidence gathered mainly consists of discussions or opinions rather than directly confirming or denying the claim, which is well-established in the field of astronomy.",
"verdict": "confirmed",
"reasoning": "The scientific consensus is that the Earth orbits around the Sun as part of the heliocentric model of our solar system. No evidence was found that contradicts this fundamental aspect of astronomy, and while some discussions may address nuances in the dynamics of orbital mechanics, they do not undermine the validity of the claim.",
"timestamp": "2026-06-12T05:12:38.038Z",
"confidence": 0.95,
"key_entities": [
"Earth",
"Sun"
],
"sources_queried": 4,
"sources_responded": 2,
"supporting_evidence": [],
"contradicting_evidence": []
}Tags
x402
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