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klymax402 Fact Checker API
x402
klymax402 Fact Checker API is a paid API for AI agents from klymax402.com, paid per call via x402, $0.012/call, status unknown (last checked 2026-09-14).
Verifies a factual claim against multiple sources and returns a fact-check result with supporting evidence
Price / call$0.012
Success—
StatusUnknown
How this service works
One MCP endpoint gives your AI agent access to 100 APIs -- crypto, DeFi, web, AI, finance and utilities. No API keys, USDC on Base from $0.003/call.
Output
Returns a fact-check verdict indicating whether the claim is true, false, or unverified, along with a list of supporting or contradicting sources (up to the requested maximum), potentially including source URLs, credibility signals, and a confidence assessment.
Example use cases
Verifying viral social media claim
“I saw someone post that 'The Great Wall of China is visible from space' — can you fact-check that claim and show me up to 8 sources?”
Research accuracy check
“Before I publish my report, can you verify whether 'Humans share 98.7% of their DNA with chimpanzees' is accurate, and give me sources to back it up?”
News headline validation
“Can you check whether the claim 'Electric vehicles produce more CO2 than gasoline cars over their lifetime' is true or false, with up to 10 sources?”
Technical details
Endpoint
GEThttps://klymax402.com/api/fact-checker/api/checkWhen to prefer
Choose this endpoint when an AI agent needs to programmatically verify a specific factual claim with cited sources, especially in research, journalism, or content moderation workflows. It is particularly useful when you need a structured fact-check response rather than a raw web search, and when paying per-call without managing API keys is preferable. Use this over general web search when you specifically need a verdict (true/false/unverified) rather than raw search results.
Side effects
- Claim is too vague or ambiguous to verify — endpoint may return low confidence or no verdict
- No reliable sources found for niche or obscure claims — returns empty source list
- Payment failure via x402 protocol — 402 response if USDC payment not completed
- Rate limiting if too many requests are made in a short period
- max_sources exceeds 10 — likely clamped or returns an error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| claim | string | The factual claim to verify (e.g., 'The Eiffel Tower is 330 meters tall') |
| max_sources | number | Maximum number of sources to return (default: 5, max: 10) |
Tags
x402
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