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Second Opinion Claim Verifier
x402
Second Opinion Claim Verifier is a paid API for AI agents from second-opinion-production.up.railway.app, paid per call via x402, $0.2/call, status unknown (last checked 2026-09-15).
Submits a claim to an adversarial AI agent that attempts to refute it via live web research and returns a structured verdict with citations
Price / call$0.2
Success—
StatusUnknown
How this service works
Second Opinion: an independent adversarial agent attempts to refute your claim (live web research) and returns a structured verdict with citations.
Output
A structured verdict object indicating whether the claim was refuted or supported, along with citations from live web research and a reasoned adversarial analysis
Example use cases
Example prompt
“Can you run a second opinion check on this claim: 'The Great Wall of China is visible from space with the naked eye' — I want an adversarial agent to try to refute it with live web research and give me a structured verdict with citations.”
Technical details
Endpoint
POSThttps://second-opinion-production.up.railway.app/v1/verifyWhen to prefer
Use this endpoint when you need independent adversarial verification of a specific factual claim backed by live web citations, especially when you want to stress-test an assertion rather than simply search for supporting evidence. Prefer this over generic search when you need a structured verdict with a deliberate attempt to find contradicting evidence.
Side effects
- Claim is too vague to research — returns ambiguous or inconclusive verdict
- Web research yields no relevant sources — citations may be sparse
- Rate limiting or upstream LLM failure — returns 5xx error
- Malformed request body missing required fields — returns 400 validation error
- Payment not processed or x402 payment header missing/invalid — returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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