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Second Opinion — Live Web Verification
x402
Second Opinion — Live Web Verification is a paid API for AI agents from secondopinionx402.com, paid per call via x402, $0.2/call, status unknown (last checked 2026-09-14).
Sends a claim to an independent adversarial agent that actively researches the web to attempt to refute it, then 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 cited web sources used in the adversarial research, confidence signals, and reasoning from the independent skeptical agent.
Example use cases
Fact-checking a viral news claim
“I saw an article claiming that 'global EV sales surpassed 20 million units in 2023' — can you fact-check that with live web research and give me a verdict with sources?”
Verifying a competitor's marketing assertion
“Our competitor's website says they have '99.99% uptime guaranteed for the past five years.' Can you run an adversarial web research check on that claim and return a structured verdict with citations?”
Validating a scientific or medical claim
“Someone told me that 'vitamin D supplementation reduces COVID-19 mortality by 60%.' Can you have an independent adversarial agent research that claim on the web and tell me if it holds up, with sources?”
Technical details
Endpoint
POSThttps://secondopinionx402.com/v1/verifyWhen to prefer
Choose this endpoint when you need an adversarial, citation-backed fact-check grounded in live web research — not just logical reasoning. It is superior to the 'quick' sibling endpoint when you need real-world evidence and citations rather than pure logical analysis. Prefer this over the 'panel' endpoint when you want a single, focused adversarial verdict rather than three distinct lens-based attacks. Ideal for journalism, due diligence, misinformation detection, or any scenario where current web evidence matters.
Side effects
- Claim is too vague or ambiguous for the agent to research effectively
- Live web research returns insufficient or conflicting sources, resulting in an inconclusive verdict
- Payment of $0.20 USDC not settled via x402 protocol, causing authentication failure
- Request body is malformed or missing the required claim input, returning a 400-level error
- Web sources found are outdated or unreliable, reducing verdict quality
- Rate limiting or timeout if the web research phase exceeds allowable duration
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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