# Second Opinion Quick Verify

> Second Opinion Quick Verify is a paid API for AI agents from secondopinionx402.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).

Performs a fast, reasoning-only logical consistency check on a claim without web research, returning a verdict or 'inconclusive' if live data is needed.

## Facts

- Endpoint: POST https://secondopinionx402.com/v1/verify/quick
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/second-opinion-quick-verify-ba56a6e4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mKlzaG0-O0WQR4HESFjhE

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability second-opinion-quick-verify-ba56a6e4 -d '<json body>'
```

Example prompt: Can you do a quick second opinion check on this claim using pure reasoning — no web search: 'A diet high in saturated fat lowers LDL cholesterol levels in all adults'?

## When to prefer this

Use this endpoint when you need a fast, low-cost ($0.03) logical consistency check on a claim and don't need web research — ideal for screening assertions before deeper investigation, validating argument structure, or getting an independent reasoning check on established-knowledge claims. Prefer this over full fact-checking services when speed and cost matter and the claim doesn't depend on recent events.

## Known failure modes

- Missing or empty claim body returns a 400 validation error
- Claims requiring live data or recent events return an 'inconclusive' result rather than a verdict
- Ambiguous or multi-part claims may produce low-confidence or partial verdicts
- Network timeout if the reasoning model takes too long
- Payment failure via x402 protocol returns 402 Payment Required

## How this service works

Second Opinion quick: an independent reasoning-only check (no web research) of your claim's logic and consistency with established knowledge. Honest 'inconclusive' when the claim needs live research.

## Output

A structured response containing a verdict (supported, contradicted, or inconclusive), a reasoning explanation of why the claim is or isn't logically consistent with established knowledge, and an 'inconclusive' signal when the claim requires live research or real-time data to evaluate properly.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "bodyType",
    "body",
    "method"
   ],
   "properties": {
    "body": {
     "properties": {}
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/second-opinion-quick-verify-ba56a6e4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from secondopinionx402.com](https://www.zero.xyz/host/secondopinionx402.com/llms.txt)