# MCX Ventures Adversarial Verification – Basic (Skeptic Critic)

> MCX Ventures Adversarial Verification – Basic (Skeptic Critic) is a paid API for AI agents from api.mcx-ventures.com, paid per call via x402, $0.5/call, status unknown (last checked 2026-10-29).

Adversarially critiques and verifies a submitted text payload using a basic skeptic-critic approach, returning a verification assessment.

## Facts

- Endpoint: POST https://api.mcx-ventures.com/v2/verify/basic?utm_source=zero.xyz
- Price: $0.5/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mcx-ventures-adversarial-verification-basic-skeptic-critic-5238f8a9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-66jpTQscpNgsnJu3nIun

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 mcx-ventures-adversarial-verification-basic-skeptic-critic-5238f8a9 -d '<json body>'
```

Example prompt: Run an adversarial skeptic-critic check on this text and tell me if it holds up: 'Our product has been proven to reduce costs by 40% in all enterprise environments.'

## When to prefer this

Choose this endpoint when you need a quick, cost-effective adversarial review of a text claim, argument, or content snippet and want a skeptic-critic perspective without deeper multi-check analysis. Prefer the basic tier for lightweight verification tasks or when cost is a concern; upgrade to higher tiers for forensic-level or multi-dimensional verification.

## Known failure modes

- Missing or empty payload field returns validation error
- Payment not provided or insufficient USDC results in 402 Payment Required
- Malformed request body (wrong bodyType or method) returns 400 Bad Request
- Content too long or unsupported format may result in processing error
- Service unavailability returns 5xx error

## How this service works

Adversarial verification, basic tier — Skeptic critic

## Output

A structured adversarial critique of the submitted content, highlighting weaknesses, dubious claims, logical flaws, or unsupported assertions as assessed by the basic skeptic-critic tier.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "required": [
      "payload"
     ],
     "properties": {
      "payload": {
       "type": "string",
       "description": "Content to verify. Required on the paid POST."
      }
     },
     "additionalProperties": false
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mcx-ventures-adversarial-verification-basic-skeptic-critic-5238f8a9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.mcx-ventures.com](https://www.zero.xyz/host/api.mcx-ventures.com/llms.txt)