# agentutility — paid x402 endpoints for autonomous agents

> agentutility — paid x402 endpoints for autonomous agents is a paid API for AI agents from x402.agentutility.ai, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).

## Facts

- Endpoint: POST https://x402.agentutility.ai/x-account-authenticity
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x-account-authenticity-66638e00
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LWJuYyGYj7RzHHna1FS-L

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 x-account-authenticity-66638e00 -d '<json body>'
```

## How this service works

Paid x402 endpoints organized into product clusters. USDC-settled on Base. MCP-callable. ERC-8004 identity registry agentId 47167.

## Request schema (JSON Schema)

```json
{
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "type": "object",
 "properties": {
  "input": {
   "type": "object",
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "type": "string",
     "enum": [
      "POST"
     ]
    },
    "bodyType": {
     "type": "string",
     "enum": [
      "json",
      "form-data",
      "text"
     ]
    },
    "body": {
     "properties": {
      "handle": {
       "type": "string",
       "description": "X/Twitter handle to score, with or without the leading @, e.g. 'elonmusk' or '@elonmusk'. Letters, digits, underscore; max 15 chars."
      },
      "sample_size": {
       "type": "number",
       "description": "How many recent tweets to sample for the AI-text and sentiment checks. Default 20, range 5-50."
      }
     },
     "required": [
      "handle"
     ]
    }
   },
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "handle": {
       "type": "string"
      },
      "authenticity_score": {
       "type": "integer"
      },
      "signals": {
       "type": "object",
       "properties": {
        "ai_text": {
         "type": "object",
         "properties": {
          "probability_ai_generated": {
           "type": "number"
          },
          "verdict": {
           "type": "string"
          }
         }
        },
        "homoglyph_risk": {
         "type": "object",
         "properties": {
          "handle": {
           "type": "object",
           "properties": {
            "risk_level": {
             "type": "string"
            },
            "risk_score": {
             "type": "integer"
            }
           }
          },
          "display_name": {
           "type": "object",
           "properties": {
            "risk_level": {
             "type": "string"
            },
            "risk_score": {
             "type": "integer"
            }
           }
          }
         }
        },
        "sentiment": {
         "type": "object",
         "properties": {
          "overall_sentiment": {
           "type": "string"
          },
          "average_score": {
           "type": "number"
          }
         }
        },
        "profile_flags": {
         "type": "array"
        }
     
… (truncated)
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "handle": "healthyuser",
  "reasons": [
   "Recent tweets read as human-written."
  ],
  "signals": {
   "ai_text": {
    "verdict": "likely_human",
    "probability_ai_generated": 0.12
   },
   "sentiment": {
    "average_score": 0.02,
    "overall_sentiment": "neutral"
   },
   "profile_flags": [],
   "homoglyph_risk": {
    "handle": {
     "risk_level": "none",
     "risk_score": 0
    },
    "display_name": {
     "risk_level": "none",
     "risk_score": 0
    }
   }
  },
  "degraded": false,
  "components": [
   {
    "ms": 320,
    "ok": true,
    "name": "x-username"
   },
   {
    "ms": 410,
    "ok": true,
    "name": "twitter-x-api"
   }
  ],
  "composed_of": [
   "x-username",
   "twitter-x-api",
   "twitter-sentiment",
   "ai-content-detector",
   "homoglyph-check"
  ],
  "authenticity_score": 78
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x-account-authenticity-66638e00/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.agentutility.ai](https://www.zero.xyz/host/x402.agentutility.ai/llms.txt)