# Toll402 URL Provenance & Human-Origin Scorer

> Toll402 URL Provenance & Human-Origin Scorer is a paid API for AI agents from toll402.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Assesses whether a URL's content is human-authored or AI-generated, returning a calibrated 0-100 human-origin score backed by evidence signals like archive date, domain age, authorship markup, and optional LLM stylometric analysis.

## Facts

- Endpoint: GET https://toll402.dev/v1/provenance
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/toll402-url-provenance-human-origin-scorer-ae30b97a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_IUZuzmb4EyRPY03Ot5l9R

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 toll402-url-provenance-human-origin-scorer-ae30b97a
```

Example prompt: Can you check whether the article at https://example.com/post/my-article was written by a human or AI — run the full stylometric assessment too and give me the human-origin score with all the evidence.

## When to prefer this

Choose this endpoint when you need a structured, evidence-backed provenance assessment of a specific URL — especially when you want multiple corroborating signals (archive age, domain age, authorship markup, curated source tier) rather than just a single AI-detector heuristic. It's ideal for content moderation pipelines, research vetting workflows, or any scenario where you need an auditable chain of evidence rather than a black-box classification. Prefer it over generic AI detectors when provenance metadata (first-capture date, domain age, source tier) matters as much as stylometric signals.

## Known failure modes

- URL is not publicly accessible or returns an error (404, 403, etc.) — ok:false with an error message
- URL is malformed or not a valid URI — validation error on input schema
- LLM stylometric assessment unavailable if server has no LLM key configured (deep=true silently degrades or returns partial results)
- Very new or obscure URLs may have no archive history, reducing evidence quality
- Rate limiting or payment failure via x402 protocol if USDC balance is insufficient

## How this service works

Human or synthetic? Provenance evidence for a URL: archive first-capture date, domain age, authorship markup, curated source tier, AI disclosures and stylometric signals, aggregated into a calibrated 0-100 human-origin score with every piece of evidence. Add deep=true for an LLM stylometric assessment.

## Output

Returns a JSON object with: a 0-100 humanOriginScore (higher = more likely human-authored), a verdict string (e.g. 'likely human', 'likely AI'), a confidence number, the firstArchived date of the URL, an array of evidence signals (each with signal name, value, and direction indicating whether it supports human or AI origin), and a source tier. Response also includes timing (ms) and an ok status flag. With deep=true, an additional LLM-based stylometric assessment is included.

## 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"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "url"
     ],
     "properties": {
      "url": {
       "type": "string",
       "format": "uri",
       "description": "Public URL to assess"
      },
      "deep": {
       "type": "boolean",
       "default": true,
       "description": "Also run an LLM stylometric assessment (only when the server has an LLM key)"
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "ms": {
       "type": "integer"
      },
      "ok": {
       "type": "boolean"
      },
      "tool": {
       "type": "string"
      },
      "result": {
       "type": "object",
       "properties": {
        "source": {
         "type": "object",
         "properties": {
          "tier": {
           "type": "integer"
          }
         }
        },
        "verdict": {
         "type": "string"
        },
        "evidence": {
         "type": "array",
         "items": {
          "type": "object",
          "properties": {
           "value": {
            "type": "string"
           },
           "signal": {
            "type": "string"
           },
           "direction": {
            "type": "string"
           }
          }
         }
        },
        "confidence": {
         "type": "number"
        },
        "firstArchived": {
         "type": "string"
        },
        "humanOriginScore": {
         "type": "integer"
        }
       }
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "source": {
   "tier": 1
  },
  "verdict": "likely_human",
  "evidence": [
   {
    "value": "2003-05-12T00:00:00Z",
    "signal": "wayback_first_capture",
    "direction": "human"
   }
  ],
  "confidence": 0.9,
  "firstArchived": "2003-05-12T00:00:00Z",
  "humanOriginScore": 82
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/toll402-url-provenance-human-origin-scorer-ae30b97a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from toll402.dev](https://www.zero.xyz/host/toll402.dev/llms.txt)