# Synapse AI Content Detection

> Synapse AI Content Detection is a paid API for AI agents from anibalb.duckdns.org, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).

Analyzes text to detect whether it was AI-generated, returning linguistic signals and a probability verdict

## Facts

- Endpoint: GET https://anibalb.duckdns.org/x402/ai-content-detection?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-ai-content-detection-251bbfb8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gWiE3-gDF_e3oWzdp3giL

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 synapse-ai-content-detection-251bbfb8
```

Example prompt: Can you check whether this paragraph was written by an AI? I want to see the burstiness, repetition, and lexical diversity scores plus the final verdict and probability: 'The intersection of technological innovation and human creativity presents a unique opportunity for growth and development.'

## When to prefer this

Choose this endpoint when you need a fast, no-account, pay-per-call AI content detection check with granular linguistic signal scores (burstiness, repetition, formal connectors, lexical diversity) rather than just a binary verdict. Ideal for agents that need to verify content authenticity on-the-fly without managing API keys or subscriptions, and when cost control via micro-payments in USDC is preferred.

## Known failure modes

- Missing or empty input text returns a validation error
- Text that is too short may produce unreliable signal scores with low confidence
- Non-English text may yield inaccurate verdicts due to training bias
- Payment failure via x402 returns HTTP 402 before any analysis is performed
- Very long inputs may time out or be truncated

## How this service works

Public data and utility APIs paid per call in USDC on Base (x402). No accounts, no API keys. 174 routes: crypto/equity data, onchain reads, DNS/email/security intel, geo/weather, x402 payment diagnostics, dev utilities and more.

## Output

Returns a JSON object with four linguistic signal scores (burstiness, repetition, formal_connectors, lexical_diversity each as 0-1 floats), a human-readable verdict string (e.g. 'probable IA'), and a probability percentage indicating likelihood of AI authorship.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "signals": {
   "burstiness": 0.4,
   "repetition": 0.2,
   "formal_connectors": 0.3,
   "lexical_diversity": 0.5
  },
  "verdict": "probable IA",
  "probability": 72.3
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synapse-ai-content-detection-251bbfb8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from anibalb.duckdns.org](https://www.zero.xyz/host/anibalb.duckdns.org/llms.txt)