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Synapse AI Content Detection
x402
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
Price / call$0.002
Success—
StatusUnknown
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.
Example use cases
Screen student essays for AI authorship
“I got 30 student essay submissions and I'm suspicious some were written by ChatGPT. Can you run this paragraph through AI content detection and tell me the verdict and probability score: 'In conclusion, the multifaceted nature of climate change demands a holistic approach that encompasses both individual and societal responsibilities.'”
Verify editorial content before publishing
“Before we publish this guest blog post, can you check if it's AI-generated? Here's the opening paragraph: 'The evolving landscape of digital marketing requires brands to adopt a more nuanced and sophisticated approach to consumer engagement.' Give me the full signal breakdown.”
Flag AI-written job application
“Can you analyze this cover letter excerpt for signs it was written by an AI and give me a probability score? The text is: 'I am deeply passionate about contributing my skills and expertise to your esteemed organization, as I believe my background aligns seamlessly with your organizational objectives.'”
Technical details
Endpoint
GEThttps://anibalb.duckdns.org/x402/ai-content-detection?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"signals": {
"burstiness": 0.4,
"repetition": 0.2,
"formal_connectors": 0.3,
"lexical_diversity": 0.5
},
"verdict": "probable IA",
"probability": 72.3
}
}Tags
x402
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