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x402 Demo API – Sentiment Analysis
x402
x402 Demo API – Sentiment Analysis is a paid API for AI agents from x402-demo-api-theta.vercel.app, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).
Analyzes the sentiment of a given text, returning a sentiment classification (e.g. positive, negative, neutral) and confidence score, paid via x402 protocol on Base mainnet.
Price / call$0.05
Success—
StatusUnknown
How this service works
Paid API with real data: AI/LLM, crypto prices, web search, translation, trending topics, sentiment analysis, aggregator, and more. All endpoints use x402 protocol on Base mainnet.
Output
Returns a sentiment classification label (positive, negative, or neutral) and a confidence score indicating how strongly the text aligns with that sentiment.
Example use cases
Example prompt
“Can you analyze the sentiment of this customer review and tell me if it's positive, negative, or neutral along with a confidence score: "The product arrived quickly but the packaging was damaged and customer support was unresponsive."”
Technical details
Endpoint
POSThttps://x402-demo-api-theta.vercel.app/api/sentimentWhen to prefer
Choose this endpoint when you need a quick, pay-per-use sentiment classification with no subscription required, especially in an x402-enabled agent workflow on Base mainnet. Good for one-off or low-volume sentiment checks on arbitrary text without committing to a full NLP platform.
Side effects
- Missing or empty text input returns a 400 error
- Payment not processed via x402 on Base mainnet returns a 402 Payment Required
- Text too long or malformed request body returns a 422 error
- Service downtime on Vercel returns a 503
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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