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BaseBuilder Sentiment API
x402
BaseBuilder Sentiment API is a paid API for AI agents from bb-sentiment.vercel.app, paid per call via x402, $0.142876/call, status unknown (last checked 2026-09-15).
Analyzes and classifies the sentiment of input text, returning sentiment scores and labels
Price / call$0.142876
Success—
StatusUnknown
How this service works
BaseBuilder Sentiment API hub - 14 paid endpoints
Output
A sentiment classification (positive, negative, or neutral), a numerical sentiment score, and a confidence level indicating how strongly the text aligns with the detected sentiment category.
Example use cases
Customer feedback analysis for support teams
“I need to sort through our recent support tickets and flag which ones contain negative sentiment so our team can prioritize urgent complaints. Can you run sentiment analysis on these messages and give me a confidence score for each one?”
Social media brand monitoring dashboard
“We're launching a new product tomorrow and I want to track real-time sentiment on social mentions about our brand. Can you analyze these tweets and posts to show me whether people are reacting positively or negatively, with scores so I can measure sentiment shift?”
Product review quality scoring system
“We have hundreds of product reviews coming in daily and need to automatically classify them as positive, negative, or neutral. Can you analyze these reviews and give me sentiment scores so we can highlight the most critical negative feedback to our product team?”
Technical details
Endpoint
POSThttps://bb-sentiment.vercel.app/api/sentimentWhen to prefer
Choose this endpoint when you need a paid, production-grade sentiment classification for arbitrary text, particularly when working in an x402-compatible payment flow on Base. Suitable for processing reviews, social posts, or customer feedback where a numeric confidence score alongside a categorical label is needed.
Side effects
- Empty or missing text input returns a 400 error
- Text exceeding maximum length limit may be rejected
- Payment of 0.142876 USDC not provided returns a 402 error
- Unsupported language or encoding may produce inaccurate results
- Ambiguous or very short text may yield low confidence scores
Tags
x402
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