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fastapi.online Emotion Detection
x402
fastapi.online Emotion Detection is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Detects emotions expressed in a given text string using a self-hosted AI model
Price / call$0.001
Success—
StatusUnknown
How this service works
Chat, embeddings, OCR, speech-to-text, image editing, image understanding (captioning/Q&A), text-to-speech, translation, writing tools, classification tools, developer tools, local utilities, format/checksum validators, encoding & crypto utilities, date/time calculators, geo/coordinate math, math & finance calculators, novelty tools, and business/social writing generators — 179 endpoints in all, across multiple specialized self-hosted models. Pay per call with crypto — no signup — or get an API key.
Output
Returns the dominant emotion detected in the input text, likely including an emotion label (e.g. anger, joy, sadness, fear, surprise, disgust) and potentially a confidence score. The response is structured JSON from the self-hosted inference model.
Example use cases
Customer support ticket triage
“Analyze this support message and tell me what emotion the customer is expressing: 'I've been waiting three weeks for my package and nobody is answering my calls. I'm so frustrated I could scream.'”
Social media post emotion tagging
“What emotion does this tweet convey? 'Just got the promotion I've been working toward for two years — I'm on top of the world right now!'”
Mental health app mood check-in
“Detect the emotion in this journal entry: 'I don't really feel like doing anything today. Everything just feels heavy and pointless.'”
Technical details
Endpoint
POSThttps://api.fastapi.online/emotion-detectWhen to prefer
Choose this endpoint when you need lightweight, pay-per-call emotion detection without a subscription or signup, especially in crypto-native or agent-driven pipelines using x402 payment protocol. Ideal for low-volume or bursty workloads where you pay $0.001 USDC per call rather than maintaining an API key subscription. Prefer over large LLM-based sentiment analysis when cost efficiency and speed matter more than nuanced reasoning.
Side effects
- Empty or missing text field returns a 422 validation error
- Text exceeding 8000 characters is rejected
- Model inference timeout for unusually complex or long inputs
- Payment not included or insufficient results in a 402 Payment Required response
- Ambiguous or emotionless text may return low-confidence or neutral output
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string |
Tags
x402
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