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Alexey D
Alexey D

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How to Add Sentiment Analysis to Any App in 5 Minutes (Free API)

#api #nlp #python #webdev

Most text analysis solutions fall into one of two problems:

  • Too expensive — OpenAI API costs money for every call
  • Too complex — Hosting your own Hugging Face model requires infra, GPU, maintenance

I built TextAI Pro — a lightweight REST API that does the job without the overhead.

What it does

Two endpoints:

POST /analyze

  • Sentiment: positive / negative / neutral
  • Confidence score (0–1)
  • Top keywords
  • Word count

POST /summarize

  • Auto-summary of any text
  • Returns original length vs summary length

Quick start

Python 

import requests

url = "https://textai-pro.p.rapidapi.com/analyze"
headers = {
    "X-RapidAPI-Key": "YOUR_KEY",
    "Content-Type": "application/json"
}
payload = {"text": "This product is absolutely amazing, I love it!"}

r = requests.post(url, json=payload, headers=headers)
print(r.json())
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Response:

{
  "sentiment": "positive",
  "confidence": 0.92,
  "keywords": ["product", "amazing", "love"],
  "word_count": 8
}
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JavaScript 

const response = await fetch("https://textai-pro.p.rapidapi.com/analyze", {
  method: "POST",
  headers: {
    "X-RapidAPI-Key": "YOUR_KEY",
    "Content-Type": "application/json"
  },
  body: JSON.stringify({ text: "Great customer service, highly recommend!" })
});
const data = await response.json();
console.log(data);
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Use cases

  • Review monitoring — analyze customer feedback automatically
  • Content moderation — flag negative or toxic content
  • CRM enrichment — tag support tickets by sentiment before routing
  • Chatbot routing — detect frustrated users and escalate
  • News monitoring — track sentiment around keywords or brands

Pricing

Plan Price Rate limit
BASIC Free 50 req/hr
PRO $9.99/mo 1,000 req/hr
ULTRA $29.99/mo 10,000 req/hr

Try it

TextAI Pro on RapidAPI

Free tier, no credit card required. Sign up to RapidAPI (free) and subscribe to BASIC to start.

Built this for a side project where I needed bulk sentiment analysis on customer reviews. OpenAI was too expensive for 50k+ records per day. This runs on dedicated infra and costs a fraction.

Feedback welcome — especially on what other endpoints would be useful.

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