Sentiment Analysis API POST

Sentiment Analysis is a simple tool for analyzing the sentiment of a text. It returns the sentiment score and the sentiment label.

Try it — live request, no key required

Request

POSTapi.apiverve.com/v1/sentimentanalysis

Verification

Format

No key required to try it. Get a key to use it in your app.

200 OK

{
  "status": "ok",
  "error": null,
  "data": {
    // Sentiment Analysis response payload
  }
}

About the Sentiment Analysis API

Sentiment Analysis works by analyzing the text and comparing it to a large database of sentiment analysis models. It uses advanced algorithms to analyze the sentiment of the text and returns the sentiment score and the sentiment label.

What people use it for

Social Media Monitoring: Use the Sentiment Analysis API to analyze text sentiment for social media monitoring. Use the data to track brand sentiment, monitor customer feedback, and identify trends
Customer Feedback: Analyze customer feedback by using the Sentiment Analysis API to evaluate text sentiment. Use the data to measure customer satisfaction, improve products, and enhance customer experience
Market Research: Conduct market research by using the Sentiment Analysis API to analyze text sentiment. Use the data to study consumer behavior, identify market trends, and make data-driven decisions
Brand Reputation: Monitor brand reputation by using the Sentiment Analysis API to analyze text sentiment. Use the data to assess brand sentiment, manage public relations, and respond to feedback

Ways to call it

One endpoint, many ways in — REST with JSON, XML, YAML and CSV, plus GraphQL and an MCP interface for AI agents.

JSON: Default REST response
XML: Markup format
YAML: Human-readable
CSV: Tabular export
GraphQL: Query language
MCP: For AI agents

View all integrations →

Other ways to use Sentiment Analysis

Same data, same APIVerve account, same credit balance — one key works on all of them.

Give it to an AI agentConnect over MCP and your agent calls it as a native tool — Claude, Cursor, ChatGPT.on VerveKit Google Sheets or ExcelA =VERVE() formula fills a column — no script, no export, recalculates in place.on VerveSheets Ground an agent on itA cited, machine-checkable fact your model can't produce on its own.on VerveContext

Questions.

Common questions about the Sentiment Analysis API.

Read the docs →

What does the Sentiment Analysis API do?

Sentiment Analysis is a simple tool for analyzing the sentiment of a text. It returns the sentiment score and the sentiment label.

How do I authenticate Sentiment Analysis API requests?

Pass your API key in the x-api-key header over HTTPS. One key works across all 300+ APIVerve APIs — there are no per-endpoint credentials.

How much does the Sentiment Analysis API cost?

Each call spends 10 credits from your shared pool. The free tier includes 200 credits every month, and paid plans add more headroom.

How fast is the Sentiment Analysis API?

Response time depends on the endpoint — the p50 through p99 latency for this API is published on this page. Requests are served over HTTPS through a global edge network.

What response formats does the Sentiment Analysis API support?

JSON by default, plus XML and YAML via the format parameter. GraphQL and an MCP interface for AI agents are available across the catalog.

What HTTP method does the Sentiment Analysis API use?

POST over HTTPS, following standard REST conventions with a consistent { status, error, data } response envelope.

Request parameters — POST /v1/sentimentanalysis

Sent as JSON in the request body. Premium parameters are accepted on every plan but only take effect on plans that include them. Anything not listed here is dropped rather than passed through.

Required

Parameter	Type	Example	Description
`text`Required	string	`I absolutely love this product! It exceeded all my expectations.`	The text to analyze the sentiment of length 0-50000

Example request

curl -X POST "https://api.apiverve.com/v1/sentimentanalysis" \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"text":"I'\''m so excited that tomorrow is going to be sunny! Can'\''t wait!"}'

Authentication

Send your key in the x-api-key header. That is the only auth step — no token exchange, and no per-endpoint scope to configure.

Header	When	Value
`x-api-key`Required	Every request	Your API key. Header names are case-insensitive, so `X-API-Key` is the same header.
`Authorization`Alternate	Instead of the above	`Bearer <key>` — for clients that only expose bearer auth. Resolves to the same account and the same billing.
`content-type`Required	POST body	`application/json`

401 is the only auth verdict

A 401 means the key is missing, invalid or expired. A 403 means the key is valid but not permitted here — blocked by a key restriction or an IP allow-list. Running out of credits is a 429.

Response — POST /v1/sentimentanalysis

Every APIVerve endpoint returns the same three top-level keys, so one response handler covers your whole integration: status, error and data. Only data changes shape.

Sample response

{
  "status": "ok",
  "error": null,
  "data": {
    "comparative": 0.25,
    "sentimentText": "positive",
    "sentiment": 3,
    "isPositive": true,
    "isNegative": false,
    "normalizedScore": 0.3
  }
}

Response fields

Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.

Field	Type	Example	Description
`comparative`	number	`0.25`
`sentimentText`	string	`"positive"`
`sentiment`	number	`3`
`isPositive`	boolean	`true`	Whether the sentiment is positive
`isNegative`	boolean	`false`	Whether the sentiment is negative
`normalizedScore`Premium	number	`0.3`	Sentiment score normalized to -1 to 1 range

Response headers

Every response carries your balance, so your own code always knows where it stands without polling anything. All four are exposed to browsers through CORS.

Header	What it carries
`x-api-remaining-credits`	Credits left in the current cycle
`x-api-credits-used`	Credits spent in the current cycle
`x-api-max-credits`	The allowance for the cycle
`x-api-version`	Version of the endpoint that answered

Errors

Read the HTTP status first, then error for the specific reason. The body names the parameter that has to change.

Status	Meaning	What to do
`400`	Input was rejected	Read `error`; it names the parameter that has to change.
`401`	Key missing or invalid	Check the header name and the key value.
`403`	Key valid, but not permitted here	A key restriction or an IP allow-list — never a bad key.
`429`	Rate limited, or out of credits	Read `error` to tell them apart, then back off or top up.

What a call costs — 10 credits per call

Credits are shared across every APIVerve API — one balance, one key, one bill. Failed requests never count against it, so a rejected input costs nothing.

Plan	Per month	Credits	Sentiment Analysis calls	Per 1,000 calls
Free	Free	200	20	Free
Starter	$29.99	200,000	20,000	$1.50
Pro	$99.99	1,000,000	100,000	$1.00
Mega	$299.99	4,000,000	400,000	$0.75

Calls are what the credits buy at this API's rate — spend them here, on any of the other APIs, or across both. Nothing is reserved per endpoint.

Compare all pricing tiers →

Call it from cURL — POST /v1/sentimentanalysis

No SDK to install — this is a plain HTTPS call to /v1/sentimentanalysis with your key in the x-api-key header. Swap in a real key and it runs as-is.

cURL

1
2

curl "https://api.apiverve.com/v1/sentimentanalysis" \
  -H "x-api-key: YOUR_API_KEY"

Resources

GitHubapiverve/sentimentanalysis-apiSource, issues and the examples this page is built from.ReferenceSentiment Analysis API docsEvery parameter, every response field, and the errors.ParametersWhat this call acceptsRequired and optional inputs, with example values.

Also published for

@apiverve/sentimentanalysisnpm apiverve-sentimentanalysisPyPI APIVerve.API.SentimentAnalysisNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from Node.js — POST /v1/sentimentanalysis

Install the Node.js SDK, then call the Sentiment Analysis API with your key. The client wraps the same HTTPS request, so anything it returns is what the endpoint returns.

Install — npm

npm install @apiverve/sentimentanalysis

Node.js

const res = await fetch("https://api.apiverve.com/v1/sentimentanalysis", {
  headers: { "x-api-key": "YOUR_API_KEY" },
});
const { data } = await res.json();
console.log(data);

Resources

npm@apiverve/sentimentanalysisThe published Node.js client, versioned and signed.GitHubapiverve/sentimentanalysis-apiSource, issues and the examples this page is built from.ReferenceSentiment Analysis API docsEvery parameter, every response field, and the errors.ParametersWhat this call acceptsRequired and optional inputs, with example values.

Also published for

apiverve-sentimentanalysisPyPI APIVerve.API.SentimentAnalysisNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from Python — POST /v1/sentimentanalysis

Install the Python SDK, then call the Sentiment Analysis API with your key. The client wraps the same HTTPS request, so anything it returns is what the endpoint returns.

Install — PyPI

pip install apiverve-sentimentanalysis

Python

import requests

res = requests.get(
    "https://api.apiverve.com/v1/sentimentanalysis",
    headers={"x-api-key": "YOUR_API_KEY"},
)
print(res.json()["data"])

Resources

PyPIapiverve-sentimentanalysisThe published Python client, versioned and signed.GitHubapiverve/sentimentanalysis-apiSource, issues and the examples this page is built from.ReferenceSentiment Analysis API docsEvery parameter, every response field, and the errors.ParametersWhat this call acceptsRequired and optional inputs, with example values.

Also published for

@apiverve/sentimentanalysisnpm APIVerve.API.SentimentAnalysisNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from C# / .NET — POST /v1/sentimentanalysis

Install the C# / .NET SDK, then call the Sentiment Analysis API with your key. The client wraps the same HTTPS request, so anything it returns is what the endpoint returns.

Install — NuGet

dotnet add package APIVerve.API.SentimentAnalysis

C# / .NET

using var client = new HttpClient();
client.DefaultRequestHeaders.Add("x-api-key", "YOUR_API_KEY");

var json = await client.GetStringAsync("https://api.apiverve.com/v1/sentimentanalysis");
Console.WriteLine(json);

Resources

NuGetAPIVerve.API.SentimentAnalysisThe published C# / .NET client, versioned and signed.GitHubapiverve/sentimentanalysis-apiSource, issues and the examples this page is built from.ReferenceSentiment Analysis API docsEvery parameter, every response field, and the errors.ParametersWhat this call acceptsRequired and optional inputs, with example values.

Also published for

@apiverve/sentimentanalysisnpm apiverve-sentimentanalysisPyPI

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from Go — POST /v1/sentimentanalysis

No SDK to install — this is a plain HTTPS call to /v1/sentimentanalysis with your key in the x-api-key header. Swap in a real key and it runs as-is.

req, _ := http.NewRequest("GET", "https://api.apiverve.com/v1/sentimentanalysis", nil)
req.Header.Set("x-api-key", "YOUR_API_KEY")

res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))

Resources

Also published for

@apiverve/sentimentanalysisnpm apiverve-sentimentanalysisPyPI APIVerve.API.SentimentAnalysisNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from PHP — POST /v1/sentimentanalysis

No SDK to install — this is a plain HTTPS call to /v1/sentimentanalysis with your key in the x-api-key header. Swap in a real key and it runs as-is.

PHP

$ch = curl_init("https://api.apiverve.com/v1/sentimentanalysis");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-api-key: YOUR_API_KEY"]);

$response = curl_exec($ch);
echo $response;

Resources

Also published for

@apiverve/sentimentanalysisnpm apiverve-sentimentanalysisPyPI APIVerve.API.SentimentAnalysisNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

Call it from Ruby — POST /v1/sentimentanalysis

No SDK to install — this is a plain HTTPS call to /v1/sentimentanalysis with your key in the x-api-key header. Swap in a real key and it runs as-is.

Ruby

require "net/http"

uri = URI("https://api.apiverve.com/v1/sentimentanalysis")
req = Net::HTTP::Get.new(uri)
req["x-api-key"] = "YOUR_API_KEY"

res = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |h| h.request(req) }
puts res.body

Resources

Also published for

@apiverve/sentimentanalysisnpm apiverve-sentimentanalysisPyPI APIVerve.API.SentimentAnalysisNuGet

Only the languages APIVerve ships a client for are listed — the rest call the endpoint directly over HTTPS.

All articles →

Summarize Text with AI: A Practical GuideUse AI to summarize articles, documents, and user content. Tutorial with code for content platforms, research tools, and dashboards.Read

Why Your Sentiment Analysis Is WrongSentiment analysis is powerful but often misused. Here's how to use sentiment data effectively.Read

Sentiment Analysis: Read Customer Feedback at ScaleProcess thousands of reviews, support tickets, and social mentions automatically. Find the signal in the noise.Read

Sentiment Analysis API POST

Try it — live request, no key required

About the Sentiment Analysis API

What people use it for

Ways to call it

Other ways to use Sentiment Analysis

Questions.

Request parameters — POST /v1/sentimentanalysis

Required

Authentication

Response — POST /v1/sentimentanalysis

Response fields

Response headers

Errors

What a call costs — 10 credits per call

Call it from cURL — POST /v1/sentimentanalysis

Resources

Also published for

Call it from Node.js — POST /v1/sentimentanalysis

Resources

Also published for

Call it from Python — POST /v1/sentimentanalysis

Resources

Also published for

Call it from C# / .NET — POST /v1/sentimentanalysis

Resources

Also published for

Call it from Go — POST /v1/sentimentanalysis

Resources

Also published for

Call it from PHP — POST /v1/sentimentanalysis

Resources

Also published for

Call it from Ruby — POST /v1/sentimentanalysis

Resources

Also published for

Zero-code embed — one snippet, no backend

Changelog — Sentiment Analysis API

AI/Computer Vision

Related articles

Ready to build with Sentiment Analysis? Start with 200 free credits — one key unlocks all 300+ APIs.

Explore the catalog