Developer API

HumanizerPro Developer API

Integrate our powerful AI content tools directly into your applications. Transform AI text, detect AI content, verify facts, and check plagiarism with simple REST API calls.

Powerful API Endpoints

Access our complete suite of AI content tools through simple REST API calls

Base URL

https://humanizerpro.ai
POST
/api/v1/humanize
Transform AI-generated text into natural, human-like content. Available model types: Basic, Standard, Advanced.
POST
/api/v1/detect-ai
Detect AI-generated content with high accuracy
POST
/api/v1/fact-checker
Verify facts and claims in your content
POST
/api/v1/plagiarism-checker
Check for plagiarism and content originality

/api/v1/humanize

Content-Type: application/json
x-api-key: "API_KEY_HERE"
{
  "text": "AI generated content here...",
  "modelType": "advanced"
}
{
  "humanized_text": "Natural human-like text...",
  "confidence_score": 0.92,
  "words_processed": 150
}

Why Choose HumanizerPro API?

Natural Human-Like Rewriting – Turn AI-generated content into clear, natural, and engaging text that feels like it was written by a real person.
All-in-One Content Services – Get fact checking, AI detection, and plagiarism scanning all in one place to keep your content accurate, original, and trustworthy.
Bypass AI Detectors Easily – Confidently avoid detection from popular AI detectors like GPTZero, Turnitin, and Originality.ai using our advanced technology.
Developer-Friendly API – Simple REST API with clear documentation for easy integration into your apps and workflows.
Fast, Scalable, and Secure – Process large amounts of content quickly while keeping your data private. We do not store your content and work in real time.

Use Cases

AI Text Editors – Add human-like rewriting, AI detection, and plagiarism checks to improve your writing app.
EdTech Platforms – Help students and teachers detect AI-generated text, verify facts, and fix robotic tones.
SEO Agencies – Humanize AI content, check for plagiarism, and verify facts before publishing.
Enterprise Workflows – Speed up rewriting, fact-checking, and AI detection tasks across your content teams.

API Pricing Plans

Choose the perfect plan for your API usage.

Save 40%

Api Starter

$37/month
100,000words / month
Billed monthly
$0.370 per 1K words

Api Professional

$79/month
250,000words / month
Billed monthly
$0.316 per 1K words
MOST POPULAR

Api Business

$149/month
500,000words / month
Billed monthly
$0.298 per 1K words

Api Enterprise

$279/month
1Mwords / month
Billed monthly
$0.279 per 1K words

Api Scale

$499/month
2Mwords / month
Billed monthly
$0.249 per 1K words

Api Ultra

$1100/month
5Mwords / month
Billed monthly
$0.220 per 1K words

Custom Plan

Enterprise volume pricing

API Access

Generate and manage your API keys for programmatic access

Loading API settings...

API Features & Benefits

Lightning Fast

Average response time under 2 seconds for most requests

Enterprise Security

Enterprise-grade security and privacy for all API operations.

99.9% Uptime

Reliable infrastructure with global CDN

Global Access

Available worldwide with regional data centers

24/7 Support

Dedicated developer support and documentation

Detailed Docs

Comprehensive guides and code examples

Frequently Asked Questions

Can I use one API key for everything — Humanizer, AI Detector, and Plagiarism Checker?

Yes! One API key gives you access to all our endpoints: the Humanizer API, AI Detector API, Plagiarism Checker API, and Fact-Checker API. Need a better rate for large projects? We offer special discounts — Use code API50 to get 50% on all plans. Please Contact us if you need assistance.

Does the HumanizerPro API work in different languages?

It does. Our AI Humanizer API supports over 30 languages, including English, Spanish, French, German, and Portuguese. You don’t even have to select the language — we detect it automatically.

How accurate is your AI Detector and rewriting tool?

Our AI Detector API is trained on a variety of writing styles for reliable results. The Humanizer API makes AI text sound natural and human, which can lower AI detection scores. We also include a confidence score so you know exactly how strong the result is.

What makes HumanizerPro’s API different from other rewriting services?

Many rewriting tools only aim to pass AI detection tests. We go further — our AI Humanizer API creates content that’s natural, readable, and ready to publish. Plus, we bundle in AI plagiarism checking, fact verification, and multilingual support so you get a full content toolkit.

Is my data safe when I use your API?

Yes. We don’t store your text or use it for AI training. Every request is processed instantly and then deleted. Whether you’re using the Humanizer API, AI Detector API, or Plagiarism Checker API, your data stays private and secure.

Ready to Get Started?

Join thousands of developers already using our API to power their applications