Do I need an API key?

No! isEven API requires no API key at all. Just call the URL with any positive integer.

Yes, it is silly, but it works and returns actual parity results.

isEven API - Free Parity Check No API Key

TL;DR

What it does: Check if any positive integer is even or odd. Returns a boolean plus a random silly ad.

Quick start: https://api.isevenapi.xyz/api/iseven/6

No API key needed - just call the URL

Overview

Free parity check API. Returns whether a number is even or odd, with a random advertisement. Silly but fun. No API key needed.

Live Example

Here's the exact URL to call and the real response you'll get:

The URL to call:

https://api.isevenapi.xyz/api/iseven/6

Try This URL Now →

The actual response you get:

{
  "ad": "Drink Sprunk cola! The essence of life.",
  "iseven": true
}

What does this data mean?

The response has two fields — iseven tells you if the number is even (true/false), and ad is a random silly advertisement.

iseven: Boolean — true if the number is even, false if it's odd
ad: String — A random silly advertisement (e.g., "Drink Sprunk cola! The essence of life.")

How to use this API

JavaScript Example

const num = 6;
fetch(`https://api.isevenapi.xyz/api/iseven/${num}`)
  .then(res => res.json())
  .then(data => {
    console.log(`${num} is ${data.iseven ? 'even' : 'odd'}`);
    console.log(`Ad: ${data.ad}`);
  });

Python Example

import requests

num = 6
response = requests.get(f"https://api.isevenapi.xyz/api/iseven/{num}")
data = response.json()

print(f"{num} is {'even' if data['iseven'] else 'odd'}")
print(f"Ad: {data['ad']}")

Frequently Asked Questions

Do I need an API key?: No! isEven API requires no API key at all. Just call the URL with any positive integer.
What numbers can I check?: Any positive integer.
How do I check if a number is odd?: A number is odd when iseven returns false. The API only tells you "is this even?" — if the answer is false, it's odd.
Is this a joke?: Yes, it's intentionally silly — the response includes a random ad. But it works correctly! It returns actual parity results for real numbers.
Can I use this commercially?: Yes, this API is free for both personal and commercial use. Check the official documentation for any specific restrictions.
Is there a rate limit?: None documented.
How do I parse the JSON response?: In JavaScript: data.iseven or data.ad. In Python: data['iseven'] or data['ad'].

API Details

Base URL: https://api.isevenapi.xyz/api/iseven/
Documentation: https://isevenapi.xyz/
Category: Entertainment
Authentication: None required
Rate Limit: None documented
Geographic Coverage: Global