Arespass

arespass · Company

Company No Auth Free & Open API

Analyzes a password and calculates its entropy.

Authentication

No authentication requiredFree to use with no key needed.

Sample Requests

GET Metadata about this API: version number, release date and available languages. Metadata requests are NOT billed.

Metadata about this API: version number, release date and available languages. Metadata requests are NOT billed.

https://api.apis.guru/v2/specs/arespass.net/1.0/about?outputFormat=example

Hover any highlighted part to learn what it does

curl -X GET "https://api.apis.guru/v2/specs/arespass.net/1.0/about?outputFormat=example"

import requests
params = {
    "outputFormat": "example"
}
response = requests.get(
    "https://api.apis.guru/v2/specs/arespass.net/1.0/about",
    params=params,
)
print(response.json())

const url = new URL('https://api.apis.guru/v2/specs/arespass.net/1.0/about');
url.searchParams.set('outputFormat', 'example');

const response = await fetch(url); 
const data = await response.json();
console.log(data);

package main

import (
	"fmt"
	"io"
	"net/http"
	"net/url"
)

func main() {
	baseURL, _ := url.Parse("https://api.apis.guru/v2/specs/arespass.net/1.0/about")
	q := baseURL.Query()
	q.Set("outputFormat", "example")
	baseURL.RawQuery = q.Encode()
	targetURL := baseURL.String()
	req, _ := http.NewRequest("GET", targetURL, nil)

	client := &http.Client{}
	resp, _ := client.Do(req)
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	fmt.Println(string(body))
}

require "net/http"
require "json"

uri = URI("https://api.apis.guru/v2/specs/arespass.net/1.0/about")
uri.query = URI.encode_www_form({
  "outputFormat" => "example"
})

http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"

req = Net::HTTP::Get.new(uri)

res = http.request(req)
puts JSON.parse(res.body)

<?php
$url = "https://api.apis.guru/v2/specs/arespass.net/1.0/about?" . http_build_query([
    "outputFormat" => "example"
]);
$opts = ["http" => [
    "method" => "GET",
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));

GET The entropy calculator - alias ec -, analyzes a password and calculates its entropy. Entropy calculator requests are billed.

The entropy calculator - alias ec -, analyzes a password and calculates its entropy. Entropy calculator requests are billed.

https://api.apis.guru/v2/specs/arespass.net/1.0/ec?reqId=example&penalty=1&password=example&outputFormat=example

Hover any highlighted part to learn what it does

curl -X GET "https://api.apis.guru/v2/specs/arespass.net/1.0/ec?reqId=example&penalty=1&password=example&outputFormat=example"

import requests
params = {
    "reqId": "example",
    "penalty": "1",
    "password": "example",
    "outputFormat": "example"
}
response = requests.get(
    "https://api.apis.guru/v2/specs/arespass.net/1.0/ec",
    params=params,
)
print(response.json())

const url = new URL('https://api.apis.guru/v2/specs/arespass.net/1.0/ec');
url.searchParams.set('reqId', 'example');
url.searchParams.set('penalty', '1');
url.searchParams.set('password', 'example');
url.searchParams.set('outputFormat', 'example');

const response = await fetch(url); 
const data = await response.json();
console.log(data);

package main

import (
	"fmt"
	"io"
	"net/http"
	"net/url"
)

func main() {
	baseURL, _ := url.Parse("https://api.apis.guru/v2/specs/arespass.net/1.0/ec")
	q := baseURL.Query()
	q.Set("reqId", "example")
	q.Set("penalty", "1")
	q.Set("password", "example")
	q.Set("outputFormat", "example")
	baseURL.RawQuery = q.Encode()
	targetURL := baseURL.String()
	req, _ := http.NewRequest("GET", targetURL, nil)

	client := &http.Client{}
	resp, _ := client.Do(req)
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)
	fmt.Println(string(body))
}

require "net/http"
require "json"

uri = URI("https://api.apis.guru/v2/specs/arespass.net/1.0/ec")
uri.query = URI.encode_www_form({
  "reqId" => "example",
  "penalty" => "1",
  "password" => "example",
  "outputFormat" => "example"
})

http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = uri.scheme == "https"

req = Net::HTTP::Get.new(uri)

res = http.request(req)
puts JSON.parse(res.body)

<?php
$url = "https://api.apis.guru/v2/specs/arespass.net/1.0/ec?" . http_build_query([
    "reqId" => "example",
    "penalty" => "1",
    "password" => "example",
    "outputFormat" => "example"
]);
$opts = ["http" => [
    "method" => "GET",
]];
$ctx = stream_context_create($opts);
$res = file_get_contents($url, false, $ctx);
print_r(json_decode($res, true));

Postman Setup Guide

Get Postman ↗

See official documentation for authentication and setup.

What can you build with Arespass?

Arespass is a Company API. Developers commonly use company APIs for:

enriching CRM records with company firmographics
building lead-generation and prospecting tools
verifying business identity and registration details
monitoring competitors and market intelligence
powering B2B data enrichment pipelines

No authentication required. This API is open — no signup or key needed. Ideal for quick prototypes and public-facing features. Arespass is free to use, making it a low-risk choice to experiment with.

New to APIs? Read our beginner's guide

Open documentation ↗