Top URL Checker API alternatives in 2025

As we move into 2025, the demand for reliable URL checking services continues to grow. Developers and businesses alike are seeking robust APIs that can efficiently validate URLs, check for phishing attempts, analyze referral domains, and verify SSL certificates. In this blog post, we will explore some of the best alternatives to the URL Checker API, highlighting their features, capabilities, and ideal use cases. Whether you are looking for security solutions or traffic analysis tools, these APIs offer a range of functionalities to meet your needs.

1. URL Checker API

The URL Checker API allows users to retrieve the original URL behind a shortened URL without the need to access it directly through web browsers. By providing the shortened URL, users can quickly obtain the corresponding original URL, enabling efficient analysis and processing of URLs within applications and systems.

Shortened URLs are commonly used to make long, complex URLs more manageable and shareable. However, they can also pose challenges when trying to determine the actual content or destination of the link. The URL Checker API solves this problem by acting as an intermediary that fetches the original URL on behalf of the user.

With this API, users can simply provide the shortened URL as input, and the API will handle the process of resolving it to the original URL. This eliminates the need for manual effort or opening the link in a web browser, making it suitable for automated systems or applications that require retrieving the underlying URL information.

Key Features and Capabilities of URL Checker API

Check URL: This feature allows users to return the original URL of each shortened URL. By sending a request with the shortened URL, the API responds with the original URL, enabling users to verify links without manual checks.

{"status":true,"originUrl":"https://dolarhoy.com/"}

In this response, the status field indicates whether the resolution was successful, while the originUrl field provides the actual URL that the shortened link points to. This feature is particularly useful for verifying links in marketing campaigns, analyzing data for research, and ensuring content safety in social media.

Need help implementing URL Checker API? View the integration guide for step-by-step instructions.

2. Lite Phishing Checker API

The Lite Phishing Checker API is a powerful tool that allows you to check URLs and determine if they are known phishing attempts. With this API, you can easily validate and safeguard against potential phishing threats by quickly identifying suspicious URLs.

Phishing attacks pose a significant threat to individuals and businesses alike. Cybercriminals employ various techniques to deceive users into sharing sensitive information, such as passwords, financial details, or personal data, through deceptive websites or emails. The Lite Phishing Checker API helps mitigate this risk by providing an automated process to verify URLs and identify potential phishing attempts.

By integrating the Lite Phishing Checker API into your systems, you can proactively assess the safety of URLs. Simply send a request to the API, including the URL you want to check, and the API will analyze it against a comprehensive database of known phishing attempts.

Key Features and Capabilities of Lite Phishing Checker API

Scan URL: This feature checks if a URL is a known phishing attempt. By sending a request with the URL, the API responds with a status indicating whether the URL is safe or potentially harmful.

{"status":200,"data":{"isScam":false,"domain":"metals-api.com","detection":{"type":"domain"}}}

In this response, the isScam field indicates whether the URL is identified as a phishing attempt, while the domain field provides the domain name being checked. This feature is essential for integrating into web security applications, email security systems, and content filtering solutions.

Want to use Lite Phishing Checker API in production? Visit the developer docs for complete API reference.

3. Referral Domain Checker API

The Referral Domain Checker API provides users with the ability to retrieve referral domains of a website, along with backlink counts and ranks. With this API, users can gain valuable insights into the sources of traffic and backlinks to a website, enabling analysis and optimization of their online presence.

By leveraging the Referral Domain Checker API, users can easily retrieve a comprehensive list of referral domains associated with a particular website. Referral domains refer to the websites or platforms from which visitors are directed to the analyzed website. This information is crucial for understanding the sources of incoming traffic and identifying potential opportunities for collaboration or partnerships with other websites.

Key Features and Capabilities of Referral Domain Checker API

Get Referral: This feature allows users to retrieve referral domains along with backlink counts and ranks. By specifying the domain name in the request, users can obtain detailed insights into the backlink landscape for the analyzed domains.

{
    "referrers": [
        {
            "refdomain": "www.dealsourcing.co",
            "backlinks": 112121,
            "dofollow_backlinks": 112121,
            "first_seen": "2021-05-27",
            "domain_inlink_rank": 4
        },
        {
            "refdomain": "dealsourcing.co",
            "backlinks": 109264,
            "dofollow_backlinks": 109264,
            "first_seen": "2021-05-27",
            "domain_inlink_rank": 4
        }
    ]
}

In this response, the refdomain field indicates the referring domain, while backlinks and dofollow_backlinks provide counts of total and dofollow backlinks, respectively. The first_seen field shows when the domain was first detected, and domain_inlink_rank indicates the rank of the domain based on its backlink profile. This feature is invaluable for SEO analysis and traffic optimization strategies.

Ready to test Referral Domain Checker API? Try the API playground to experiment with requests.

4. SSL Certificate Checker API

The SSL Certificate Checker API allows users to verify and validate any SSL certificate present on a website. This API provides extensive information about the host, including the validity of the SSL certificate.

By passing the URL to lookup, users can receive information about the SSL provider and the validity of that certificate. This API is ideal for security companies that want to ensure that websites are safe for their users and that they have the necessary certificates to operate.

Key Features and Capabilities of SSL Certificate Checker API

Check: This feature checks the validity of an SSL certificate and returns detailed certificate information. Users can specify the URL of the website they want to check, allowing for targeted SSL certificate validation.

{
    "subject": {
        "jurisdictionC": "US",
        "jurisdictionST": "Delaware",
        "businessCategory": "Private Organization",
        "serialNumber": "3014267",
        "C": "US",
        "ST": "California",
        "L": "San Jose",
        "O": "PayPal, Inc.",
        "CN": "www.paypal.com"
    },
    "issuer": {
        "C": "US",
        "O": "DigiCert Inc",
        "OU": "www.digicert.com",
        "CN": "DigiCert SHA2 Extended Validation Server CA"
    },
    "validFrom": "2024-06-13T00:00:00.000Z",
    "validTo": "2025-06-12T23:59:59.000Z",
    "expiresInDays": 215,
    "fingerprint": "B8:52:A5:56:6A:3C:F4:6B:0F:90:23:FA:3E:26:C8:8B:BA:55:D3:C9",
    "fingerprint256": "BA:3F:8D:7F:72:A6:A3:5A:6E:BF:15:31:D0:79:1B:43:DA:2C:6D:0F:56:72:19:44:64:E9:40:62:7A:C7:8B:62",
    "serialNumber": "0F689F7274A957992808A5B060F2E4E8",
    "pem": "-----BEGIN CERTIFICATE-----\nMIIR6DCCENCgAwIBAgIQD2ifcnSpV5koCKWwYPLk6DANBgkqhkiG9w0BAQsFADB1\nMQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3\nd3cuZGlnaWNlcnQuY29tMTQwMgYDVQQDEytEaWdpQ2VydCBTSEEyIEV4dGVuZGVk\nIFZhbGlkYXRpb24gU2VydmVyIENBMB4XDTI0MDYxMzAwMDAwMFoXDTI1MDYxMjIz\nNTk1OVowgcYxEzARBgsrBgEEAYI3PAIBAxMCV...

In this response, the subject field contains information about the entity that the certificate is issued to, including jurisdiction, organization, and common name (CN). The issuer field provides details about the certificate authority that issued the SSL certificate. The validFrom and validTo fields indicate the certificate's validity period, while expiresInDays shows how many days remain until expiration. The fingerprint and fingerprint256 fields provide unique identifiers for the certificate, and the pem field contains the certificate in PEM format. This feature is crucial for security audits, compliance checks, and monitoring SSL certificate validity.

Want to use SSL Certificate Checker API in production? Visit the developer docs for complete API reference.

Conclusion

In conclusion, as we look ahead to 2025, the landscape of URL checking APIs is rich with alternatives that cater to various needs. The URL Checker API remains a strong choice for retrieving original URLs from shortened links. However, if your focus is on security, the Lite Phishing Checker API is invaluable for identifying phishing threats. For those interested in traffic analysis, the Referral Domain Checker API provides essential insights into backlink profiles. Lastly, the SSL Certificate Checker API is crucial for ensuring the safety and validity of SSL certificates on websites.

Ultimately, the best alternative depends on your specific requirements—whether it's security, traffic analysis, or URL validation. By understanding the features and capabilities of these APIs, you can make an informed decision that aligns with your development goals.