As we all know, spam is more than just a nuisance, it's a significant crucial security threat. Whether you're managing email communications and newsletters, moderating website comments, or securing a WordPress site, implementing robust spam detection is essential for both user experience and security. This article explores the five best spam detection APIs available in 2025, with a special focus on Fortguard—an emerging leader in the antispam software market. These tools offer powerful capabilities for organizations seeking to integrate spam detection into their applications, websites, and communication channels.
Why Spam Detection?
Before talking about why spam detection, let’s see briefly what is spam and what common types of spam are.
What is SPAM?
Spam is unsolicited and unwanted digital communications sent in bulk to indiscriminate recipients for commercial or malicious purposes.
Common Types of Spam
There are several types of spam and the most common types of spam are,
Email Spam - 85% of the email traffic
Comment Spam - on blogs, forums, and websites
Form Spam - contact and registration forms
Social Media - fake profiles and bots
With these, any kind of spam, phishing, malware, resource drain, and reputation loss is caused without a doubt.
The importance of effective spam detection extends far beyond simply avoiding annoying messages. Here's why implementing robust spam detection APIs is critical in 2025:
Security Protection
Modern spam often contains malicious links, phishing attempts, and malware that can compromise systems and steal sensitive data. Effective spam detection serves as a crucial first line of defense against these threats.
Conservation of Resources
Spam consumes bandwidth, storage space, and processing power. For businesses handling large volumes of communications, this translates to significant unnecessary costs.
User Experience
Nothing damages user experience faster than inundating customers with spam. Clean, relevant communication channels build trust and improve engagement.
Regulatory Compliance
Many industries face strict regulations about communication security and data protection. Spam detection helps organizations maintain compliance with these requirements.
Reputation Management
Businesses that fail to control spam on their platforms risk damage to their brand reputation and loss of customer trust.
Productivity Enhancement
Employees spend an average of 30 minutes daily dealing with unwanted messages. Across an organization, this time loss represents a substantial hit to productivity.
Protection Against Sophisticated Attacks
As AI advances, so do spam techniques. Modern attacks use sophisticated methods that require equally advanced detection systems.
As these challenges continue to evolve, implementing a powerful spam detection API becomes not just beneficial but essential for digital operations.
1. Fortguard
At HYVOR, we have been using ML Spam Detection Tools such as Akismet in our main product Hyvor Talk. But with time, we realized that spam detection using ML is a tad less accurate and there is a much better way using Large Language Models (LLMs). Therefore, we were hunting for a spam detection API to meet our requirements. Unfortunately, we could not find any. Hence we started building our own spam detection API.
And that is how Fortguard comes to you carefully designed by us, HYVOR.
FortGuard stands out as a state-of-the-art spam detection API designed for various applications, including commenting systems, forums, and email clients. Unlike many spam detection services that provide a simple binary result -spam or not- FortGuard offers a more nuanced approach with multiple data points about content and IP addresses. This allows users to tailor the spam detection process to their specific needs.
Here are the features that Fortguard offers you.
Key Features of FortGuard:
Advanced Content Spam Detection - Human-like accuracy: FortGuard utilizes Large Language Models (LLMs) such as OpenAI's GPT-3.5 and GPT-4 for content analysis. These models are trained on vast amounts of data, enabling them to understand the context of content and accurately detect spam. This capability is particularly useful for differentiating spam and legitimate content in various contexts. This ensures human-like accuracy, with great context awareness.
Language Detection & Sentiment Analysis: Fortguard’s API detects the language and possible sentiments of the content, in the same API call. You can configure the API to return additional data such as language detection and sentiment analysis. This enables more sophisticated spam detection strategies and allows for fine-tuned control over what is considered spam. In other words, it filters out content that is not in the language you support or to filter out negative content.
IP Geolocation: FortGuard’s IP check provides comprehensive data about IP addresses, helping to identify and block spammy IPs. This includes data on whether an IP is associated with spam activity, proxies, VPNs, or known abusers.
Privacy-Focused: FortGuard prioritizes user privacy. It does not log or store any data sent to its API, ensuring that user information remains confidential. There are no tracking scripts, and only essential cookies are used for login purposes.
FortGuard is a privacy-focused service. Briefly, We
do not log any data that you send to our content check API.
do not store any IP addresses that you send to our IP check API.
do not sell your personal data to third parties.
do not track you when using our websites
No analytics or any other tracking scripts
Only essential (login) cookies
Analytics: You can easily track the usage of your API key in the Console. See API logs with metadata such as response time, status code, and more. You can set maximum monthly usage limits to prevent unexpected bills.
Diving into Fortguard furthermore, it has 3 API endpoints.
API Endpoints:
1. Content Check (/check/content): Analyzes a piece of content for spam and can return additional data points like language and sentiment.
For example, here is a request.
1{2 "model": "gpt-3.5",3 "context": "10 Healthy Habits to Boost Your Productivity",4 "content": "Click the link in my profile!",5 "language_detection": false,6 "sentiment_analysis": false,7 "sentiments": ['positive', 'negative', 'neutral'],8}9Here is its response.
1{2 "spam_score": 5,3 "language_code": null,4 "sentiments": [],5}62. IP Check (/check/ip): Provides detailed information about an IP address to detect potential spam sources.
For example, here is a request.
1{2 "ip": "141.98.215.233"3}And its response.
1{ 2 "ip": "141.98.215.233", 3 "is_bogon": false, 4 "is_mobile": false, 5 "is_datacenter": true, 6 "is_tor": false, 7 "is_proxy": false, 8 "is_vpn": false, 9 "is_abuser": true,10 "location": {11 "continent": "AS",12 "country": "Philippines",13 "country_code": "PH",14 "state": "",15 "city": "Manila",16 "latitude": 14.6042,17 "longitude": 120.9822,18 "zip": "",19 "timezone": "Asia/Manila",20 "local_time": "2023-11-06T15:30:22+08:00",21 "local_time_unix": 1699255822,22 "is_dst": false23 },24 "company": {25 "name": "ESTNOC-GLOBAL",26 "domain": "estnoc.ee",27 "type": "business",28 "network": "141.98.215.0 - 141.98.215.255",29 },30 "datacenter": {31 "datacenter": "Shock Hosting LLC",32 "domain": "shockhosting.net",33 "network": "141.98.212.0 - 141.98.215.255"34 },35 "asn": {36 "asn": 206804,37 "route": "141.98.215.0/24",38 "descr": "ESTNOC-GLOBAL, EE",39 "country": "ee",40 "active": true,41 "org": "EstNOC OY",42 "domain": "www.estnoc.ee",43 "type": "hosting",44 "created": "2016-11-03",45 "updated": "2023-10-13",46 "rir": "ripe",47 }48}493. All Check (/check): Combines both content and IP checks in a single request for comprehensive spam detection.
For example, here is a request and its response.
1// request 2{ 3 "content": {}, // content endpoint input 4 "ip": {} // ip endpoint input 5} 6FortGuard’s approach of providing detailed insights rather than simple binary results makes it a powerful tool for users seeking a flexible and privacy-conscious spam detection solution.
Do you have a WordPress site?
If you have a WordPress site, FortGuard is available as a WordPress plugin. You can easily integrate FortGuard into your WordPress website with a few clicks. You need to sign up at Fortguard to get an API key. Our Fortguard WordPress anti spam plugin comes in handy in managing spam on your WordPress site.
2. CleanMail API
CleanMail has long been a trusted name in spam detection, and its API continues to excel in 2025. Their solution leverages behavioral analysis alongside content filtering to deliver accurate results.
Email-focused spam detection
Content and metadata analysis
Reputation scoring system
GDPR-compliant processing
Flexible integration options
Comprehensive analytics dashboard
CleanMail excels particularly in email spam detection, making it ideal for companies developing email clients or communication platforms.
3. OopSpam
OOPSpam has emerged as a powerful contender in the spam detection API market, offering advanced technical capabilities that appeal particularly to developers and technical teams. Their object-oriented approach to spam detection (hence the name) provides exceptional flexibility.
Key Features:
High-performance REST API with 99.5% accuracy
Specialized form and comment spam protection
Machine learning algorithms that adapt to emerging threats
IP reputation database integration
Advanced content analysis for profanity and inappropriate content
GDPR compliance and data protection features
Detailed API documentation with multiple integration examples
OOPSpam's developer-centric approach and transparent pricing model make it an excellent choice for technical teams looking to implement custom spam protection solutions across various platforms.
4. SpamShield Pro
SpamShield Pro offers one of the solutions in the spam detection market. Their solution is mainly focused on WordPress as a plugin
Comment and form submission filtering
Social media content moderation capabilities
WordPress plugin with one-click setup
Machine learning models that improve over time
Excellent customer support
Detailed threat reporting
SpamShield's strength lies in its versatility, making it suitable for a wide range of applications beyond just email filtering.
5. Akismet
Akismet a WordPress anti-spam software, has evolved significantly since its inception. As one of the most widely used spam detection solutions globally, it protects millions of websites from comment and contact form spam.
Automatic filtering of comments and form spam
Seamless WordPress integration as the platform's default anti-spam tool
Historical spam pattern recognition
Minimal false positives through continuous learning
Easy-to-use dashboard showing spam statistics
API access for custom integrations beyond WordPress
Tiered pricing from free personal plans to enterprise solutions
If you feel like Akismet is not your choice, you can always look for Akismet alternatives.
Choosing the Right Spam Detection API
When selecting a spam detection API for your specific needs, consider these factors:
Accuracy rate: Look for solutions with proven high detection rates and low false positives. For example, Fortguard.
Integration ease: Consider how easily the API can be implemented within your existing infrastructure. For example, Fortguard.
Scalability: Ensure the solution can grow with your needs without significant cost increases. For example, Fortguard.
Support for your platforms: If you use WordPress or other specific blogging platforms or any other platform, check for dedicated integration. For example, Fortguard.
Pricing structure: Compare pricing models to find one that aligns with your usage patterns. For example, Fortguard.
Conclusion
Implementing a reliable spam detection API is essential for maintaining security and user experience in 2025's increasingly complex digital landscape. Fortguard leads our list due to its exceptional balance of accuracy, features, and value, but each of the five APIs covered offers unique strengths that might make them the ideal choice for your specific requirements.
Whether you're protecting a WordPress site, securing email communications, or moderating user-generated content, these tools provide the capabilities needed to stay ahead of evolving spam threats.
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