How to Build a 24/7 Competitor Backlink Monitor with n8n (for Free)

Manual backlink checking is a relic of the past. It’s time-consuming, inconsistent, and, frankly, a waste of your valuable time. By the time you manually spot a high-value link your competitor has earned, the opportunity to replicate that success has often diminished. You’re playing catch-up, not leading the charge.

What if you had a personal spyglass, an automated system that watched your competitors’ link profiles 24/7 and alerted you the moment they landed a new link? This isn’t a fantasy; it’s what you can build in under an hour with n8n.

This guide will provide a step-by-step walkthrough to create an n8n workflow that automatically monitors a competitor’s backlinks and notifies you of new discoveries. Let’s get started.

Choosing Your Weapon: Affordable Backlink APIs

The world of SEO is dominated by giants like Ahrefs and Semrush, whose comprehensive toolsets come with a hefty price tag, especially for API access. For lean operations or personal projects, this can be a significant barrier.

Fortunately, a new class of powerful, API-first tools has emerged, offering flexible and affordable access to high-quality backlink data.

• SE Ranking: This will be our primary tool for this tutorial. SE Ranking offers a powerful Backlink Checker API and, most importantly, a generous 100,000 credit free trial. This is more than enough to get our monitoring system up and running at no cost, making it the perfect choice for this project.
• Majestic: A veteran in the link intelligence space, Majestic offers a robust API with a pay-as-you-go pricing model, making it a great scalable option.
• Others: Services like Bishopi.io and Link-Assistant also provide capable APIs for more specific use cases.

We’ll focus on SE Ranking for this guide due to its accessibility and excellent free tier, which allows anyone to follow along and build a production-ready workflow from day one.

The Workflow Blueprint

Here’s a high-level overview of the n8n workflow we are about to build:

1. Schedule Trigger: The workflow will run automatically once a day.
2. HTTP Request: It will make a call to the SE Ranking API to fetch the latest backlinks for a specified competitor domain.
3. Data Pruning: The results will be filtered to isolate only the backlinks that were discovered within the last 24 hours.
4. IF Node: A conditional check to see if any new backlinks were actually found.
5. Data Formatting: A function to arrange the data into a clean, human-readable summary (e.g., Source URL, Anchor Text, Link Type).
6. Notification: The formatted summary will be sent to a specified Slack channel or email address.
7. (Optional) Google Sheets Logging: We’ll add a final step to log every new link to a Google Sheet, creating a valuable historical database of your competitor’s link-building activities.

Step-by-Step Implementation Guide

Part A: Getting Your SE Ranking API Key

First things first, you need an API key.

1. Navigate to the SE Ranking Backlink Checker API page.
2. Sign up for the free trial. This will give you immediate access to the API and your 100,000 free credits.
3. Once registered, go to your account settings or the API documentation section to find your unique API token. Keep this token handy; you’ll need it in the next step.

Part B: Building the Workflow in n8n

Now, let’s open up a blank canvas in n8n and start building.

(Note: In the final version of this article, this section will be heavily illustrated with screenshots for each step.)

1. Create a Schedule Trigger Node: Add a new Schedule Trigger node and set it to run once every day at a time of your choosing.

2. Add an HTTP Request Node:

   • URL: https://api.seranking.com/v2/backlinks/overview-history
   • Method: POST
   • Send Headers: Add a header with the name Authorization and the value Token YOUR_API_TOKEN (replace YOUR_API_TOKEN with your key).
   • Send JSON: Use the following JSON body, replacing "yourcompetitor.com" with the domain you want to track.

     {
         "target": "yourcompetitor.com"
     }

3. Add a Function Node for Filtering: This node will contain JavaScript code to filter for new links.

   const items = $('HTTP Request').all();
   const yesterday = new Date();
   yesterday.setDate(yesterday.getDate() - 1);
   
   const newLinks = items.filter(item => {
     const discoveredDate = new Date(item.json.first_seen);
     return discoveredDate >= yesterday;
   });
   
   return newLinks;

4. Add an IF Node: Configure the IF node to check if the output from the “Filter New Links” node is not empty. This ensures we only proceed if there’s something new to report.

5. Add another Function Node for Formatting: If new links were found, this node will format them for the notification.

   const items = $input.all();
   let message = `*New Backlinks Found for ${items[0].json.target}:*\n\n`;
   
   for (const item of items) {
     message += `• *Source:* ${item.json.page_from_url}\n`;
     message += `  *Anchor:* ${item.json.anchor_text}\n`;
     message += `  *Type:* ${item.json.is_dofollow ? 'Dofollow' : 'Nofollow'}\n\n`;
   }
   
   return [{ json: { message: message } }];

Part C: Setting up Notifications

You have two primary options here: Slack or Email.

• For Slack: Add a Slack node, connect your credentials, and in the “Text” field, use an expression to insert the formatted message from the previous node: {{ $('Format for Slack').first().json.message }}.
• For Email: Add an Email node, configure your SMTP settings, and use the same expression in the email body.

Conclusion: Go Beyond Simple Monitoring

You now have a fully automated backlink monitoring system. This workflow not only saves you countless hours but also provides you with the timely intelligence needed to compete effectively.

What’s next? This is just the beginning. You can expand this workflow to:

• Monitor multiple competitors by adding them to your trigger node.
• Analyze the distribution of anchor text to spot SEO trends.
• Enrich the data by piping it through other APIs to get domain authority scores or social share counts.

The power of n8n lies in its flexibility. If you’re ready to build more advanced, custom SEO automation solutions for your business, contact us at Marden SEO. We turn complex SEO processes into streamlined, automated assets.