Filter fraudulent leads with GPT-4o-mini, AbstractAPI, Google Sheets and Slack

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1. Workflow Overview

This n8n template serves as a security layer for your marketing efforts, ensuring that only high quality, human verified leads reach your CRM while automatically blacklisting bots and VPN based sub...

Best for

SecOps automation workflows
AI Summarization automation workflows
advanced n8n builders looking for reusable templates

Tools used

n8n-nodes-base.webhook, n8n-nodes-base.httprequest, @n8n/n8n-nodes-langchain.openai, n8n-nodes-base.merge, n8n-nodes-base.if, n8n-nodes-base.googlesheets, n8n-nodes-base.slack, n8n-nodes-base.stickynote

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Nithish R..

Original n8n.io source

1.1 Workflow description

Title: Filter fraudulent leads with GPT-4o-mini, AbstractAPI, Google Sheets and Slack
Workflow name: Filter fraudulent leads with GPT-4o-mini, AbstractAPI, Google Sheets and Slack

This n8n template serves as a security layer for your marketing efforts, ensuring that only high-quality, human-verified leads reach your CRM while automatically blacklisting bots and VPN-based submissions.

How it works

Lead Intake: The workflow triggers via a Webhook (e.g., from Tally.so or other form builders) when a new lead is submitted.

Dual-Layer Analysis:

IP Intelligence: It queries AbstractAPI to check the lead's IP address for red flags like VPNs, proxies, or data centre origins.
AI Intent Analysis: Simultaneously, it sends the name and message to GPT-4o-mini to analyse the content for non-human patterns, gibberish, or spam scripts.
Smart Filtering: A Merge node combines these data points, and an If Node applies "OR" logic: if the IP is a VPN/Proxy OR the AI detects spam, the lead is flagged.

Automated Action:

Verified Leads: Legitimate submissions are saved to a "Verified" Google Sheet for sales follow-up.
Fraud Prevention: Flagged leads are moved to a "Potential Spam" sheet. This list can be synced as an exclusion audience in Google or Meta Ads to prevent wasting budget on retargeting bots.

Instant Alerts: The team is notified immediately via Slack whenever a fraudulent submission is neutralized.

Requirements

OpenAI API Key: For lead content analysis.
AbstractAPI Key: For IP intelligence & security flags.
Google Sheets: To store verified and blacklisted lead data.
Slack: For real-time fraud alerts.

Customising this workflow

Field Mapping: If your form uses different labels (e.g., "Comments" instead of "Message"), update the expressions in the Message model and Google Sheets nodes.
Exclusion Logic: You can tighten the filter by adding more conditions to the If Node, such as specific country blocking or email domain validation.

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - Webhook

Type / Role: n8n-nodes-base.webhook - webhook
Config choices: Version 2.1

Block 2 - HTTP Request

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.4

Block 3 - Message a model

Type / Role: @n8n/n8n-nodes-langchain.openAi - openAi
Config choices: Version 2.1

Block 4 - Merge

Type / Role: n8n-nodes-base.merge - merge
Config choices: Version 3.2

Block 5 - If

Type / Role: n8n-nodes-base.if - if
Config choices: Version 2.3

Block 6 - Verified Leads

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4.7

Block 7 - Potential Spam

Type / Role: n8n-nodes-base.googleSheets - googleSheets
Config choices: Version 4.7

Block 8 - Spam Alert

Type / Role: n8n-nodes-base.slack - slack
Config choices: Version 2.4

Block 9 - Sticky Note2

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 10 - Sticky Note3

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 11 - Sticky Note4

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 12 - Sticky Note5

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 13 - Sticky Note6

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 14 - Sticky Note7

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 15 - Sticky Note12

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 16 - Sticky Note

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

3. Summary Table

Workflow	Filter fraudulent leads with GPT-4o-mini, AbstractAPI, Google Sheets and Slack
Complexity	advanced
Nodes	16
Categories	SecOps, AI Summarization
Author	Nithish R.
Published	28 Feb 2026

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/13774/13774.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source SecOps workflows AI Summarization workflows

Frequently asked questions

What does Filter fraudulent leads with GPT-4o-mini, AbstractAPI, Google Sheets and Slack do?

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your SecOps, AI Summarization use case.

Nithish R.

2 workflows

Nodes

n8n-nodes-base.webhook n8n-nodes-base.httprequest @n8n/n8n-nodes-langchain.openai n8n-nodes-base.merge n8n-nodes-base.if n8n-nodes-base.googlesheets n8n-nodes-base.slack n8n-nodes-base.stickynote

Complexity

advanced

Published 28 Feb 2026

Likes 0

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Install path: /data/workflows/13774/13774.json

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Filter fraudulent leads with GPT-4o-mini, AbstractAPI, Google Sheets and Slack

Workflow preview

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

How it works

Requirements

Customising this workflow

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Webhook

Block 2 - HTTP Request

Block 3 - Message a model

Block 4 - Merge

Block 5 - If

Block 6 - Verified Leads

Block 7 - Potential Spam

Block 8 - Spam Alert

Block 9 - Sticky Note2

Block 10 - Sticky Note3

Block 11 - Sticky Note4

Block 12 - Sticky Note5

Block 13 - Sticky Note6

Block 14 - Sticky Note7

Block 15 - Sticky Note12

Block 16 - Sticky Note

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions