Daily Ad Spend Monitoring with Google Sheets and Slack Threshold Alerts

This n8n workflow checks daily ad spend totals from a Google Sheet and sends a Slack alert if spend exceeds $100. It can be scheduled to run automatically or manually triggered for testing. This is perfect for marketing teams who want to monitor budget spikes in near real-time.

✅ Key Features

📥 Google Sheets Integration**: Pulls raw spend data from a shared spreadsheet. 📆 Scheduled or Manual Execution**: Can run daily on a schedule or manually for testing. 📈 Aggregates Spend**: Summarizes daily totals from raw data. 🧠 Logic Check**: Alerts only when spend exceeds a certain threshold. 🔔 Slack Alerts**: Sends instant notification to a specified channel.

🧰 What You'll Need

Google Cloud Project** with Sheets API enabled OAuth2 Credential** for Google Sheets Slack Bot Token** with permission to post to your workspace Your Google Sheet link and tab name**

📎 Copy this Sample Google Sheet to Use:
Marketing Data Sheet - Copy Me

🔧 Step-by-Step Setup

1️⃣ Schedule or Manual Trigger Node**: Schedule Workflow or Test Workflow Purpose**: Either run daily via a cron-like rule or manually trigger the flow.

2️⃣ Get Google Sheet Data Node**: Get Data What it does**: Fetches all rows from your connected sheet. Setup**: Go to Google Cloud Console Create a new project Enable Google Sheets API Create OAuth2 credentials for a desktop or web application Connect your Google account in n8n via OAuth2 Grant access to the sheet you want to read (ensure it's shared with your OAuth email) Use the copied sheet's link when connecting in n8n

3️⃣ Summarize Spend by Day Node**: Sum spend by Day What it does**: Groups the dataset by Date and sums the Spend ($) column Requirements**: Your sheet must have a header row with Date and Spend ($) as columns

4️⃣ Sort by Most Recent Date Node**: Sort Dates Descending What it does**: Sorts all entries by the Date field so that the most recent day is first Custom JavaScript**: const items = $input.all(); items.sort((a, b) => new Date(b.json.Date) - new Date(a.json.Date)); return items;

5️⃣ Select Top Result Node**: Keep only Last Day What it does**: Captures the top row (most recent day) for evaluation Fields**: Sets only Date and sum_Spend_($) to keep things clean

6️⃣ Check Spend Threshold Node**: Check if Spend over $100 What it does**: Uses an IF node to compare sum_Spend_($) against a 100 threshold Logic**: sum_Spend_($) > 100

7️⃣ Send Slack Notification Node**: Send Slack Message What it does**: Sends a message to a Slack channel if the threshold is exceeded Setup**: Go to Slack API Create a new app Enable chat:write and channels:read scopes under OAuth & Permissions Install the app to your workspace Copy the OAuth Token into your Slack credentials in n8n Select your target channel from the dropdown (must be public or the bot must be invited) Message**: The spend for the most recent day is over $100 8️⃣ No Action if Under Budget Node**: Do Nothing. Under 100 Purpose**: This path simply ends the flow with no action if spend is below the threshold

👤 Created By Robert Breen
Automation Consultant | AI Workflow Designer | n8n Expert
📧 rbreen@ynteractive.com
🌐 ynteractive.com
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🏷️ Tags slack marketing automation budget alert daily schedule google sheets threshold logic n8n spend tracking data summarization