{ "id": "9yDOkFUPxgUrmtmL", "name": "Smart Price Monitor with AI Prediction v2", "tags": [], "nodes": [ { "id": "a2c0086c-f856-46c2-818e-d4f1c2b00bd9", "name": "Manual Trigger", "type": "n8n-nodes-base.manualTrigger", "position": [ -2864, -128 ], "parameters": {}, "typeVersion": 1 }, { "id": "8533cf84-9cb4-42b0-8f6e-02b91d6ad1d7", "name": "Sticky Note", "type": "n8n-nodes-base.stickyNote", "position": [ -3696, -704 ], "parameters": { "width": 684, "height": 516, "content": "## Smart Price Monitor with AI\n\n**How it works**\n1. Fetches products from your Google Sheets\n2. Scrapes current Amazon prices\n3. Tracks price history (60 days)\n4. AI analyzes trends using GPT-4o-mini\n5. Sends email alerts for buying opportunities\n6. Updates tracking sheet with recommendations\n\n**Setup**\n\u2611 Connect Google Sheets OAuth2\n\u2611 Connect Gmail OAuth2\n\u2611 Add OpenAI API key\n\u2611 Create two sheets: \"Products\" and \"Price History\"\n\u2611 Replace placeholder IDs with your Google Sheets document ID\n\n**Customize**\n\u2022 Change schedule trigger for automation\n\u2022 Adjust CSS selector for non-Amazon sites\n\u2022 Modify AI model (gpt-4o-mini \u2194 gpt-4o) for a better analysis" }, "typeVersion": 1 }, { "id": "9f5353ae-948a-4ed0-bf13-d7b0ec9b8a2a", "name": "Sticky Note1", "type": "n8n-nodes-base.stickyNote", "position": [ -2928, -704 ], "parameters": { "color": 7, "width": 596, "height": 768, "content": "## Section 1. Get products to monitor\n\n### Purpose: \nGets the urls products from your google sheet product.\n\n### What it does:\n- Connects to your Google Sheets document\n- Reads all rows from the \"Products\" sheet\n- Each row contains: Product URL, Name, Target Price, and your Email\n\n### Required columns in your sheet:\n- URL_Product: Amazon product link\n- Product_Name: Product description\n- Target_Price: Your desired purchase price\n- User_Email: Email for notifications" }, "typeVersion": 1 }, { "id": "99dcb462-5727-446f-84e3-905e7c624705", "name": "Sticky Note2", "type": "n8n-nodes-base.stickyNote", "position": [ -2288, -464 ], "parameters": { "color": 6, "width": 684, "height": 528, "content": "## Section 2. Fetch & extract price\n\n### **Purpose**:\nExtract the URL that you want to monitor in Amazon\n\n### **What it does:**\n- Visits the product URL from your sheet\n- Searches the HTML for the price element\n- Extracts just the price number\n" }, "typeVersion": 1 }, { "id": "5eab55ab-c20d-4804-a981-f5e881026799", "name": "Sticky Note3", "type": "n8n-nodes-base.stickyNote", "position": [ -1568, -448 ], "parameters": { "color": 7, "width": 692, "height": 512, "content": "## 3. Track price history\n\n### Purpose: \nRetrieves past price records for this product and records current price in the history sheet\n\n### What it does:\n- Searches \"Price History\" sheet for this product's URL\n- Gets all previous price checks (up to 60 days)\n- Checks if price was already recorded today\n- Adds new row to \"Price History\" sheet" }, "typeVersion": 1 }, { "id": "b1120fb3-d5ac-4845-8c16-97bb0c96c100", "name": "Sticky Note4", "type": "n8n-nodes-base.stickyNote", "position": [ -816, -544 ], "parameters": { "color": 6, "width": 876, "height": 608, "content": "## 4. AI analysis: is the perfect price for me?\n\n### Purpose:\nCalculates statistics and formats data for AI analysis, makes recomendations and creates visual price history chart\n\n### What it does:\n- Calculates 60-day average price\n- Finds minimum and maximum prices\n- Sends price data to OpenAI's GPT model\n- AI analyzes trends, patterns, and statistics\n- Predicted Trend: RISING/FALLING/STABLE\n- Generates buy/wait recommendation\n- Uses QuickChart.io API to generate chart\n- Shows last 30 days of price data\n- Displays your target price as reference line\n- Creates chart URL for email" }, "typeVersion": 1 }, { "id": "d2f6a4a6-8417-45fe-8ff1-fc83ec269ca0", "name": "Sticky Note5", "type": "n8n-nodes-base.stickyNote", "position": [ 80, -688 ], "parameters": { "color": 7, "width": 740, "height": 752, "content": "## 5. Notify & update: let me now if I should by the product\n\n### Purpose:\nNotifies you of buying opportunity and records latest analysis in your tracking sheet\n\n### What it does:\n- Sends detailed email to your address\n- Includes AI recommendation and analysis\n- Updates the product row in \"Products\" sheet with latest price check results\n- Saves AI recommendations and scores\n\n### Updated fields:\n- Last_Price: Current price found\n- Last_Check: When check was performed\n- AI_Recommendation: BUY or WAIT\n- AI_Confidence: Confidence percentage\n- Urgency_Score: Deal urgency (0-100)\n- Predicted_Trend: Price direction\n- Should_Buy: Yes/No decision" }, "typeVersion": 1 }, { "id": "6253563b-4b22-4475-9bc9-3e4a3446a417", "name": "Sticky Note6", "type": "n8n-nodes-base.stickyNote", "position": [ -2704, -288 ], "parameters": { "color": 3, "width": 308, "height": 348, "content": "\u26a0\ufe0f **Replace placeholder IDs**\n\nUpdate `YOUR_GOOGLE_SHEETS_DOCUMENT_ID` in all Google Sheets nodes with your actual document ID." }, "typeVersion": 1 }, { "id": "ff73629f-2c1a-462c-b32d-729d600e7779", "name": "Sticky Note7", "type": "n8n-nodes-base.stickyNote", "position": [ -1856, -256 ], "parameters": { "color": 3, "width": 224, "height": 300, "content": "\u26a0\ufe0f **CSS Selector**\n\nFor non-Amazon sites, update `.a-price-whole` selector using browser DevTools." }, "typeVersion": 1 }, { "id": "5b467790-afcc-46e8-a7f8-1ce628a48837", "name": "Get Products", "type": "n8n-nodes-base.googleSheets", "position": [ -2592, -128 ], "parameters": { "options": {}, "sheetName": { "__rl": true, "mode": "list", "value": 807909088, "cachedResultUrl": "https://docs.google.com/spreadsheets/d/YOUR_GOOGLE_SHEETS_DOCUMENT_ID/edit#gid=807909088", "cachedResultName": "Products_Sheet_Template" }, "documentId": { "__rl": true, "mode": "list", "value": "YOUR_GOOGLE_SHEETS_DOCUMENT_ID", "cachedResultUrl": "https://docs.google.com/spreadsheets/d/YOUR_GOOGLE_SHEETS_DOCUMENT_ID/edit?usp=drivesdk", "cachedResultName": "Products_Sheet_Template" } }, "credentials": { "googleSheetsOAuth2Api": { "name": "" } }, "typeVersion": 4.7 }, { "id": "acfc302f-9350-4114-ae25-97b7c34e5078", "name": "Loop Products", "type": "n8n-nodes-base.splitInBatches", "position": [ -2256, -128 ], "parameters": { "options": { "reset": false } }, "typeVersion": 3 }, { "id": "6c2ed912-8ba1-4e4a-884d-73382595da90", "name": "Fetch Product Page", "type": "n8n-nodes-base.httpRequest", "position": [ -2032, -112 ], "parameters": { "url": "={{ $json.URL_Product }}", "options": { "timeout": 30000 }, "sendHeaders": true, "headerParameters": { "parameters": [ { "name": "User-Agent", "value": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36" } ] } }, "typeVersion": 4.2 }, { "id": "3010b968-8de8-49ec-8c14-9f545c0d4452", "name": "Get Price History", "type": "n8n-nodes-base.googleSheets", "position": [ -1488, -112 ], "parameters": { "options": {}, "filtersUI": { "values": [ { "lookupValue": "={{ $('Loop Products').item.json.URL_Product }}", "lookupColumn": "URL_Product" } ] }, "sheetName": { "__rl": true, "mode": "list", "value": 877762684, "cachedResultUrl": "https://docs.google.com/spreadsheets/d/YOUR_GOOGLE_SHEETS_DOCUMENT_ID/edit#gid=877762684", "cachedResultName": "Price_History_Sheet_Template" }, "documentId": { "__rl": true, "mode": "list", "value": "YOUR_GOOGLE_SHEETS_DOCUMENT_ID", "cachedResultUrl": "https://docs.google.com/spreadsheets/d/YOUR_GOOGLE_SHEETS_DOCUMENT_ID/edit?usp=drivesdk", "cachedResultName": "Price_History_Sheet_Template" } }, "credentials": { "googleSheetsOAuth2Api": { "name": "" } }, "typeVersion": 4.7, "alwaysOutputData": true }, { "id": "43183e68-bb8c-490c-ad6b-d51e3e31cf69", "name": "Check Duplicate", "type": "n8n-nodes-base.code", "position": [ -1264, -112 ], "parameters": { "jsCode": "// Get current data\nconst productUrl = $('Get Products').first().json.URL_Product;\nconst currentPrice = parseFloat($('Extract Price').first().json.price.replace(/[$,]/g, ''));\nconst today = $now.toFormat('yyyy-MM-dd');\nconst timestamp = $now.toISO();\n\n// Get existing history for this product today\nconst historyItems = $('Get Price History').all();\n\n// Check if there's already a record for this product today\nconst existingTodayRecord = historyItems.find(item => \n item.json.URL_Product === productUrl && \n item.json.Date === today\n);\n\n// Prepare the data to return (will be used by next node to update sheet)\nreturn {\n url_product: productUrl,\n price: currentPrice,\n date: today,\n timestamp: timestamp,\n should_update: !!existingTodayRecord,\n row_number: existingTodayRecord ? existingTodayRecord.json.row_number : null\n};" }, "typeVersion": 2 }, { "id": "c152c0d6-8822-4521-828d-b36bb8d6c5c3", "name": "Add to History", "type": "n8n-nodes-base.googleSheets", "position": [ -1040, -112 ], "parameters": { "columns": { "value": { "Date": "={{ $now }}", "Price": "={{ $('Extract Price').first().json.price }}", "Timestamp": "={{ $now }}", "URL_Product": "={{ $('Loop Products').first().json.URL_Product }}" }, "schema": [ { "id": "URL_Product", "type": "string", "display": true, "required": false, "displayName": "URL_Product", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "Price", "type": "string", "display": true, "required": false, "displayName": "Price", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "Date", "type": "string", "display": true, "required": false, "displayName": "Date", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "Timestamp", "type": "string", "display": true, "required": false, "displayName": "Timestamp", "defaultMatch": false, "canBeUsedToMatch": true } ], "mappingMode": "defineBelow", "matchingColumns": [], "attemptToConvertTypes": false, "convertFieldsToString": false }, "options": {}, "operation": "append", "sheetName": { "__rl": true, "mode": "list", "value": 877762684, "cachedResultUrl": "https://docs.google.com/spreadsheets/d/YOUR_GOOGLE_SHEETS_DOCUMENT_ID/edit#gid=877762684", "cachedResultName": "Price_History_Sheet_Template" }, "documentId": { "__rl": true, "mode": "list", "value": "YOUR_GOOGLE_SHEETS_DOCUMENT_ID", "cachedResultUrl": "https://docs.google.com/spreadsheets/d/YOUR_GOOGLE_SHEETS_DOCUMENT_ID/edit?usp=drivesdk", "cachedResultName": "Price_History_Sheet_Template" } }, "credentials": { "googleSheetsOAuth2Api": { "name": "" } }, "typeVersion": 4.7 }, { "id": "ad0d7c05-0efd-44e6-943c-35bae37f1546", "name": "Prepare AI Data", "type": "n8n-nodes-base.code", "position": [ -752, -112 ], "parameters": { "jsCode": "// Get current price\nconst currentPriceText = $('Extract Price').first().json.price;\nconst currentPrice = parseFloat(currentPriceText.replace(/[$,]/g, ''));\n\n// Get price history (last 60 days)\nconst historyItems = $('Get Price History').all();\n\n// Sort by date descending and get last 60 entries\nconst priceHistory = historyItems\n .map(item => ({\n date: item.json.Date,\n price: parseFloat(item.json.Price)\n }))\n .sort((a, b) => new Date(b.date) - new Date(a.date))\n .slice(0, 60);\n\n// Calculate statistics\nconst prices = priceHistory.map(h => h.price);\nconst avgPrice = prices.length > 0 ? prices.reduce((a, b) => a + b, 0) / prices.length : currentPrice;\nconst minPrice = prices.length > 0 ? Math.min(...prices) : currentPrice;\nconst maxPrice = prices.length > 0 ? Math.max(...prices) : currentPrice;\n\n// Prepare data for AI\nconst last30Days = priceHistory.slice(0, 30);\nconst priceData = last30Days.map(h => `${h.date}: $${h.price.toFixed(2)}`).join('\\n');\n\nconst targetPrice = $('Get Products').first().json.Target_Price;\n\nreturn {\n current_price: currentPrice,\n target_price: targetPrice,\n avg_price_60d: avgPrice.toFixed(2),\n min_price_60d: minPrice.toFixed(2),\n max_price_60d: maxPrice.toFixed(2),\n history_length: priceHistory.length,\n price_data_text: priceData,\n full_history: priceHistory\n};" }, "typeVersion": 2 }, { "id": "9fc0ce09-8f88-499b-a322-09d761b374b6", "name": "AI Agent", "type": "@n8n/n8n-nodes-langchain.agent", "position": [ -544, -112 ], "parameters": { "text": "=Analyze this product price history and tell me if I should buy now or wait.\n\nCurrent Price: {{ $json.current_price }} \nTarget Price: {{ $json.target_price }} \nAverage (60 days): {{ $json.avg_price_60d }}\nMin (60 days): {{ $json.min_price_60d }} \nMax (60 days): {{ $json.max_price_60d }}\nPrice History (last 30 days):\n{{ $json.price_data_text }}\n\nProvide your analysis in JSON format with: recommendation, confidence, reason, urgency_score, predicted_trend.", "options": { "systemMessage": "You are a price prediction expert. Analyze price history and provide buying recommendations. Always respond in valid JSON format with these exact fields: recommendation (BUY/WAIT), confidence (0-100), reason (brief explanation), urgency_score (0-100), predicted_trend (RISING/FALLING/STABLE)." }, "promptType": "define" }, "typeVersion": 3 }, { "id": "080b40f3-e02a-4f2e-8f15-03bd8c146e72", "name": "OpenAI Chat Model", "type": "@n8n/n8n-nodes-langchain.lmChatOpenAi", "position": [ -544, 96 ], "parameters": { "model": { "__rl": true, "mode": "list", "value": "gpt-4o-mini" }, "options": {} }, "credentials": { "openAiApi": { "name": "" } }, "typeVersion": 1.2 }, { "id": "759fa1da-ac35-41b4-8ab9-759079bc259f", "name": "Parse AI Response", "type": "n8n-nodes-base.code", "position": [ -256, -112 ], "parameters": { "jsCode": "// Parse AI response\nlet aiResponse;\ntry {\n const content = $input.first().json.output || $input.first().json.text || '';\n // Try to extract JSON if wrapped in markdown\n const jsonMatch = content.match(/```json\\s*([\\s\\S]*?)```/) || content.match(/({[\\s\\S]*})/);\n const jsonStr = jsonMatch ? jsonMatch[1] : content;\n aiResponse = JSON.parse(jsonStr.trim());\n} catch (error) {\n // Fallback if parsing fails\n aiResponse = {\n recommendation: 'WAIT',\n confidence: 50,\n reason: 'Unable to parse AI response',\n urgency_score: 50,\n predicted_trend: 'STABLE'\n };\n}\n\n// Get data from Loop context\nconst loopItem = $('Loop Products').first().json;\nconst productUrl = loopItem.URL_Product;\nconst productName = loopItem.Product_Name || 'Product';\nconst userEmail = loopItem.User_Email;\nconst targetPrice = loopItem.Target_Price;\n\n// Get analysis data\nconst analysisData = $('Prepare AI Data').item.json;\nconst currentPrice = analysisData.current_price;\nconst avgPrice = analysisData.avg_price_60d;\nconst minPrice = analysisData.min_price_60d;\nconst maxPrice = analysisData.max_price_60d;\nconst priceHistory = analysisData.full_history;\n\n// Determine if should buy\nconst shouldBuy = aiResponse.recommendation === 'BUY' && currentPrice <= targetPrice;\n\n// Prepare chart data\nconst chartData = priceHistory.slice(0, 30).reverse();\nconst chartLabels = chartData.map(h => h.date);\nconst chartPrices = chartData.map(h => h.price);\n\nreturn {\n product_url: productUrl,\n product_name: productName,\n user_email: userEmail,\n current_price: currentPrice,\n target_price: targetPrice,\n avg_price: avgPrice,\n min_price: minPrice,\n max_price: maxPrice,\n ai_recommendation: aiResponse.recommendation,\n ai_confidence: aiResponse.confidence,\n ai_reason: aiResponse.reason,\n urgency_score: aiResponse.urgency_score,\n predicted_trend: aiResponse.predicted_trend,\n should_buy: shouldBuy,\n chart_labels: chartLabels,\n chart_prices: chartPrices\n};" }, "typeVersion": 2 }, { "id": "8f078b55-0694-4edc-8a4b-faddd0ee9f83", "name": "Generate Chart", "type": "n8n-nodes-base.code", "position": [ -80, -112 ], "parameters": { "jsCode": "// Generate QuickChart.io URL for price history chart\nconst labels = $json.chart_labels;\nconst prices = $json.chart_prices;\nconst currentPrice = $json.current_price;\nconst targetPrice = $json.target_price;\n\nconst chartConfig = {\n type: 'line',\n data: {\n labels: labels,\n datasets: [\n {\n label: 'Price History',\n data: prices,\n borderColor: 'rgb(75, 192, 192)',\n backgroundColor: 'rgba(75, 192, 192, 0.2)',\n tension: 0.1,\n fill: true\n },\n {\n label: 'Target Price',\n data: Array(labels.length).fill(targetPrice),\n borderColor: 'rgb(255, 99, 132)',\n borderDash: [5, 5],\n fill: false,\n pointRadius: 0\n }\n ]\n },\n options: {\n title: {\n display: true,\n text: 'Price History (Last 30 Days)'\n },\n scales: {\n yAxes: [{\n ticks: {\n callback: function(value) {\n return '$' + value.toFixed(2);\n }\n }\n }]\n }\n }\n};\n\nconst encodedConfig = encodeURIComponent(JSON.stringify(chartConfig));\nconst chartUrl = `https://quickchart.io/chart?c=${encodedConfig}&width=600&height=300`;\n\nreturn {\n ...($json),\n chart_url: chartUrl\n};" }, "typeVersion": 2 }, { "id": "80e87ac8-1be3-4eef-8e7c-e13f09868bd3", "name": "Should Buy?", "type": "n8n-nodes-base.if", "position": [ 144, -112 ], "parameters": { "options": {}, "conditions": { "options": { "version": 2, "leftValue": "", "caseSensitive": true, "typeValidation": "strict" }, "combinator": "and", "conditions": [ { "id": "should-buy-condition", "operator": { "type": "boolean", "operation": "true", "singleValue": true }, "leftValue": "={{ $json.should_buy }}", "rightValue": true } ] } }, "typeVersion": 2.2 }, { "id": "677c3ae3-52d0-4fcb-97d8-5671a176d1b2", "name": "Send Email Alert", "type": "n8n-nodes-base.gmail", "position": [ 400, -208 ], "parameters": { "sendTo": "={{ $json.user_email }}", "message": "=

Smart Price Monitor - AI Recommendation

\n\n

Product: {{ $json.product_name }}

\n\n

\ud83d\udcca Current Analysis

\n
    \n
  • Current Price: ${{ $json.current_price }}
    • \n
  • Your Target: ${{ $json.target_price }}
    • \n
  • 60-Day Average: ${{ $json.avg_price }}
    • \n
  • 60-Day Min: ${{ $json.min_price }}
    • \n
  • 60-Day Max: ${{ $json.max_price }}
    • \n
\n\n

\ud83e\udd16 AI Recommendation

\n
    \n
  • Action: {{ $json.ai_recommendation }}
    • \n
  • Confidence: {{ $json.ai_confidence }}%
    • \n
  • Urgency Score: {{ $json.urgency_score }}/100
    • \n
  • Predicted Trend: {{ $json.predicted_trend }}
    • \n
  • Reason: {{ $json.ai_reason }}
    • \n
\n\n

\ud83d\udcc8 Price History Chart

\n

\"Price

\n\n

This analysis is based on historical price data and AI prediction. Always verify current price before purchasing.

", "options": { "appendAttribution": false }, "subject": "=\ud83c\udfaf AI Recommends: {{ $json.ai_recommendation }} - {{ $json.product_name }}" }, "credentials": { "gmailOAuth2": { "name": "" } }, "typeVersion": 2.1 }, { "id": "665cad5b-6397-4427-90ab-4aae1789d93e", "name": "Update Products Sheet", "type": "n8n-nodes-base.googleSheets", "position": [ 640, -96 ], "parameters": { "columns": { "value": { "Last_Check": "={{ $now.toISO() }}", "Last_Price": "={{ $('Parse AI Response').item.json.current_price }}", "Should_Buy": "={{ $('Parse AI Response').item.json.should_buy }}", "User_Email": "={{ $('Parse AI Response').item.json.user_email }}", "row_number": 0, "URL_Product": "={{ $('Parse AI Response').item.json.product_url }}", "Product_Name": "={{ $('Parse AI Response').item.json.product_name }}", "Target_Price": "={{ $('Parse AI Response').item.json.target_price }}", "AI_Confidence": "={{ $('Parse AI Response').item.json.ai_confidence }}", "Urgency_Score": "={{ $('Parse AI Response').item.json.urgency_score }}", "Predicted_Trend": "={{ $('Parse AI Response').item.json.predicted_trend }}", "AI_Recommendation": "={{ $('Parse AI Response').item.json.ai_recommendation }}" }, "schema": [ { "id": "URL_Product", "type": "string", "display": true, "required": false, "displayName": "URL_Product", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "Product_Name", "type": "string", "display": true, "required": false, "displayName": "Product_Name", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "Target_Price", "type": "string", "display": true, "required": false, "displayName": "Target_Price", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "User_Email", "type": "string", "display": true, "required": false, "displayName": "User_Email", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "Last_Price", "type": "string", "display": true, "required": false, "displayName": "Last_Price", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "Last_Check", "type": "string", "display": true, "required": false, "displayName": "Last_Check", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "AI_Recommendation", "type": "string", "display": true, "required": false, "displayName": "AI_Recommendation", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "AI_Confidence", "type": "string", "display": true, "required": false, "displayName": "AI_Confidence", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "Urgency_Score", "type": "string", "display": true, "required": false, "displayName": "Urgency_Score", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "Predicted_Trend", "type": "string", "display": true, "required": false, "displayName": "Predicted_Trend", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "Should_Buy", "type": "string", "display": true, "required": false, "displayName": "Should_Buy", "defaultMatch": false, "canBeUsedToMatch": true }, { "id": "row_number", 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