Unlock Competitive Advantages: Track Amazon Competitor Inventory with SellerMagnet API
In the dynamic landscape of Amazon, staying ahead requires more than just listing products. Understanding your competitors' inventory levels, pricing strategies, and sales performance is critical for informed decision-making. SellerMagnet API ( https://sellermagnet-api.com ) provides the data intelligence you need to optimize your Amazon business and gain a significant competitive edge. This blog post will guide you on how to leverage the SellerMagnet API to effectively track competitor inventory and extract actionable insights.
Why Track Competitor Inventory?
Monitoring competitor inventory offers numerous strategic benefits:
- Identify Opportunities: Spot gaps in the market when competitors run out of stock.
- Optimize Pricing: Adjust your pricing based on competitor stock levels to maximize profitability.
- Anticipate Trends: Understand demand fluctuations by observing changes in competitor inventory.
- Refine Inventory Management: Improve your forecasting and prevent stockouts or overstocking.
How SellerMagnet API Helps Track Competitor Inventory
SellerMagnet API provides access to real-time Amazon data, enabling you to monitor competitor inventory with precision. We will explore these key endpoints:
1. Amazon Product Statistics: Monitor Sales Rank and Buy Box Changes
The Amazon Product Statistics endpoint allows you to retrieve historical data on a product's sales rank and Buy Box ownership, indirectly indicating inventory levels and seller performance. Changes in sales rank can suggest fluctuations in competitor stock.
Endpoint: /amazon-product-statistics
Method: GET
Example Request (cURL):
curl --request GET \
--url 'https://sellermagnet-api.com/amazon-product-statistics?asin=B08N5WRWNW&marketplaceId=A1PA6795UKMFR9&api_key=YOUR_API_KEY'
Example Response:
{
"success": true,
"data": {
"asin": "B0CLTBHXWQ",
"productTitle": "Playstation 5 Console Edizione Digital Slim",
"buyBoxPrice": 41800,
"buyBoxFulfillment": "FBM",
"buyBoxSellerIdHistory": [
[
"2025-06-14 17:08:00",
"A2I59UVTUWUFH0"
]
],
"categoryTree": [
{
"catId": 412603031,
"name": "Videogiochi"
},
{
"catId": 20904349031,
"name": "PlayStation 5"
},
{
"catId": 20904364031,
"name": "Console"
}
],
"graphs": {
"amazonAsSellerPriceHistory": "https://sellermagnet-api-webspace.s3.eu-central-1.amazonaws.com/amazon/api/charts/B0CLTBHXWQ/1749913774/B0CLTBHXWQ_amazon_price_1749913773.png",
"lowestFBAPriceHistory": "https://sellermagnet-api-webspace.s3.eu-central-1.amazonaws.com/amazon/api/charts/B0CLTBHXWQ/1749913776/B0CLTBHXWQ_fba_price_1749913773.png",
"lowestFBMPriceHistory": "https://sellermagnet-api-webspace.s3.eu-central-1.amazonaws.com/amazon/api/charts/B0CLTBHXWQ/1749913775/B0CLTBHXWQ_fbm_price_1749913773.png",
"monthlySoldHistory": "https://sellermagnet-api-webspace.s3.eu-central-1.amazonaws.com/amazon/api/charts/B0CLTBHXWQ/1749913778/B0CLTBHXWQ_monthly_sold_1749913773.png",
"productRatingHistory": "https://sellermagnet-api-webspace.s3.eu-central-1.amazonaws.com/amazon/api/charts/B0CLTBHXWQ/1749913777/B0CLTBHXWQ_rating_1749913773.png"
},
"listedSince": "2023-12-30 01:00:00",
"lowestFBAPrice": 44999,
"lowestFBMPrice": 41700,
"marketplaceId": "APJ6JRA9NG5V4",
"marketplaceNewPriceHistory": [
[
"2025-06-14",
41700
]
],
"offers": {
"A11IL2PNWYJU7H": {
"isFBA": true,
"lastUpdated": "2025-06-14 17:08:00",
"priceHistory": [
[
"2025-06-14 06:22:00",
44999,
0
]
],
"stockHistory": [
[
"2025-05-29 11:32:00",
1
]
]
},
"A12FLY25DT7QO0": {
"isFBA": false,
"lastUpdated": "2025-06-14 17:08:00",
"priceHistory": [
[
"2025-06-09 15:32:00",
41800,
0
]
],
"stockHistory": [
[
"2025-06-14 13:34:00",
49
]
]
},
"A18KSDUE00UP6J": {
"isFBA": false,
"lastUpdated": "2025-06-14 17:08:00",
"priceHistory": [
[
"2025-05-29 11:32:00",
42890,
0
]
],
"stockHistory": [
[
"2025-05-30 18:30:00",
3
]
]
}
},
"productReviewAverage": 4.7,
"productTotalReviews": 3129,
"rootCategory": {
"id": 412603031,
"name": "Videogiochi"
},
"stats": {
"amazonAsSellerPriceHistory": [
[
"2025-06-14",
44999
]
],
"buyBoxPriceHistory": [
[
"2025-06-13",
41700
]
],
"monthlySoldHistory": [
[
"2025-06",
1000
]
],
"productRatingCountHistory": [
[
"2025-06-14 15:28:00",
3129
]
],
"productRatingHistory": [
[
"2025-02-02 01:30:00",
4.7
]
],
"salesRankHistory": [
[
"2025-06-14 01:58:00",
15
]
]
}
}
}
By analyzing the salesRankHistory and buyBoxSellerIdHistory, you can infer changes in competitor inventory levels. A sudden drop in sales rank or a shift in Buy Box ownership might suggest that a competitor is running low on stock.
2. Amazon Product Offers: Get Insights into Inventory and Seller Details
The Amazon Product Offers endpoint provides a detailed list of offers for a specific product, including inventory information, seller details, and pricing. This is invaluable for direct inventory tracking.
Endpoint: /amazon-product-offers
Method: GET
Example Request (cURL):
curl --request GET \
--url 'https://sellermagnet-api.com/amazon-product-offers?asin=B08N5WRWNW&marketplaceId=A1PA6795UKMFR9&api_key=YOUR_API_KEY'
Example Response:
{
"data": {
"asin": "B0CL61F39H",
"buyBox": {
"condition": "New",
"deliveryDate": "2025-06-28",
"fulfillmentType": "FBA",
"inventory": 30,
"positivePercentage": 0,
"priceWithoutShipping": 499,
"sellerId": "Amazon",
"sellerName": "Amazon",
"shippingPrice": 0,
"totalPrice": 499,
"totalReviews": 0
},
"currency": {
"code": "USD",
"name": "United States Dollar",
"symbol": "$"
},
"marketplaceId": "ATVPDKIKX0DER",
"offers": [
{
"condition": "New",
"deliveryDate": "2025-06-28",
"fulfillmentType": "FBA",
"inventory": 30,
"positivePercentage": 0,
"priceWithoutShipping": 499,
"sellerId": "Amazon",
"sellerName": "Amazon",
"shippingPrice": 0,
"totalPrice": 499,
"totalReviews": 0
},
{
"condition": "Used - Very Good",
"deliveryDate": "2025-07-07",
"fulfillmentType": "FBM",
"inventory": 10,
"positivePercentage": 78,
"priceWithoutShipping": 409.99,
"sellerId": "A17J18A7XABQI9",
"sellerName": "PRICE 2 SAVE",
"shippingPrice": 0,
"totalPrice": 409.99,
"totalReviews": 6892
},
{
"condition": "Used - Good",
"deliveryDate": "2025-06-26",
"fulfillmentType": "FBM",
"inventory": 1,
"positivePercentage": 87,
"priceWithoutShipping": 409.99,
"sellerId": "A1YU28SVL05CUG",
"sellerName": "premier liquidation",
"shippingPrice": 9.84,
"totalPrice": 419.83,
"totalReviews": 1177
},
{
"condition": "Used - Very Good",
"deliveryDate": "2025-06-30",
"fulfillmentType": "FBM",
"inventory": 1,
"positivePercentage": 40,
"priceWithoutShipping": 418.99,
"sellerId": "A2NBVGK6C0HCUA",
"sellerName": "Fix N Plug",
"shippingPrice": 3.99,
"totalPrice": 422.98,
"totalReviews": 30
},
{
"condition": "Used - Good",
"deliveryDate": "2025-06-30",
"fulfillmentType": "FBM",
"inventory": 1,
"positivePercentage": 94,
"priceWithoutShipping": 423.99,
"sellerId": "AZZMAGMBAQU46",
"sellerName": "VG1shop (Serial # Recorded)",
"shippingPrice": 3.99,
"totalPrice": 427.98,
"totalReviews": 163
},
{
"condition": "Used - Acceptable",
"deliveryDate": "2025-06-28",
"fulfillmentType": "FBM",
"inventory": 1,
"positivePercentage": 0,
"priceWithoutShipping": 433.85,
"sellerId": "Amazon",
"sellerName": "Amazon Resale",
"shippingPrice": 0,
"totalPrice": 433.85,
"totalReviews": 0
},
{
"condition": "Used - Very Good",
"deliveryDate": "2025-07-01",
"fulfillmentType": "FBM",
"inventory": 1,
"positivePercentage": 73,
"priceWithoutShipping": 419.99,
"sellerId": "AO9EU0V84CET9",
"sellerName": "StarEdge Electronics",
"shippingPrice": 15.75,
"totalPrice": 435.74,
"totalReviews": 154
},
{
"condition": "Used - Very Good",
"deliveryDate": "2025-06-27",
"fulfillmentType": "FBM",
"inventory": 2,
"positivePercentage": 74,
"priceWithoutShipping": 441.49,
"sellerId": "A2E7NH3SLWCOH4",
"sellerName": "Tech for Less",
"shippingPrice": 0,
"totalPrice": 441.49,
"totalReviews": 56746
},
{
"condition": "Used - Very Good",
"deliveryDate": "2025-06-27",
"fulfillmentType": "FBM",
"inventory": 1,
"positivePercentage": 84,
"priceWithoutShipping": 443.7,
"sellerId": "A3JEKQLX9Y2C9L",
"sellerName": "SaveCentral",
"shippingPrice": 0,
"totalPrice": 443.7,
"totalReviews": 7483
},
{
"condition": "Used - Like New",
"deliveryDate": "2025-06-27",
"fulfillmentType": "FBM",
"inventory": 2,
"positivePercentage": 80,
"priceWithoutShipping": 439.99,
"sellerId": "A1KOYPV53GXGUI",
"sellerName": "JRS GAMES",
"shippingPrice": 3.99,
"totalPrice": 443.98,
"totalReviews": 81
},
{
"condition": "Used - Very Good",
"deliveryDate": "2025-06-28",
"fulfillmentType": "FBA",
"inventory": 8,
"positivePercentage": 82,
"priceWithoutShipping": 444.99,
"sellerId": "A3853PJW50SJG8",
"sellerName": "Wardyga Management Services LLC",
"shippingPrice": 0,
"totalPrice": 444.99,
"totalReviews": 60
}
],
"productLink": "https://www.amazon.com/dp/B0CL61F39H",
"productMainImage": "https://m.media-amazon.com/images/I/31kTNmpm6vL.jpg",
"productTitle": "PlayStation\u00ae5 console (slim)"
},
"success": true
}
The offers array contains a list of sellers and their corresponding inventory. You can track the inventory field to monitor stock levels. By periodically querying this endpoint, you can observe changes in inventory and identify when competitors are running low on stock.
3. Amazon Product Lookup: Identify Key Product Details
The Amazon Product Lookup endpoint provides comprehensive product information, including sales rank, best seller rank and variations. It allows you to gather critical context for inventory tracking.
Endpoint: /amazon-product-lookup
Method: GET
Example Request (cURL):
curl --request GET \
--url 'https://sellermagnet-api.com/amazon-product-lookup?asin=B08N5WRWNW&marketplaceId=A1PA6795UKMFR9&api_key=YOUR_API_KEY'
Example Response:
{
"data": {
"productInfo": {
"additionalDetails": {
"ASIN": "B0CL61F39H",
"Batteries": "1 Lithium Ion batteries required. (included)",
"Best Sellers Rank": "Nr. 31 in Video Games Nr. 1 in PlayStation 5 Consoles",
"Customer Rating": "4.7 out of 5 stars",
"Date First Available": "December 10, 2023",
"Item Weight": "10.6 pounds",
"Item model number": "CFI-2015",
"Manufacturer": "Sony",
"Number of Reviews": "7,092 ratings",
"Product Dimensions": "14 x 17 x 7 inches; 10.6 Pounds",
"Release date": "December 10, 2023",
"Type of item": "Video Game"
},
"asin": "B0CL61F39H",
"bestsellerRanks": {
"main_category": {
"name": "Video Games",
"rank": 31
},
"subcategory": {
"name": "PlayStation",
"rank": 1
}
},
"bulletPoints": [
"Model Number CFI-2000",
"Includes DualSense Wireless Controller, 1TB SSD, Disc Drive, 2 Horizontal Stand Feet, HDMI Cable, AC power cord, USB cable, printed materials, ASTRO\u2019s PLAYROOM (Pre-installed game)",
"Vertical Stand sold separately"
],
"buyBoxInfo": {
"currencyCode": "USD",
"currencyName": "United States Dollar",
"currencySymbol": "$",
"price": 444.99,
"sellerId": "A3853PJW50SJG8"
},
"categories": {
"bestsellerCategory": [
{
"id": "20972781011",
"index": 1,
"name": "PlayStation 5",
"url": "https://www.amazon.com/b/ref=dp_bc_2?ie=UTF8&node=20972781011"
},
{
"id": "20972796011",
"index": 2,
"name": "Consoles",
"url": "https://www.amazon.com/b/ref=dp_bc_3?ie=UTF8&node=20972796011"
}
],
"rootCategory": {
"id": "468642",
"name": "Video Games",
"url": "https://www.amazon.com/computer-video-games-hardware-accessories/b/ref=dp_bc_1?ie=UTF8&node=468642"
}
},
"description": [
"Model Number CFI-2000",
"Includes DualSense Wireless Controller, 1TB SSD, Disc Drive, 2 Horizontal Stand Feet, HDMI Cable, AC power cord, USB cable, printed materials, ASTRO\u2019s PLAYROOM (Pre-installed game)",
"Vertical Stand sold separately",
"The PS5 console unleashes new gaming possibilities that you never anticipated. Experience lightning fast loading with an ultra-high speed SSD, deeper immersion with support for haptic feedback, adaptive triggers, and 3D Audio*, and an all-new generation of incredible PlayStation games. Lightning Speed - Harness the power of a custom CPU, GPU, and SSD with Integrated I/O that rewrite the rules of what a PlayStation console can do. Stunning Games - Marvel at incredible graphics and experience new PS5 features. Play a back catalog of supported PS4 games. Breathtaking Immersion - Discover a deeper gaming experience with support for haptic feedback, adaptive triggers, and 3D Audio technology. Vertical stand sold separately. *3D audio via built-in TV speakers or analog/USB stereo headphones. Set up and latest system software update required."
],
"details": {
"ASIN": "B0CL61F39H",
"Batteries": "1 Lithium Ion batteries required. (included)",
"Date First Available": "December 10, 2023",
"Item Weight": "10.6 pounds",
"Item model number": "CFI-2015",
"Manufacturer": "Sony",
"Platform": "PlayStation 5",
"Product Dimensions": "14 x 17 x 7 inches; 10.6 Pounds",
"Release date": "December 10, 2023",
"Type of item": "Video Game"
},
"hasAPlusContent": true,
"images": [
"https://m.media-amazon.com/images/I/41ECK5cY-2L._SL1000_.jpg",
"https://m.media-amazon.com/images/I/41srF-iY93L._SL1000_.jpg",
"https://m.media-amazon.com/images/I/41tVr19I3zL._SL1000_.jpg",
"https://m.media-amazon.com/images/I/41HMaO9jO3L._SL1000_.jpg",
"https://m.media-amazon.com/images/I/61e8hPmeoYL._SL1000_.jpg",
"https://m.media-amazon.com/images/I/61Gj1Kc5R5L._SL1000_.jpg",
"https://m.media-amazon.com/images/I/61r6PutKGwL._SL1000_.jpg",
"https://m.media-amazon.com/images/I/717Id5h1fhL._SL1000_.jpg"
],
"link": "https://www.amazon.com/dp/B0CL61F39H",
"listedSinceDate": "2023-12-10",
"mainImage": "https://m.media-amazon.com/images/I/31kTNmpm6vL.jpg",
"marketplaceId": "ATVPDKIKX0DER",
"reviews": {
"averageRating": 4.7,
"reviewSummary": "4.7 out of 5 stars",
"totalReviews": 7092
},
"title": "PlayStation\u00ae5 console (slim)",
"variations": [
{
"asin": "B0F6968Y5G",
"attributes": {
"Pattern Name": "PS5 w/ Black Ops Bundle",
"Style": "PlayStation\u00ae5 Digital Edition (slim)"
}
},
{
"asin": "B0CL5KNB9M",
"attributes": {
"Pattern Name": "PS5 Only",
"Style": "PlayStation\u00ae5 Digital Edition (slim)"
}
},
{
"asin": "B0CL61F39H",
"attributes": {
"Pattern Name": "PS5 Only",
"Style": "PlayStation\u00ae5 console (slim)"
}
},
{
"asin": "B0F691TJTP",
"attributes": {
"Pattern Name": "PS5 w/ Black Ops Bundle",
"Style": "PlayStation\u00ae5 console (slim)"
}
},
{
"asin": "B0FD54CGQ8",
"attributes": {
"Pattern Name": "PS5 w/ $100 PlayStation Store GC",
"Style": "PlayStation\u00ae5 Digital Edition (slim)"
}
},
{
"asin": "B0FD4WGVH5",
"attributes": {
"Pattern Name": "PS5 w/ $100 PlayStation Store GC",
"Style": "PlayStation\u00ae5 console (slim)"
}
}
],
"videos": [
"https://m.media-amazon.com/S/vse-vms-transcoding-artifact-us-east-1-prod/8af0ddf1-55f5-4e71-9463-39602c3edbae/default.jobtemplate.hls.m3u8",
"https://m.media-amazon.com/S/vse-vms-transcoding-artifact-us-east-1-prod/50938d5c-2a9b-427a-b766-21b7cd63502e/default.jobtemplate.hls.m3u8"
]
}
},
"success": true
}
The bestsellerRanks field can provide insights into a product's popularity, which can be correlated with inventory data from other endpoints to make informed assessments.
Practical Use Cases
- Identifying Restocking Opportunities: Monitor competitor inventory for products in high demand. When their stock decreases, increase your inventory to capture sales.
- Optimizing Advertising Spend: Adjust your advertising campaigns based on competitor stock levels. Increase ad spend when competitors are low on stock to boost visibility.
- Negotiating Better Supplier Terms: Use data on competitor inventory and sales to negotiate better terms with your suppliers, securing more favorable pricing and delivery schedules.
Implementing a Monitoring Strategy
To effectively track competitor inventory, consider the following steps:
- Identify Key Competitors: Determine which competitors you want to monitor based on product overlap and market share.
- Select Target Products: Choose the specific products you want to track.
- Set Up API Monitoring: Use SellerMagnet API to retrieve inventory and sales data regularly. Consider using DataPipeline to automate this process.
- Analyze the Data: Look for patterns and trends in the data. Identify when competitors are running low on stock or experiencing fluctuations in sales rank.
- Take Action: Adjust your pricing, inventory, and marketing strategies based on your findings.
Leverage SellerMagnet API for a Competitive Edge
SellerMagnet API ( https://sellermagnet-api.com ) empowers businesses to gain a competitive advantage by providing access to real-time Amazon data. By tracking competitor inventory, you can make data-driven decisions that improve your profitability and market share.
Ready to get started? Try Free and experience the power of SellerMagnet API.