Playbook · Price Monitoring

Check the Amazon buy box and every seller's price for any ASIN

One API call per ASIN returns the buy box winner and every competing offer, with shipping, FBA status and the delivery date for your ZIP code.

How to do it Get a free API key

In short

Call /product-offers with the ASIN, the country and, optionally, a delivery_zipcode. main_buy_box gives the buy box seller, price and FBA status, and product_offers lists the competing offers with price, shipping, condition and seller rating.

The use case

The buy box is the offer behind Amazon's Add to Cart button. When several sellers list the same product, Amazon picks one of them, and the pick can change during the day. Tracking it tells you who is winning a listing, at what price, and what each competitor charges once shipping is added.

Who does this: Repricing tools, wholesale and arbitrage sourcing, cross-border sellers comparing Amazon's European stores, and retailers or brands watching who sells their products.

How to do it

Uses the Real-Time Amazon Data API, tested live on October 27, 2026. Call /product-offers with an ASIN, a marketplace and, optionally, a ZIP code. Here, a LEGO set with 29 sellers, priced for New York (10001):

import requests

r = requests.get(
    "https://api.openwebninja.com/realtime-amazon-data/product-offers",
    headers={"x-api-key": "YOUR_API_KEY"},
    params={"asin": "B0DRW6NF59", "country": "US", "delivery_zipcode": "10001", "limit": 100},
)
data = r.json()["data"]
print(data["delivery_zipcode"], data["main_buy_box"]["seller"], data["main_buy_box"]["price"])
for o in data["product_offers"][:5]:
    print(o["seller"], o["product_price"], "+", o["delivery_price"], "shipping")

Result

10001 Amazon.com $51.99
Amazon.com $51.99 + FREE shipping
Undiscovered Realm Inc $42.00 + $9.99 shipping
Good Gifts Online $52.92 + FREE shipping
PREM PR $61.70 + FREE shipping
Beyond Time Games Cards & Collectibles $62.91 + FREE shipping

Full response of the cURL call above · JSON

{
  "status": "OK",
  "request_id": "ca7192be-bb60-4c5b-99a6-692665994416",
  "parameters": {
    "asin": "B0DRW6NF59",
    "country": "US",
    "delivery_zipcode": "10001",
    "limit": 100,
    "page": 1,
    "language": "en_US"
  },
  "data": {
    "asin": "B0DRW6NF59",
    "product_title": "LEGO Technic Ford Bronco Kids Toy Car - Building Toy for Boys and Girls, Ages 10+ - Car Toy and Model Kit - Makes a Cool Birthday Gift for Kids - Authentic Ford Bronco Trim & Details - 42213",
    "product_item_highlight": null,
    "product_price": "51.99",
    "product_price_value": 51.99,
    "product_original_price": "$64.99",
    "product_original_price_value": 64.99,
    "unit_price_value": null,
    "unit_price_unit": null,
    "unit_count": null,
    "delivery_price": "FREE",
    "product_price_max_value": null,
    "minimum_order_quantity": null,
    "maximum_order_quantity": 20,
    "currency": "USD",
    "country": "US",
    "domain": "www.amazon.com",
    "marketplace_id": "ATVPDKIKX0DER",
    "product_byline": null,
    "product_byline_link": null,
    "product_byline_links": null,
    "brand_store_id": null,
    "product_star_rating": "4.9",
    "product_num_ratings": 1201,
    "product_url": "https://www.amazon.com/dp/B0DRW6NF59",
    "product_slug": null,
    "product_photo": "https://m.media-amazon.com/images/I/81NibTPWtiL._AC_SL1500_.jpg",
    "product_num_offers": 29,
    "product_minimum_offer_price": "$51.99",
    "product_minimum_offer_price_value": 51.99,
    "product_minimum_offer_condition": "NEW",
    "product_offers_link": "https://www.amazon.com/gp/offer-listing/B0DRW6NF59/ref=dp_olp_NEW_mbc?ie=UTF8&condition=NEW",
    "product_availability": "In Stock",
    "product_condition": "",
    "is_best_seller": false,
    "is_amazon_choice": true,
    "is_prime": true,
    "main_buy_box": {
      "price": "$51.99",
      "is_fba": true,
      "seller": "Amazon.com",
      "return_policy": "FREE 30-day refund/replacement"
    },
    "buy_boxes": [],
    "climate_pledge_friendly": false,
    "sales_volume": "2K+ bought in past month",
    "about_product": [
      "FORD BRONCO MODEL CAR KIT – Builders ages 9+ can create their own off-road adventures with this detailed LEGO Technic SUV featuring authentic mechanics",
      "AUTHENTIC DETAILS – This car toy building set includes working suspension, opening doors, functional steering, and a detailed V6 engine under the lifting hood",
      "CAR MODEL KIT – Young engineers can explore learn more about their favorite vehicles with this building and learning toy that demonstrates real suspension systems and steering mechanics",
      "ICONIC AMERICAN TOY CAR – The completed Ford Bronco features striking red and black detailing with roof rack and traction boards, perfect for room decor or adventure play",
      "GIFT IDEA FOR BOYS & GIRLS – Makes an exciting birthday or holiday present for children who love toy cars and off-road vehicles",
      "LEVEL UP YOUR BUILD – The LEGO Builder app provides an enhanced construction experience with 3D model viewing and progress tracking features",
      "DIMENSIONS – The completed 943-piece LEGO Technic Ford Bronco measures over 5 in. (13 cm) high, 11 in. (28 cm) long and 5 in. (13 cm) wide"
    ],
    "product_description": "Conquer any terrain with the LEGO Technic Ford Bronco SUV (42213), a car toy building set that brings the legendary off-road icon to life in stunning detail. Builders ages 9+ can assemble authentic features including working suspension with front and live rear axles, opening doors, and a detailed V6 engine hidden beneath the lifting hood. This hands-on STEM learning toy delivers a unique steering experience - control the SUV's direction using the functioning spare wheel mounted on the rear. The model's striking red and black color scheme is complemented by realistic touches like the roof rack with removable traction boards, perfect for imaginary wilderness expeditions. The LEGO Builder app enhances the construction journey with intuitive 3D visualization tools that let builders zoom, rotate, and track their progress. Whether displayed proudly or used for creative off-road adventures, this detailed Ford Bronco model introduces young builders to engineering concepts while delivering hours of imaginative play. Contains 943 pieces.",
    "product_information": {
      "Brand Name": "LEGO",
      "Sub Brand": "Technic",
      "Model Name": "42213",
      "Model Number": "6526833",
      "Age Range Description": "Tween (10-12 Years)",
      "Unit Count": "1 Count",
      "UPC": "673419405584",
      "Target Audience": "unisex",
      "Included Components": "LEGO Building Elements",
      "Item Type Name": "Building Kit",
      "Item Length": "11 inches",
      "Manufacturer": "LEGO",
      "Model Year": "2025",
      "Manufacturer Part Number": "6526833",
      "Best Sellers Rank": "#3,383 in Toys & Games (See Top 100 in Toys & Games)  #160 in Toy Building Sets",
      "ASIN": "B0DRW6NF59",
      "Manufacturer recommended age": "9 years and up",
      "Color": "Multicolor",
      "Theme": "LEGO",
      "Subject Character": "Ford Bronco",
      "Number of Pieces": "943",
      "Item Dimensions": "15.04 x 10.32 x 3.7 inches",
      "Item Weight": "2.5 pounds",
      "Size": "11.00 x 5.00 x 5.00 inches",
      "Educational Objective": "Concentration",
      "Additional Features": "Since 1958, LEGO bricks have met the highest industry standards, so they are consistent, compatible and connect and come apart easily every time – and it's still that way today",
      "Toy Building Block Type": "Interlocking Toy Building Block",
      "Material Type": "Plastic"
    },
    "best_sellers_rank": [
      {
        "rank": 3383,
        "category": "Toys & Games",
        "link": "https://www.amazon.com/gp/bestsellers/toys-and-games"
      },
      {
        "rank": 160,
        "category": "Toy Building Sets",
        "link": "https://www.amazon.com/gp/bestsellers/toys-and-games/166099011"
      }
    ],
    "important_information": {
      "Safety Information": "No Warning Applicable"
    },
    "rating_distribution": {
      "1": 1,
      "2": 0,
      "3": 1,
      "4": 4,
      "5": 94
    },
    "product_photos": [
      "https://m.media-amazon.com/images/I/81NibTPWtiL._AC_SL1500_.jpg",
      "https://m.media-amazon.com/images/I/81BsmaLmHzL._AC_SL1500_.jpg",
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      "https://m.media-amazon.com/images/I/81oc0jJjHNL._AC_SL1500_.jpg"
    ],
    "product_photos_labeled": [
      {
        "url": "https://m.media-amazon.com/images/I/81NibTPWtiL._AC_SL1500_.jpg",
        "variant": "MAIN"
      },
      {
        "url": "https://m.media-amazon.com/images/I/81BsmaLmHzL._AC_SL1500_.jpg",
        "variant": "PT01"
      },
      {
        "url": "https://m.media-amazon.com/images/I/81vKyPtn-LL._AC_SL1500_.jpg",
        "variant": "PT02"
      },
      {
        "url": "https://m.media-amazon.com/images/I/81a0rDdd6WL._AC_SL1500_.jpg",
        "variant": "PT03"
      },
      {
        "url": "https://m.media-amazon.com/images/I/81pHC7KcQrL._AC_SL1500_.jpg",
        "variant": "PT04"
      },
      {
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      },
      {
        "url": "https://m.media-amazon.com/images/I/81oc0jJjHNL._AC_SL1500_.jpg",
        "variant": "PT06"
      }
    ],
    "product_videos": [
      {
        "id": "amzn1.ive.vendor.video.06b693d8b7934463a8c5c4ce3af8986b",
        "title": "LEGO Technic Ford Bronco SUV 42213",
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        "thumbnail_url": "https://m.media-amazon.com/images/I/51J-YUB+M2L.SS40_BG85,85,85_BR-120_PKdp-play-icon-overlay__.jpg",
        "product_asin": "B0DRW6NF59",
        "parent_asin": "B0DRW6NF59"
      },
      {
        "id": "amzn1.ive.vendor.video.07df0e32f54a4adca51f13fd5a3ba4cf",
        "title": "LEGO Technic Ford Bronco SUV 42213 360 Spin",
        "video_url": "https://m.media-amazon.com/images/S/vse-vms-transcoding-artifact-us-east-1-prod/4dff5176-f1e9-4bfb-9d11-8a6f93078d91/default.jobtemplate.hls.m3u8",
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        "video_width": "1920",
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        "product_asin": "B0DRW6NF59",
        "parent_asin": "B0DRW6NF59"
      }
    ],
    "user_uploaded_videos": [],
    "customer_review_media": null,
    "video_thumbnail": "https://m.media-amazon.com/images/I/51J-YUB+M2L.SX522_.jpg",
    "has_video": true,
    "product_details": {},
    "customers_say": "Customers find this LEGO Technic set to be a great replica that's fun to build, with pieces fitting together without glue and taking about 3 days to complete. They appreciate its appearance, noting it looks like a typical Lego set, and consider it worth the money. Customers praise the build quality, with one mentioning it feels like a true Technic set, and find the instructions good.",
    "review_aspects": {
      "Quality": "POSITIVE",
      "Fun to build": "POSITIVE",
      "Gift": "POSITIVE",
      "Assembly": "POSITIVE",
      "Value for money": "POSITIVE",
      "Build quality": "POSITIVE",
      "Appearance": "POSITIVE",
      "Instructions": "POSITIVE"
    },
    "review_aspects_details": [
      {
        "aspect": "Quality",
        "sentiment": "POSITIVE",
        "mentions": 115,
        "positive_mentions": 111,
        "negative_mentions": 4
      },
      {
        "aspect": "Fun to build",
        "sentiment": "POSITIVE",
        "mentions": 61,
        "positive_mentions": 61,
        "negative_mentions": 0
      },
      {
        "aspect": "Gift",
        "sentiment": "POSITIVE",
        "mentions": 52,
        "positive_mentions": 52,
        "negative_mentions": 0
      },
      {
        "aspect": "Assembly",
        "sentiment": "POSITIVE",
        "mentions": 37,
        "positive_mentions": 33,
        "negative_mentions": 4
      },
      {
        "aspect": "Value for money",
        "sentiment": "POSITIVE",
        "mentions": 30,
        "positive_mentions": 27,
        "negative_mentions": 3
      },
      {
        "aspect": "Build quality",
        "sentiment": "POSITIVE",
        "mentions": 19,
        "positive_mentions": 17,
        "negative_mentions": 2
      },
      {
        "aspect": "Appearance",
        "sentiment": "POSITIVE",
        "mentions": 18,
        "positive_mentions": 18,
        "negative_mentions": 0
      },
      {
        "aspect": "Instructions",
        "sentiment": "POSITIVE",
        "mentions": 15,
        "positive_mentions": 13,
        "negative_mentions": 2
      }
    ],
    "top_reviews": [],
    "top_reviews_global": [],
    "delivery": "FREE delivery Sunday, November 1 Or Prime members get FREE delivery Today 6 PM - 11 PM. Order within 9 hrs 45 mins. Join Prime",
    "primary_delivery_time": "Sunday, November 1",
    "delivery_time": "Sunday, November 1",
    "delivery_location": "New York 10001",
    "delivery_zipcode": "10001",
    "category": {
      "id": "toys-and-games",
      "name": "Toys & Games"
    },
    "category_path": [
      {
        "id": "165793011",
        "name": "Toys & Games",
        "link": "https://www.amazon.com/toys/b/ref=dp_bc_1?ie=UTF8&node=165793011"
      },
      {
        "id": "166092011",
        "name": "Building Toys",
        "link": "https://www.amazon.com/kids-construction-blocks-models-building-sets/b/ref=dp_bc_2?ie=UTF8&node=166092011"
      },
      {
        "id": "166099011",
        "name": "Building Sets",
        "link": "https://www.amazon.com/Toy-Building-Sets/b/ref=dp_bc_3?ie=UTF8&node=166099011"
      }
    ],
    "product_variations_dimensions": [],
    "product_variations": [],
    "all_product_variations": {},
    "has_aplus": true,
    "aplus_text": "A STEM building kit to fuel creative playtimes Inspire kids to create endless off-road adventures with this detailed Ford Bronco SUV model kit. A whole world to explore There are no limits to what kids can imagine with lots of fun features inspired by the real Ford Bronco SUV. LEGO Technic Ford Bronco SUV Build the realistic details Assemble the suspension, V6 engine and live rear axle. Take control Steer the SUV using the spare wheel on the rear of the car. Ready for the journey Finishing touches include a roof rack and 2 traction boards. Enter a digital world of building Builders can zoom in, rotate sets in 3D and track progress using the fun, intuitive LEGO Builder app. A gift for car lovers This set makes a great gift idea for boys and girls or anyone who enjoys exploring and off-road vehicles.",
    "aplus_images": [
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    ],
    "has_brandstory": true,
    "frequently_bought_together": [
      {
        "asin": "B0DRW6NF59",
        "product_title": "This item:  LEGO Technic Ford Bronco Kids Toy Car - Building Toy for Boys and Girls, Ages 10+ - Car Toy and Model Kit - Makes a Cool Birthday Gift for Kids - Authentic Ford Bronco Trim & Details - 42213",
        "product_price": "$51.99",
        "product_url": "https://www.amazon.com/dp/B0DRW6NF59",
        "product_photo": "https://images-na.ssl-images-amazon.com/images/I/81NibTPWtiL.jpg"
      },
      {
        "asin": "B0FMYT1FJS",
        "product_title": "LEGO Technic Jeep Wrangler Rubicon SUV 42227 | Building Toys for Boys & Girls, Ages 10+, Model Car Kit for Display, Bedroom Decor, 723 Pieces, Gift for Birthdays",
        "product_price": "$51.99",
        "product_url": "https://www.amazon.com/dp/B0FMYT1FJS",
        "product_photo": "https://images-na.ssl-images-amazon.com/images/I/81Y0m4HEZsL.jpg"
      },
      {
        "asin": "B0CV2HGNY9",
        "product_title": "LEGO Speed Champions Mercedes-AMG G 63 & SL 63 Building Toys - Kids Pretend Play Toy Cars for Boys & Girls, Ages 10+ Years - Gifts for Christmas - 76924",
        "product_price": "$26.99",
        "product_url": "https://www.amazon.com/dp/B0CV2HGNY9",
        "product_photo": "https://images-na.ssl-images-amazon.com/images/I/81CcXqnPt2L.jpg"
      }
    ],
    "frequently_bought_together_total_price": "$130.97",
    "sponsored_products": null,
    "carousel_products": [
      {
        "asin": "B0FN3WW3Z5",
        "product_title": "BrickBling LED Lighting Compatible with Lego Technic Ford Bronco SUV Car | Light Kit Compatible with Lego 42213 - Exluding Model Car (RC Version Light)",
        "product_price": "$35.98",
        "product_original_price": "$37.98",
        "product_star_rating": "4.3",
        "product_num_ratings": 42,
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        "product_photo": "https://images-na.ssl-images-amazon.com/images/I/71K6LW9Jp1L._AC_UL165_SR165,165_.jpg",
        "badges": [
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        ],
        "carousel_title": "Related Climate Pledge Friendly items",
        "position": 1
      },
      {
        "asin": "B0FMQVMTKH",
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        "product_price": "$24.98",
        "product_original_price": null,
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        "product_num_ratings": 48,
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        ],
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        "position": 2
      },
      {
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        "product_title": "LIGHTAILING Light for Lego-42213 Ford Bronco SUV - Led Lighting Kit Compatible with Lego Building Blocks Model - NOT Included The Model Set",
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        ],
        "carousel_title": "Related Climate Pledge Friendly items",
        "position": 3
      },
      {
        "asin": "B0GRTWB7VM",
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        "product_original_price": null,
        "product_star_rating": "4.4",
        "product_num_ratings": 1772,
        "product_url": "https://www.amazon.com/dp/B0GRTWB7VM",
        "product_photo": "https://images-na.ssl-images-amazon.com/images/I/81pxbJfGz4L._AC_UL165_SR165,165_.jpg",
        "badges": [
          "3 sustainability features"
        ],
        "carousel_title": "Related Climate Pledge Friendly items",
        "position": 4
      },
      {
        "asin": "B081W8C5CJ",
        "product_title": "Ford Bronco Gray Logo T-Shirt",
        "product_price": "$22.99",
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        "badges": [
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        ],
        "carousel_title": "Related Climate Pledge Friendly items",
        "position": 5
      },
      {
        "asin": "B0FGHPNKMN",
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        "product_original_price": "$49.99",
        "product_star_rating": "4.2",
        "product_num_ratings": 126,
        "product_url": "https://www.amazon.com/dp/B0FGHPNKMN",
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        "badges": [
          "3 sustainability features"
        ],
        "carousel_title": "Related Climate Pledge Friendly items",
        "position": 6
      }
    ],
    "landing_asin": "B0DRW6NF59",
    "is_redirected": false,
    "product_offers": [
      {
        "product_price": "$51.99",
        "product_original_price": "$64.99",
        "product_condition": "New",
        "ships_from": "Amazon.com",
        "is_fba": true,
        "seller": "Amazon.com",
        "seller_id": null,
        "seller_link": null,
        "seller_star_rating": "5",
        "seller_star_rating_info": "1,201 ratings",
        "seller_num_ratings": null,
        "seller_positive_ratings_percentage": null,
        "currency": "USD",
        "delivery_price": "FREE",
        "delivery_time": "Sunday, November 1"
      },
      {
        "product_price": "$42.00",
        "product_original_price": "$64.99",
        "product_condition": "New",
        "ships_from": "Undiscovered Realm Inc",
        "is_fba": false,
        "seller": "Undiscovered Realm Inc",
        "seller_id": "A1WLF4Z48YQDD2",
        "seller_link": "https://www.amazon.com/gp/aag/main?ie=UTF8&seller=A1WLF4Z48YQDD2&isAmazonFulfilled=0&asin=B0DRW6NF59&ref_=olp_merch_name_1",
        "seller_star_rating": "4.5",
        "seller_star_rating_info": "(348 ratings)\n82% positive over last 12 months",
        "seller_num_ratings": 348,
        "seller_positive_ratings_percentage": 82,
        "currency": "USD",
        "delivery_price": "$9.99",
        "delivery_time": "Wednesday, November 4"
      },
      {
        "product_price": "$52.92",
        "product_original_price": "$64.99",
        "product_condition": "New",
        "ships_from": "Amazon.com",
        "is_fba": true,
        "seller": "Good Gifts Online",
        "seller_id": "A1C1K40LT08646",
        "seller_link": "https://www.amazon.com/gp/aag/main?ie=UTF8&seller=A1C1K40LT08646&isAmazonFulfilled=1&asin=B0DRW6NF59&ref_=olp_merch_name_2",
        "seller_star_rating": "5",
        "seller_star_rating_info": "(350 ratings)\n100% positive over last 12 months",
        "seller_num_ratings": 350,
        "seller_positive_ratings_percentage": 100,
        "currency": "USD",
        "delivery_price": "FREE",
        "delivery_time": "Sunday, November 1"
      },
      {
        "product_price": "$61.70",
        "product_original_price": "$64.99",
        "product_condition": "New",
        "ships_from": "PREM PR",
        "is_fba": false,
        "seller": "PREM PR",
        "seller_id": "A13GT99DON1NIS",
        "seller_link": "https://www.amazon.com/gp/aag/main?ie=UTF8&seller=A13GT99DON1NIS&isAmazonFulfilled=0&asin=B0DRW6NF59&ref_=olp_merch_name_3",
        "seller_star_rating": "4.5",
        "seller_star_rating_info": "(108 ratings)\n82% positive over last 12 months",
        "seller_num_ratings": 108,
        "seller_positive_ratings_percentage": 82,
        "currency": "USD",
        "delivery_price": "FREE",
        "delivery_time": "Wednesday, November 4"
      },
      {
        "product_price": "$62.91",
        "product_original_price": null,
        "product_condition": "New",
        "ships_from": "Beyond Time Games Cards & Collectibles",
        "is_fba": false,
        "seller": "Beyond Time Games Cards & Collectibles",
        "seller_id": "A36QGOO9922B20",
        "seller_link": "https://www.amazon.com/gp/aag/main?ie=UTF8&seller=A36QGOO9922B20&isAmazonFulfilled=0&asin=B0DRW6NF59&ref_=olp_merch_name_4",
        "seller_star_rating": "4",
        "seller_star_rating_info": "(1629 ratings)\n78% positive over last 12 months",
        "seller_num_ratings": 1629,
        "seller_positive_ratings_percentage": 78,
        "currency": "USD",
        "delivery_price": "FREE",
        "delivery_time": "Wednesday, November 4"
      },
      {
        "product_price": "$64.68",
        "product_original_price": null,
        "product_condition": "New",
        "ships_from": "Amazon.com",
        "is_fba": true,
        "seller": "Solati",
        "seller_id": "ACWD98WMFYZV3",
        "seller_link": "https://www.amazon.com/gp/aag/main?ie=UTF8&seller=ACWD98WMFYZV3&isAmazonFulfilled=1&asin=B0DRW6NF59&ref_=olp_merch_name_5",
        "seller_star_rating": "5",
        "seller_star_rating_info": "(2138 ratings)\n99% positive over last 12 months",
        "seller_num_ratings": 2138,
        "seller_positive_ratings_percentage": 99,
        "currency": "USD",
        "delivery_price": "FREE",
        "delivery_time": "Thursday, November 5"
      },
      {
        "product_price": "$64.68",
        "product_original_price": null,
        "product_condition": "New",
        "ships_from": "TECH61",
        "is_fba": false,
        "seller": "TECH61",
        "seller_id": "A3KO3B0FA95YGB",
        "seller_link": "https://www.amazon.com/gp/aag/main?ie=UTF8&seller=A3KO3B0FA95YGB&isAmazonFulfilled=0&asin=B0DRW6NF59&ref_=olp_merch_name_6",
        "seller_star_rating": "4.5",
        "seller_star_rating_info": "(6811 ratings)\n93% positive over last 12 months",
        "seller_num_ratings": 6811,
        "seller_positive_ratings_percentage": 93,
        "currency": "USD",
        "delivery_price": "FREE",
        "delivery_time": "Friday, October 30"
      },
      {
        "product_price": "$64.99",
        "product_original_price": null,
        "product_condition": "New",
        "ships_from": "Amazon.com",
        "is_fba": true,
        "seller": "Twin Pines Trading",
        "seller_id": "A3H1WLQEVVDDOE",
        "seller_link": "https://www.amazon.com/gp/aag/main?ie=UTF8&seller=A3H1WLQEVVDDOE&isAmazonFulfilled=1&asin=B0DRW6NF59&ref_=olp_merch_name_7",
        "seller_star_rating": "4.5",
        "seller_star_rating_info": "(971 ratings)\n95% positive over last 12 months",
        "seller_num_ratings": 971,
        "seller_positive_ratings_percentage": 95,
        "currency": "USD",
        "delivery_price": "FREE",
        "delivery_time": "Sunday, November 1"
      },
      {
        "product_price": "$64.99",
        "product_original_price": null,
        "product_condition": "New",
        "ships_from": "Amazon.com",
        "is_fba": true,
        "seller": "Thebetterbuy",
        "seller_id": "A369IFIYCGZWSM",
        "seller_link": "https://www.amazon.com/gp/aag/main?ie=UTF8&seller=A369IFIYCGZWSM&isAmazonFulfilled=1&asin=B0DRW6NF59&ref_=olp_merch_name_8",
        "seller_star_rating": "5",
        "seller_star_rating_info": "(1214 ratings)\n99% positive over last 12 months",
        "seller_num_ratings": 1214,
        "seller_positive_ratings_percentage": 99,
        "currency": "USD",
        "delivery_price": "FREE",
        "delivery_time": "Monday, November 2"
      },
      {
        "product_price": "$64.99",
        "product_original_price": null,
        "product_condition": "New",
        "ships_from": "Amazon.com",
        "is_fba": true,
        "seller": "Royal Rebel Inc",
        "seller_id": "A2QSNYYLQ5Y5DS",
        "seller_link": "https://www.amazon.com/gp/aag/main?ie=UTF8&seller=A2QSNYYLQ5Y5DS&isAmazonFulfilled=1&asin=B0DRW6NF59&ref_=olp_merch_name_9",
        "seller_star_rating": "5",
        "seller_star_rating_info": "(4155 ratings)\n99% positive over last 12 months",
        "seller_num_ratings": 4155,
        "seller_positive_ratings_percentage": 99,
        "currency": "USD",
        "delivery_price": "FREE",
        "delivery_time": "Tuesday, November 3"
      },
      {
        "product_price": "$64.95",
        "product_original_price": null,
        "product_condition": "New",
        "ships_from": "Marco's Emporium",
        "is_fba": false,
        "seller": "Marco's Emporium",
        "seller_id": "A34PILTC1Q6XT3",
        "seller_link": "https://www.amazon.com/gp/aag/main?ie=UTF8&seller=A34PILTC1Q6XT3&isAmazonFulfilled=0&asin=B0DRW6NF59&ref_=olp_merch_name_10",
        "seller_star_rating": "4.5",
        "seller_star_rating_info": "(3727 ratings)\n82% positive over last 12 months",
        "seller_num_ratings": 3727,
        "seller_positive_ratings_percentage": 82,
        "currency": "USD",
        "delivery_price": "$2.29",
        "delivery_time": "Saturday, October 31"
      }
    ]
  }
}

For a whole list

Repricers run this daily over their catalog. One row per ASIN: buy box seller and price, FBA, and the cheapest offer with shipping.

import csv
import requests

API_KEY = "YOUR_API_KEY"
URL = "https://api.openwebninja.com/realtime-amazon-data/product-offers"
ZIP = "10001"
asins = ["B0DRW6NF59", "B0DJ197M66", "B07ZPKBL9V"]

def money(s):
    # "$51.99" -> 51.99, "FREE" -> 0.0
    return 0.0 if not s or s == "FREE" else float(s.strip("$").replace(",", ""))

with open("buy_box.csv", "w", newline="") as f:
    w = csv.writer(f)
    w.writerow(["asin", "zip", "buy_box_seller", "buy_box_price", "fba",
                "cheapest_landed", "cheapest_seller", "total_offers"])
    for asin in asins:
        d = requests.get(URL, headers={"x-api-key": API_KEY}, params={
            "asin": asin, "country": "US", "delivery_zipcode": ZIP, "limit": 100,
        }, timeout=60).json().get("data") or {}
        box = d.get("main_buy_box") or {}
        offers = d.get("product_offers") or []
        landed = lambda o: money(o["product_price"]) + money(o["delivery_price"])
        cheap = min(offers, key=landed, default=None)
        w.writerow([asin, d.get("delivery_zipcode"), box.get("seller"), box.get("price"), box.get("is_fba"),
                    f"{landed(cheap):.2f}" if cheap else None,
                    cheap["seller"] if cheap else None, d.get("product_num_offers")])

buy_box.csv

asin,zip,buy_box_seller,buy_box_price,fba,cheapest_landed,cheapest_seller,total_offers
B0DRW6NF59,10001,Amazon.com,$51.99,True,51.99,Amazon.com,29
B0DJ197M66,10001,Amazon.com,$35.49,True,35.49,Amazon.com,25
B07ZPKBL9V,10001,Hybrid IT,$176.00,False,168.00,iBlueberry,23

Three ASINs took 24 seconds. For thousands of ASINs, send requests in parallel up to your plan's rate limit.

Good to know

Compare item price plus shipping. The $42.00 offer above adds $9.99 shipping, ties Amazon's $51.99, and Amazon keeps the box.
One call returns the first 11 offers (this listing has 29). In our tests the buy box offer was always among them; product_num_offers has the total.
The buy box moves. On a renewed iPhone it went from WirelessSource at $171.95 to Hybrid IT at $176.00 in one day.
Same call for 24 Amazon stores with country (DE, FR, JP...). Use limit=1 for the buy box only and product_condition=NEW to skip used offers.

Frequently asked questions

What is the Amazon buy box?

It is the offer behind the Add to Cart button on a product page: the seller a shopper buys from by default. When several sellers offer the same product, Amazon picks one of them for the buy box, and the choice can change during the day.

How can I check who holds the Amazon buy box on competitor ASINs I don't sell?

Yes. The call takes any public ASIN. You don't need a seller account or to be one of the sellers on the listing.

Can I check the buy box for the same ASIN on Amazon UK, Germany and other stores?

US, CA, MX, BR, GB, IE, DE, FR, IT, ES, NL, BE, PL, SE, TR, AE, SA, EG, ZA, IN, SG, JP, AU and CN, set with the country parameter.

Playbooks

More Price Monitoring playbooks

See all playbooks

Get today's Amazon deals filtered by discount, rating and category

One call returns 30 current Amazon deals with deal price, list price, discount and ASIN, filtered the way Amazon's deals page filters them.

APIs used:

Real-Time Amazon Data

Look up an Amazon seller and every product they sell

From a seller ID, get the seller's business name and address, rating and feedback, then page through every product they sell.

APIs used:

Real-Time Amazon Data

Get Amazon Best Sellers and New Releases for any category and country

One call returns the top 50 products of an Amazon Best Sellers or New Releases list, with rank, ASIN, price, rating and review count, for any category and store.

APIs used: