Yes, the free plan costs $0 per month, requires no credit card, and covers up to 50 products with daily price checks.

How does the credit system work?

Each price check of one product uses 1 credit. A product checked once a day uses roughly 30 credits per month. Failed checks where Amazon does not return a result are refunded automatically.

Which Amazon marketplaces does Asin support?

Asin tracks products on 11 Amazon stores: amazon.com, amazon.co.uk, amazon.de, amazon.fr, amazon.it, amazon.es, amazon.ca, amazon.co.jp, amazon.com.br, amazon.com.mx, and amazon.in. Prices are shown in each store's local currency.

What plans are available and what do they cost?

Free is $0 per month with 1,500 credits and daily checks. Starter is $9 per month with 30,000 credits and checks up to every hour. Pro is $25 per month with 300,000 credits and checks up to every 30 minutes. Business is $69 per month with 1,000,000 credits and checks up to every 5 minutes. One-time credit packs at $15, $42, and $119 are also available and stay valid for 6 months.

Does Asin offer an API?

Yes, the REST API and MCP server are included on Starter, Pro, and Business plans. The MCP server lets users query their watchlist and track products directly from Claude, ChatGPT, or Cursor.

What happens when I run out of credits?

Checks pause and nothing extra is charged. Your price history stays intact and checks resume automatically when your monthly allowance refills or you add a credit pack.

Asin: Amazon price tracker with drop alerts

What is Asin?

Asin is an Amazon price tracker that watches products across 11 Amazon marketplaces and sends email alerts when a price drops, reaches a target, or a product returns to stock. Users add products by pasting an Amazon link or ASIN, choose how often the product is checked (daily up to every 5 minutes depending on the plan), and let Asin keep the full price history including coupons, stock status, and seller changes. It serves shoppers looking for deals, sellers monitoring competitor prices, and brands keeping watch on their own listings.

Why Asin works

Checking Amazon prices manually means refreshing product pages and hoping the deal appears at the right moment, while sellers and brands have no reliable way to know when a competitor changes price or a listing goes out of stock. Asin runs checks automatically on a schedule and keeps every result so users can see whether a current price is genuinely low compared to its history, then sends a targeted email only when the specific condition they set is met.

Asin features

Price history chart. Records every check and displays lowest price, highest price, out-of-stock periods, coupons, and seller changes on a single chart covering 7 days to a year of history, so users can judge whether today's listed price is actually a deal.
Configurable price alerts. Sends an email when any of three conditions are met: any price drop, a user-defined target price reached, or a product back in stock, with each condition set per product rather than globally.
Multi-marketplace tracking. Tracks the same ASIN across up to 11 Amazon stores including amazon.com, amazon.co.uk, amazon.de, amazon.fr, amazon.it, amazon.es, amazon.ca, amazon.co.jp, amazon.com.br, amazon.com.mx, and amazon.in, with prices displayed in local currency.
Chrome extension. Adds a panel to Amazon product pages showing current, lowest, and highest price without leaving the page, and lets users add a product to their watchlist or set a target price in one click.
REST API and MCP server. Gives developers and AI assistant users programmatic access to their watchlist so price data can be pulled into spreadsheets, scripts, Claude, or ChatGPT using a single API key.
Credit-based billing. Charges 1 credit per price check, refunds credits when Amazon does not return a valid result, and applies no per-seat or per-user fee.

Who Asin is for

Online shoppers who track specific products and want an email the moment the price drops or hits a personal target, without repeatedly visiting the product page.
Amazon sellers who need to monitor competitor prices, coupon activity, changes in who holds the offer, and Best Sellers Rank on a schedule tighter than daily.
Brand owners and agencies responsible for MAP compliance who want alerts when a listing price falls below the minimum advertised price or an unexpected seller appears.
Developers and data teams who need Amazon price history delivered via REST API or pulled directly into AI workflows through the MCP server.
Bargain hunters and deal researchers who want to verify whether a sale price is genuinely low by comparing it against months of recorded price history.

Similar micro SaaS ideas you can build

Amazon MAP violation monitor. Target: brand managers at consumer goods companies. Workflow: ingest a catalog of ASINs, check prices on each marketplace on a set schedule, and generate a daily report of any listing priced below the minimum advertised price. They pay to enforce pricing policy without manually checking each storefront.
Competitor price change digest. Target: e-commerce sellers on Amazon. Workflow: track a list of competitor ASINs, detect price or coupon changes at each check, and deliver a morning digest summarizing moves from the previous 24 hours. They pay to react to competitor pricing faster than weekly manual reviews.
Stock availability notifier for limited products. Target: collectors and buyers of high-demand or frequently out-of-stock items. Workflow: watch a set of ASINs for stock status changes and send a alert within minutes of a product returning to stock. They pay to avoid missing restocks on products that sell out quickly.
Amazon price history API for deal sites. Target: deal aggregator and coupon site operators. Workflow: expose a lightweight API that returns price history, current price, and lowest recorded price for any ASIN so deal pages can display context alongside affiliate links. They pay for a reliable data layer without scraping Amazon directly.