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ASIN402 Amazon ASIN Price & Stock Watcher
x402
ASIN402 Amazon ASIN Price & Stock Watcher is a paid API for AI agents from asin402.com, paid per call via x402, $0.168/call, status unknown (last checked 2026-10-31).
Sets up a scheduled monitoring job that checks 1-50 Amazon ASINs for price, buy box, and stock changes at a configured interval, returning a watch key to poll for change events.
Price / call$0.168
Success—
StatusUnknown
How this service works
Watch Amazon ASINs: scheduled price, buy box and stock checks with change alerts. Pay once to monitor 1-50 ASINs every 1h, 3h, 6h, 12h or 24h for 1-30 days. Each check records buy box, Amazon, lowest new/used price, stock, buy box seller, offer count, sales rank and rating, and logs changes as events (price drops/rises, out of stock, back in stock, buy box seller change, below your target price). Poll the free status URL with your watch key to read new events. The first check runs immediately. P
Output
Returns a JSON object containing a watch_id, a free status_url to poll for events, a watch key, the number of checks planned, the next check timestamp, the marketplace, interval, days, price paid, and the current snapshot of all tracked ASINs (buy box price, Amazon price, lowest new/used prices, stock status, offer count, sales rank). Change events (price drops/rises, stock changes, buy box seller changes, target price breaches) are logged and available via polling the status URL.
Example use cases
Deal hunter target price alert
“Set up a price watch for ASIN B08N5WRWNW on Amazon US — check every 3 hours for 14 days and alert me when the price drops below $35, ignoring moves smaller than 2%.”
Reseller buy box monitoring
“I need to monitor ASINs B07XJ8C8F5 and B09B8RNKL6 on the UK Amazon marketplace every 1 hour for 5 days to track buy box seller changes and out-of-stock events.”
FBA competitor stock tracking
“Watch these 5 ASINs — B08F7N3T6X, B07T8JQHCL, B09KMPL4NB, B08XLNZFZF, B07WFPM9S8 — on Amazon Germany every 12 hours for 30 days, and let me know whenever any of them go out of stock or come back in stock.”
Technical details
Endpoint
GEThttps://asin402.com/api/watch?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need ongoing, scheduled surveillance of Amazon product prices, stock, and buy box changes over days or weeks rather than a one-time snapshot. It is ideal when you want change-event alerts (price drop, out of stock, buy box seller change, below target price) across 1-50 ASINs with configurable frequency (1h to 24h). Prefer it over one-time price lookup endpoints when you need historical change logging or automated deal detection without building your own polling infrastructure.
Side effects
- Invalid or non-existent ASINs return no data for those items
- More than 50 ASINs in a single call rejected
- Unsupported marketplace code returns error
- Interval or days value outside allowed range returns validation error
- Payment failure via x402 protocol halts watch creation
- Status URL must be polled manually — no push/webhook delivery
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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