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ASIN402 Deal Check
x402
ASIN402 Deal Check is a paid API for AI agents from asin402.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-31).
Checks whether an Amazon product's current price is a good deal by comparing it against its 30/90/180-day price history and returning a buy verdict with reasoning.
Price / call$0.02
Success—
StatusUnknown
How this service works
Is this Amazon price a good deal? Buy now or wait. Price check against history for any ASIN: compares today's price with its 30/90/180-day averages and typical 180-day range (fake-low outlier offers filtered out) and returns a verdict (buy_now, fair_price, wait or verify_offer) with a one-line reason. Use before buying or recommending a product. Amazon price tracker / price drop check. 11 marketplaces. Free sample: /api/sample/deal-check
Output
Returns a JSON object with the product title, current price, 30/90/180-day average prices, 180-day median, typical low and high for the 180-day window, percentage difference vs the 90-day average, a verdict string (buy_now, fair_price, wait, or verify_offer), a one-line reason explaining the verdict, the marketplace, currency, and a data timestamp.
Example use cases
Pre-purchase deal validation
“Before I buy this item on Amazon — ASIN 0735211299 — can you check if the current price is actually a good deal compared to its historical prices, or if I should wait?”
Gift recommendation price check
“I'm thinking of recommending ASIN B08L5TNJHK on Amazon UK as a gift — is today's price near a historical low or is it overpriced right now?”
Affiliate or reseller deal verification
“I want to promote this Amazon product ASIN B07XJ8C8F5 in Germany — check if the current price is at a fair level or if buyers should hold off, and tell me the verdict with the reason.”
Technical details
Endpoint
GEThttps://asin402.com/api/deal-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, opinionated verdict on whether an Amazon price is worth acting on now versus waiting. It is purpose-built for deal validation with fake-low outlier filtering and structured verdicts, making it superior to raw price-history lookups when you want an actionable recommendation rather than raw data. Prefer this over generic price trackers when you need a single call that returns both historical context and a clear buy/wait signal across 11 Amazon marketplaces.
Side effects
- Invalid or non-existent ASIN returns an error or empty result
- Insufficient price history for a newly listed product may limit verdict accuracy
- Unsupported marketplace code returns an error
- Fake-low outlier offers are filtered but edge cases may still affect averages
- Product with no recent buy-box price may return null for current_price
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"asin": "0735211299",
"title": "Atomic Habits: An Easy & Proven Way to Build Good Habits & Break Bad Ones",
"reason": "Price is at or near the low end of its usual range.",
"avg_30d": 26.5,
"avg_90d": 28.99,
"verdict": "buy_now",
"avg_180d": 29.5,
"currency": "USD",
"data_as_of": "2026-10-26T18:40:00.000Z",
"marketplace": "us",
"median_180d": 29.5,
"price_basis": "buy_box",
"current_price": 24.99,
"typical_low_180d": 25.5,
"typical_high_180d": 29.5,
"percent_vs_90d_avg": -13.8
}
}Tags
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