Trendster: Amazon BSR & Price Trend Analysis for EU Sellers
Compare BSR and price history for up to 5 ASINs side-by-side, with trend direction, volatility, and seasonality flags.
Last updated: 2026-04-28
What Trendster does
- Side-by-side BSR + price history for up to 5 ASINs over 7-365 days
- Trend direction (up / down / stable) with % change start-to-end
- Volatility classification (low / medium / high) per metric
- Seasonality flags (e.g. 'Q4 peak detected') from historical data
- Works on amazon.de, .fr, .it, .es, .co.uk, .com, .ca, .com.au, .co.jp
When sellers reach for Trendster
- Confirm a category isn't seasonal-only before sourcing inventory
- Spot price-war volatility before launching against an incumbent
- Compare your own ASIN to two competitors over the last 90 days
- Decide whether a 'BSR spike' is real momentum or a single-day blip
How it works
- Paste up to 5 ASINs and pick a marketplace
- Choose a window (7-365 days) — 90 days is the default sweet spot
- Trendster pulls historical BSR + price history and computes trend direction, volatility, and seasonality per ASIN
- Read the side-by-side chart and decide whether to drill into any single ASIN with the ASIN Analyzer
Plans & allowances
| Plan | Trendster allowance |
|---|---|
| Trial | 14-day free trial on every plan, card required, cancel anytime |
| Solo ($29/mo) | 100 Trendster runs per day, full 7-365 day window |
| Starter ($79/mo) | 500 Trendster runs per day, unlimited AI Copilot for trend interpretation |
| Growth ($149/mo) | 1,000 Trendster runs per day, 5 seats, API access on request |
See the full pricing page for what each plan includes across the rest of AgentXray.
Comparable tools
| Tool | Price | EU focus |
|---|---|---|
| historical market data (charts only) | $19/mo | Best raw BSR/price history; no trend interpretation, no AI |
| Helium 10 Trendster | $129/mo (Platinum) | Bundled with Helium 10 Platinum; USD billing |
| CamelCamelCamel | Free | US/UK Amazon only; one ASIN at a time |
Inside Trendster
Frequently asked questions
- Why use Trendster when I already pay for historical market data?
- historical market data shows the raw chart; Trendster classifies it. For each ASIN you get trend direction (up/down/stable), volatility (low/medium/high), and a seasonality flag computed across the window. Useful when you're comparing 5 candidates and don't want to eyeball five historical market data charts. AgentXray uses historical market data under the hood, so the underlying data is the same.
- How many days of history can I look at?
- Anywhere from 7 to 365 days. The default is 90 days, which is the standard window EU sellers use to validate that a product isn't a one-month spike. The free tier is capped at 90 days; Starter and above unlock the full 365-day window.
- How is the volatility classification computed?
- We compute the coefficient of variation (standard deviation / mean) on the BSR and price series. A BSR coefficient under 0.2 is 'low' volatility, 0.2-0.5 is 'medium', above 0.5 is 'high'. High volatility on price typically signals an active price war or promotional churn — useful before you commit inventory.
- Does Trendster spot Q4 / seasonal peaks?
- Yes. If the 365-day window contains a clear October-December BSR improvement followed by a January regression, Trendster flags it as 'Q4 peak detected' so you don't mistake seasonal demand for year-round momentum.
- How does Trendster differ from Helium 10's Trendster?
- Helium 10's Trendster is a Google-Trends-style keyword-popularity chart bundled into Platinum. AgentXray's Trendster is product-level (ASIN BSR + price history), standalone, and priced from $29/mo when it returns. They answer different questions.
Glossary terms covered
Currently paused. The third-party market-data subscription behind this tool was cancelled in July 2026, so its endpoints return an explanatory 503 rather than empty results. The page is kept so the state is discoverable. See what is live.