Product research on this API is one get_growth call with a shopper phrase and a comma-separated source list. POST https://api.trendsapi.ai/api with a Bearer key. The inner object lists each source. Windows can succeed on one source and error on another. That split is the finding. Decode the string body before joining rows. Field names live on the API reference. Amazon phrase rules live on the Amazon guide.
Phrase, not ASIN
POST https://api.trendsapi.ai/api
Authorization: Bearer <api_key>
Content-Type: application/json
{"mode":"get_growth","source":"amazon, tiktok, google shopping, google search","keyword":"air fryer","percent_growth":["7D","1M","3M","12M"]}
TikTok stored the term as airfryer. The other three kept the space. Compare the search_term on each block before joining rows.
Four sources disagreed on air fryer
Four-source check on 27 Aug 2026, keyword air fryer:
| Source | 7D | 1M | 3M | 12M | Recent 0-100 |
|---|---|---|---|---|---|
google search |
−3.45% | +5.66% | −18.84% | +16.67% | 56 on 22 Aug 2026 |
google shopping |
+33.33% | +33.33% | −84.31% | +100% | 8 on 22 Aug 2026 |
tiktok |
+43.18% | +21.15% | date_out_of_range |
date_out_of_range |
37.8 on 25 Aug 2026 |
amazon |
collapsed_range |
−9.81% | +5.75% | −30.31% | 51.5 on 31 Jul 2026 |
TikTok history in this pull ran 27 Jul 2026 to 25 Aug 2026 (30 points). A 3M or 12M baseline sits outside that span. Amazon 7D collapsed. Shopping's 3M drop (8 vs 51) is a seasonal cliff, not a missing feed.
volume_weighted_growth was −1.5. Weight used three of four sources. Amazon held 42.5% of the volume total, google search 33.91%, tiktok 23.59%. Shopping had no volume in the weight.
Best-seller board is a different object
get_top_trends with type Amazon Best Sellers Top Rated has no keyword. Snapshot 2026-08-24T04:01:39Z led with Amazon Basics AA batteries, then AAA batteries, then Crocs Classic Clog. That list is what is selling as a ranked SKU title. It is not get_growth for air fryer. Do not treat rank 1 on the board as demand for the research phrase.
Seller writeups in 2026 still split the job the same way this POST does: Amazon captures typed demand, TikTok Shop creates it in video. Validate both before a PO. TikTok notes: the TikTok guide.