Amazon's Product Advertising API 5 is deprecated. Amazon's own register page now tells remaining callers to move to Creators API and shows a 403 AccessDeniedException for PA-API 5. Creators API still sits behind an Associates / publisher relationship. Trends API does not. source amazon on get_growth or get_time_series is search interest. Best-seller lists are separate live feeds. body is a JSON string and must be parsed a second time. Docs: the API reference. Amazon notes: the Amazon guide. Caps: pricing.
PA-API 5 is deprecated
Amazon's PA-API register document states the 5.0 API is no longer the recommended catalog path. A caller that still hits PA-API 5 should expect 403 and a migration URL. That is a catalog problem. It is not a trend-interest problem.
Creators API still needs an Associates relationship
Creators API is the supported successor for product catalog access. It is the right tool for title, image, and offer fields. It is the wrong tool for a 0-100 demand series that must sit next to TikTok in one model. Check Amazon's current signup rules if catalog is still in scope. Do not put those credentials on POST /api.
source amazon for a product phrase
POST https://api.trendsapi.ai/api
Authorization: Bearer <api_key>
Content-Type: application/json
{"mode":"get_growth","source":"amazon","keyword":"air fryer","percent_growth":["3M","12M"]}
air fryer is a labeled sample. get_time_series is the chart. Do not send a marketplace id, an associate tag, or a signed PA-API query string. The header is a Trends API Bearer key.
Best seller feeds are ranks, not search interest
{"mode":"get_top_trends","type":"Amazon Best Sellers Top Rated","limit":25}
{"mode":"get_top_trends","type":"Amazon Best Sellers by Category","category":"Home & Kitchen","limit":25}
The second type requires category. The first does not. Those rows are chart ranks. They are not the source amazon series. Keep rank history and search interest in different tables.