Reporting API, Marketing Stream or AMC?

Which job, which product?

Job	Product
Daily campaign reporting in your own dashboard	Reporting API (v3)
Adjust bids by time of day (dayparting)	Amazon Marketing Stream
Get notified when a budget is almost used up	Amazon Marketing Stream
Which channels and paths led to the purchase?	Amazon Marketing Cloud (AMC)
Activate cart abandoners as an audience	Amazon Marketing Cloud (AMC)
Measure the overlap of DSP and sponsored ads reach	Amazon Marketing Cloud (AMC)

Axis	Reporting API (v3)	Amazon Marketing Stream	Amazon Marketing Cloud (AMC)
Granularity	Daily and summary reports per campaign, ad group, ad, keyword or target.	Traffic and conversion data summarised hourly, sent as changes (deltas) rather than snapshots.	Pseudonymised event-level signals, analysed with SQL; results come back aggregated.
Delivery	Pull: request a report via the API and download it as gzipped JSON.	Push into your own AWS account: Amazon Data Firehose or SQS, in near real time.	Your own queries in a clean-room instance; audiences go directly to DSP or sponsored ads.
Data	Aggregated performance metrics of your own campaigns.	Reporting data plus messages on budget consumption and changes to campaigns, ad groups, ads and targets.	Ad exposures and conversions across channels, your own uploaded data, optionally paid features.
Best for	Standard reporting and dashboards on a daily basis.	Intraday steering: adjust bids and budgets by hour, react when budgets run out.	Customer journeys, multi-touch attribution, media mix and incrementality, custom audiences.
Limits	For more frequent updates Amazon points to Marketing Stream; too many requests lead to throttling.	Advertising data only, no retail data. Stream v1 shuts off on 30 June 2027; v2 is the way forward.	Not a real-time tool; results are subject to aggregation thresholds.