AMS vs AMC: Which Amazon Ad Data Tool to Use, and When

Amazon Marketing Stream (AMS) and Amazon Marketing Cloud (AMC) sound like the same product with two names. They aren't. They sit at opposite ends of the ad-data workflow — one is about acting right now, the other is about understanding what happened and why.

Get them confused and you'll either try to build real-time bidding on a tool that only answers historical questions, or try to run multi-touch attribution on a firehose of raw hourly metrics. Here's the clean mental model.

AMS auto-pushes your hourly ad data into AWS infrastructure that you own. Roughly one hour of latency, push-based, built for real-time action.

You subscribe an advertiser profile to a dataset — sp-traffic, sp-conversion, budget-usage, sb-traffic, sd-traffic — and Amazon delivers that dataset's hourly snapshots into your SQS queue or Firehose stream. No polling the Reports API, no throttling, no waiting for yesterday's daily report.

• Freshness: hourly, ~1 hour after the hour closes
• Shape: raw campaign / ad group / keyword metrics (impressions, clicks, cost, conversions)
• Delivery: pushed into your AWS (you provision SQS or Firehose)

AMC is a privacy-safe clean room where you run SQL against years of pseudonymized, event-level data. Query-based, historical, built for analysis.

Instead of raw hourly totals, AMC holds signal-level events — impressions, clicks, and conversions tied to hashed user identifiers — that you can join across campaigns and time. It answers the questions a spreadsheet of daily totals never can:

• Attribution: which touchpoints actually drove the sale, not just last-click
• New-to-brand: which campaigns bring genuinely new customers
• Path to purchase & audience overlap: how Sponsored Products, Sponsored Brands, and DSP work together

You don't get live data and you don't get raw hourly rows — you get a SQL workbench over a deep, privacy-protected history (typically the trailing ~12–13 months).

If the sentence contains “right now” or “this hour,” it's an AMS job:

• Intraday bid adjustments — cut bids on a keyword whose ACOS is spiking before the day's budget is gone
• Budget pacing — throttle or pause campaigns burning budget too fast in the morning
• Real-time dashboards — hourly performance that doesn't depend on someone pulling a report
• Overspend / anomaly alerts — ping Slack the moment CPC or spend jumps

If the question is “what happened over the last quarter, and why,” it's an AMC job:

• True attribution — which campaigns drove conversions across multiple touchpoints, not just the last click
• New-to-brand analysis — how much of your spend actually acquires new customers
• Audience overlap & incrementality — where Sponsored Products, Sponsored Brands, and DSP overlap or add reach
• Combining ads with first-party signals — join Amazon ad events with your own audiences (uploaded privately)

AMS and AMC aren't competitors — they're the two halves of a mature ad-data stack.

AMS is the nervous system: it reacts to what's happening this hour. AMC is the brain: it learns from months of history. The best setups close the loop — you use AMC to discover that, say, a particular daypart drives most of your new-to-brand orders, then encode that insight into AMS-driven automation that bids harder during those hours.

Start with whichever matches your immediate pain: AMS if you want automation and live dashboards quickly, AMC if you're making strategic budget and attribution decisions.

Do I need AWS to use AMC?

No. AMC is a managed clean room you query with SQL — no AWS account required. AMS is the one that pushes data into your AWS, so it needs S3/SQS/Firehose and IAM roles.

Can AMC give me hourly or real-time data?

No. AMC is built for historical, event-level analysis over months of data. If you need this-hour numbers, that's AMS.

Can AMS do attribution?

Not really. AMS delivers raw hourly metrics (impressions, clicks, cost, conversions) per campaign/keyword. Multi-touch attribution and path-to-purchase live in AMC.

Which should I set up first?

If your goal is automation, alerts, or live dashboards, start with AMS. If your goal is strategic analysis — attribution, new-to-brand, audience work — start with AMC. Many teams end up with both.