# Why every engine campaign has a $100 daily budget

Engine campaigns open with a $100 daily budget (or the local-currency equivalent). It is a ceiling that keeps learning unblocked, not a spend target: your ACoS or TACoS cap governs actual spend. How to set a hard limit if you need one.

**TL;DR:** Each campaign the engine creates opens with a $100 daily budget, or the local-currency equivalent. That is a ceiling so a campaign is never starved while it learns. Actual spend is governed by the ACoS or TACoS cap on the product and stays far below the budget. The ad engine has no weekly or monthly spend limit; for a hard limit on total daily spend, use Amazon's account-level daily budget cap.

URL: https://autron.ai/help/budget-cap  
Updated: 2026-10-02  
By: Autron

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If you open your Amazon Ads console you will see the campaigns the engine created with the same daily budget: **$100**, or the equivalent in your marketplace's currency. A few open higher, where a term's history shows it already spends close to that in a day. Sellers notice, and reasonably ask whether that is what they are about to spend.

## A ceiling, not a target

The engine builds many small campaigns, typically one per keyword or target, and optimises each one's bids toward the product's goal. The budget's only job is to make sure a campaign is never cut off mid-day while it is learning. A campaign that hits its budget at noon stops collecting the data the engine needs. So every campaign gets a generous ceiling, and real spend is controlled somewhere else.

What actually governs spend is the **target** on the product. The engine bids to keep your actual ACoS or TACoS under the cap you set, and lowers bids when a campaign is not earning its keep. A single-keyword campaign at a sensible bid spends a few dollars a day, not a hundred. Across the account, spend follows your caps, not the sum of the budgets.

## If you need a hard limit

Your target keeps spend efficient; it does not promise a maximum. If you need one, for a cash constraint or a launch you want capped, set an **account-level daily budget cap** in Amazon Ads. Amazon then stops serving your ads for the rest of the day once total spend reaches your number, whoever created the campaigns. The engine works normally underneath it.

The ad engine has no weekly or monthly spend limit, and it does not pause campaigns when spend reaches a figure. Your goal is an efficiency target; Amazon's cap is the ceiling on total spend. If you want spend watched against a weekly or monthly figure, a [routine](https://autron.ai/help/routines) can check it on a schedule and warn you, or pause campaigns, as it gets close.

Changing individual campaign budgets is not the tool for this: lowering one budget does not bound the others.

## Related

- [Manage goals](https://autron.ai/help/manage-goals)
- [How Autron creates and manages campaigns](https://autron.ai/help/how-autron-creates-and-manages-campaigns)