> ## Documentation Index
> Fetch the complete documentation index at: https://docs.upstackdata.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Payment Succeeded Cost: Ad Spend per Successful Payment

> Calculate advertising cost per successful payment. Measure payment acquisition efficiency.

<Tip>
  Payment Succeeded Cost measures how much you spend on advertising for each successful payment.
</Tip>

## Formula

<Info>
  **Payment Succeeded Cost** = **Ad Spend** ÷ **Payment Succeeded**
</Info>

### Formula Components

| Metric                                                                           | Definition                                         |
| -------------------------------------------------------------------------------- | -------------------------------------------------- |
| [**Ad Spend**](/reference/metrics/advertising/blended/blended-spend)             | Total advertising cost from connected ad platforms |
| [**Payment Succeeded**](/reference/metrics/funnel/conversions/payment-succeeded) | Count of successful payments                       |

| Metadata        |                         |
| --------------- | ----------------------- |
| **Type**        | Currency                |
| **Data Source** | [Upstack Pixel](/pixel) |
| **Aggregation** | Ratio                   |

***

## Example

You spent **\$10,000** on advertising in January and processed **2,156 successful payments**.

| Metric                 | Value    | Notes                       |
| ---------------------- | -------- | --------------------------- |
| Ad Spend               | \$10,000 | Monthly advertising cost    |
| Payment Succeeded      | 2,156    | Successful payments         |
| Payment Succeeded Cost | \$4.64   | Cost per successful payment |

***

## How It Works

This metric divides your total ad spend by the number of successful payments. It provides a view of acquisition efficiency at the payment level, useful for businesses with multiple transactions per customer.

***

## When to Use

| Scenario              | Action                                    |
| --------------------- | ----------------------------------------- |
| Transaction-level CAC | Measure cost per payment event            |
| Channel comparison    | Compare payment efficiency across sources |
| Budget optimization   | Allocate spend based on payment volume    |
| Unit economics        | Factor into per-transaction profitability |

***

## Related Metrics

| Metric                                                                                   | Relationship                        |
| ---------------------------------------------------------------------------------------- | ----------------------------------- |
| [Payment Succeeded](/reference/metrics/funnel/conversions/payment-succeeded)             | The denominator in this calculation |
| [Payment Succeeded Value](/reference/metrics/funnel/conversions/payment-succeeded-value) | Revenue from payments               |
| [Payment Failed Cost](/reference/metrics/funnel/conversions/payment-failed-cost)         | Cost for failed payments            |

[See all Conversions metrics →](/reference/metrics/funnel/conversions)