# Micro-bidding Tool

##### Summary

Use the Micro-bidding Tool to assign different bids to specific Source IDs or Sub IDs.

##### Before You Begin

- Role: Advertiser
- Required information: 
    - source IDs and/or Sub IDs
- Estimated time: 2-4 minutes

##### Steps

1. Locate the **Black/Whitelist** section and the Micro-bidding Rules field.
2. Click **Add bid rule** to create a new bidding rule.  
    ![microbid_v310526.png](https://wiki.dao.ad/uploads/images/gallery/2026-05/scaled-1680-/microbid-v310526.png)
3. Enter the Source IDs or Sub IDs and set a custom bid for them.  
    ![microbid_2_v310526.png](https://wiki.dao.ad/uploads/images/gallery/2026-05/scaled-1680-/microbid-2-v310526.png)<p class="callout info">**Information:** Micro-bidding rules override the default campaign bid for the specified Source IDs or Sub IDs.</p>
4. Repeat the process to create additional bidding rules if needed.

##### Troubleshooting

**Issue:** I don't know the Source IDs or Sub IDs

**Solution:**

- use the `{source_id}` and `{sub_id}` parameters in your tracking URL or postback to identify traffic sources and sub-sources.


##### Verification

<div id="bkmrk-after-saving-the-cam">After saving the campaign, the configured source IDs or sub-source IDs will appear in the corresponding bid-rule field.</div>
##### Related

- [Blacklist and Whitelist Targeting](https://wiki.dao.ad/books/optimization-reporting/page/blacklist-and-whitelist-targeting "Blacklist and Whitelist Targeting")
- [Traffic volume and bid recommendations](https://dao.ad/en/traffic-volumes)
- [Automatic Rules for Blacklisting](https://wiki.dao.ad/books/optimization-reporting/page/automatic-rules-for-blacklisting "Automatic Rules for Blacklisting")