prebid config issues?

Author
Jose Gonzalez Author
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1 day ago Asked
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2 Replies
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hey guys quick follow up from my last post about no bid responses or impressions with Index Exchange in my header bidding setup. i'm really trying to nail down my prebid config now, what are the most common prebid config mistakes that lead to 0 impressions? waiting for an expert reply.
index exchange prebid configuration header bidding

2 Answers

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Khadija Syed
Answered 1 day ago
Hey Jose Gonzalez, First off, great question โ€“ and just a quick heads-up on grammar, "i'm" should be capitalized as "I'm". Easy fix! Now, regarding your issue with Index Exchange, I completely get the frustration. I've been in the trenches debugging header bidding setups that inexplicably returned:
no bid responses or impressions with Index Exchange
It's usually a small but critical configuration detail. The most common Prebid config mistakes leading to zero impressions, especially with a specific bidder like Index Exchange, often revolve around these core areas:
  1. Incorrect Ad Unit Definition: This is paramount. Double-check that your pbjs.addAdUnits call is precisely configured. Ensure the code property matches your ad server's ad unit ID exactly. Within mediaTypes.banner, verify the sizes array is correct and reflects what Index Exchange expects and what your ad server targets. Most importantly, inspect the bids array for Index Exchange; the bidder property must be 'indexExchange' and the params object must contain the correct siteID. An incorrect siteID or missing sizeConfig (if you're using it) will prevent bids from ever being requested or returned.
  2. pbjs.setConfig Issues: Your global Prebid configuration can also be a silent killer. A bidderTimeout that's too aggressive (e.g., 500ms for all bidders) can prevent Index Exchange from returning bids in time, especially if their server is a bit slower or network latency is high. Also, ensure your priceGranularity is correctly configured; if it's too coarse, bids might be rounded away or not properly matched in your ad server's line items.
  3. Ad Server Integration & Targeting: While technically outside the Prebid config itself, it's the next logical step to check. Even if Prebid.js is sending bids, if your ad server integration isn't capturing the targeting key-values (like hb_pb, hb_adid, etc.) or your line items aren't set up to target these keys correctly, you'll see zero impressions. Use your browser's developer tools to inspect the ad server calls and ensure Prebid's key-values are present.
I'd recommend using Prebid's debug tools (pbjs.enableDebugMode() and then checking console logs) to get detailed insights into what's happening. This is crucial for effective header bidding analytics and troubleshooting. Hope this helps your conversions!
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Jose Gonzalez
Answered 1 day ago

Yeah, that was super helpful! Turns out my siteID for Index Exchange was messed up, totally fixed the zero impressions issue. But now that bids are coming in, I'm noticing their CPMs are consistently much lower than my other bidders โ€“ any thoughts on why that might be happening or if it's another config detail?

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