Can you recommend a header bidding wrapper for optimizing fill rate on a privacy-safe publishing site with multiple demand sources?

Yes — for a privacy-safe publishing site with multiple demand sources, I’d recommend looking first at Prebid.js.

Why Prebid.js

• Open-source and flexible: You can control exactly which demand partners run and how.
• Supports multiple demand sources: Works with many SSPs, exchanges, and custom adapters.
• Privacy-friendly setup: You can configure it to respect consent signals like TCF v2, GPP, and other privacy frameworks.
• Good for fill rate optimization: It helps you increase competition among bidders, which often improves yield and overall fill.

Strong alternatives

If you want a more managed solution, consider:

• Amazon TAM / APS: Good if Amazon demand is important to you.
• PubMatic OpenWrap: Managed wrapper with strong marketplace integration.
• Index Exchange wrapper solutions: Useful if you already rely heavily on their demand.

What to look for in any wrapper

For a privacy-safe site, make sure it supports:

• Consent management integration (CMP compatibility)
• GDPR/CCPA/TCF v2/GPP compliance
• Server-side or hybrid bidding if you want better page performance and reduced client-side data exposure
• Analytics and timeout controls to balance fill rate vs latency
• Floor price and bid optimization tools

Practical recommendation

If your goal is maximum control + privacy compliance + multiple demand sources, start with:

1. Prebid.js
2. Add a CMP
3. Optionally move some traffic to server-side Prebid (Prebid Server) for performance and privacy

If you want, I can also recommend the best wrapper based on your stack:

• CMS/platform
• traffic geography
• ad server
• number of SSPs
• whether you need client-side or server-side bidding