Field	Value
Bid Source Simulated = mock CPM. Real = live SSP auction.
Content URL *
GAM Base Tag *	https://pubads.g.doubleclick.net/gampad/ads?iu=/21775744923/external/single_ad_samples&sz=640x480&cust_params=sample_ct%3Dlinear&ciu_szs=300x250%2C728x90&gdfp_req=1&output=vast&unviewed_position_start=1&env=vp&impl=s&correlator=
Prebid Timeout
Prebid Cache URL *
Mock Bid CPM
Strategic Bias	On (+$0.05)
Floor Min ($) Reject bids below	Off
Floor Max ($) Cap bids above	Off

▶

Production Tag Generator

Configure the auction, then generate a copy-paste embed tag for the publisher.

Engine v2.5.0 • Prebid.js v11.11.0

Ad Serving

The ad tag, placement type, and pricing controls that drive the auction.

GAM Master Ad Tag URL*

PlacementiInstream — publisher already has a video player with content (news, shows, sports); the ad runs pre/mid/post-roll. Requires a content video URL. Best CPMs.

Outstream — no video content (article, blog, listing). The unit drops into the body, autoplays muted on scroll-into-view, and collapses when done. Emits data-placement="outstream". Instream needs a content video; outstream is self-contained and autoplays on scroll.

Engine DeliveryiAuto-update emits a tiny loader tag that loads the latest stable engine from the release channel — the publisher never re-issues the tag when we ship an update, and we can roll back instantly. Pinned hard-codes @v{VERSION} (immutable) — use when a publisher requires a frozen build. Auto-update tags pick up new engine releases automatically; pinned tags never change.

Video Content URL

Bidder Timeout (ms)

Strategic Bias ($)iA thumb-on-the-scale amount added to the winning header-bid CPM before price-bucketing. Switch off to pass the raw bucketed CPM through unchanged (emits data-bias="0.00"). Off Nudges the winning CPM up before bucketing. Off by default.

Floor Min ($)iReject bids below this CPM. Bids that don't meet the floor fall through to your house line item (emits data-floor-min="X"). Off Lowest CPM you'll accept. Below this, bids are rejected.

Floor Max ($)iCap the winning CPM at this value before bias and bucketing — prevents high bids from overshooting your highest GAM line item (emits data-floor-max="X"). Off Highest CPM to pass through. Caps bids that overshoot your top line item.

Biddersv2 multi-bidder

Tick the SSPs that should compete — the highest CPM wins the impression.

Limelight is on by default. Add others as your inventory expands.i⚠ Bundle compatibility: the Prebid URL (in Hosting & CDN below) must point at a bundle that includes every adapter you tick. If an adapter is missing, that bidder is silently dropped at auction time. Need an SSP not listed? Trigger a new bundle build ↗

Hosting & CDNadvanced — auto-filled

Universal Hosted Engine Script URL*iAuto-derived from the pinned release version. Override only if you know what you are doing. Auto-filled — pinned to the latest release.

Prebid.js Hosted Library URL*iPick the bundle from prebid/ that contains the bidders you tick above. How to build a new bundle ↗ Must include every bidder you ticked above.

Prebid Cache URL

Div ID (Mount Point)

Debug Mode by Default?

Player Behaviouradvanced

Autoplay on Load

Start Muted

📐 Player Sizing

⏳ Preload Behavior

🏆 VPAID Access Mode

Loop Content

Replays the content video after it ends — recommended for ad refresh continuity.

Sticky / Floating Player

Instream only. When the player scrolls out of view it docks to a corner and keeps playing (with a ✕ to close) — lifts viewability & completed views.

✓ Copied to clipboard

⚠️ Generation Blocked: Please fill in all required fields marked with (*).

📋 Publisher Integration HTML Tag 0 lines • Deployment Integration Tag

💡 Paste this snippet where the player should appear.iThe publisher copies this snippet and inserts it exactly where they want the video player to initialize. The script handles asset streaming and the auction remotely — no other setup needed.

📋 Integration Blueprint Overview

📊

GAM Key-Value Reference

All hb_* targeting keys emitted by the Bidding Player engine

Send All Bids · v2.2.0+

Standard Keys — Emitted on Every Winning Auction

Key	Example Value	Source	GAM Line Item Use
`hb_pb`	`2.50`	Winning CPM, bucketed + biased	Target price-bucket line items. One line item per $0.10 step ($0.10–$30.00).
`hb_bidder`	`appnexus`	Winning bidder code	Bidder-level reporting. Can target bidder-specific creatives.
`hb_uuid`	`3b25cafe…`	Prebid Cache UUID	Required in VAST creative: `…?uuid=%%PATTERN:hb_uuid%%`
`hb_adid`	`abc123ef`	Creative ID from bid response	Attribution and creative-level reporting in GAM.
`hb_size`	`640x360`	Measured player dimensions	Size-based line item targeting.
`hb_format`	`video`	Always "video" for instream	Filter video-only line items from display line items.

Per-Bidder Keys — Send All Bids (enabled since v2.2.0)

With enableSendAllBids: true, Prebid emits a copy of five standard keys for every bidder that returned a bid — not just the winner. This lets you build per-bidder GAM line items (e.g. target hb_pb_appnexus = 2.50) and get bidder-level revenue attribution in GAM reports without custom scripting.

Key Pattern	Example (AppNexus)	Description
`hb_pb_<bidder_code>`	`hb_pb_appnexus = 2.50`	Price bucket for this specific bidder
`hb_bidder_<bidder_code>`	`hb_bidder_appnexus = appnexus`	Bidder code — useful for per-bidder creative targeting
`hb_adid_<bidder_code>`	`hb_adid_appnexus = abc123`	Creative ID for this bidder's ad
`hb_size_<bidder_code>`	`hb_size_appnexus = 640x360`	Player size from this bidder's response
`hb_uuid_<bidder_code>`	`hb_uuid_appnexus = 3b25…`	Prebid cache UUID for this bidder's creative

Active bidder codes in this bundle:

VAST Creative Template

Your GAM header-bidding line items need a VAST wrapper creative that resolves the winning bid's cached ad. Paste this URL into the VAST tag URL field of your GAM creative:

https://prebid.adnxs.com/pbc/v1/cache?uuid=%%PATTERN:hb_uuid%%

%%PATTERN:hb_uuid%% is a GAM macro replaced at ad-serve time with the value of the hb_uuid key-value. If you override the Prebid cache URL in Hosting & CDN, update this creative URL to match.

GAM Line Item Setup — Quick Guide

Step 1 — Create Custom Key-Values in GAM

Admin → Key-values → New. Type: Predefined. Create each key below:

Step 2 — Create Price-Bucket Line Items

Create one line item per $0.10 price step:

Name: Prebid HB — $0.50
Type: Price Priority
Rate: $0.50 CPM
Priority: 12 (above house, below direct)
Key-value targeting: hb_pb = 0.50
Creative: VAST wrapper (template above)

Repeat for $0.10 → $30.00 (300 line items). Use GAM's duplication feature or a setup script.

Step 3 — Attach VAST Creative to Each Line Item

The VAST creative must include %%PATTERN:hb_uuid%%. Without the cache UUID macro, GAM cannot resolve the winning bidder's ad and the slot will be empty. One creative can be shared across all 300 line items.

Step 4 — Verify with the Sandbox

Run a test in the Sandbox tab. Phase 5 shows the exact hb_pb value sent to GAM — verify it matches a line item you've set up. Phase 6 shows the full stitched ad tag URL with all key-values appended to cust_params.