<b>The hidden setting that rounds your bids down</b>

<b>The hidden setting that rounds your bids down</b>

Your ad server often can't accept "$2.47." It accepts bids in buckets, like every 10 cents. That rounding rule is "price granularity."

Why it matters: with wide buckets, a $2.47 bid might get filed as $2.40. Multiply seven cents lost across millions of impressions and it's real money.

Tiny example:
— Bid $1.99, bucket of $0.50 rounds it to $1.50
— Bid $1.99, bucket of $0.01 keeps it at $1.99

One thing to try: in low ranges (under $5), use fine buckets like 1 cent. Above $20, wide buckets are fine, those bids are rare anyway.

In plain English: coarse rounding quietly shaves cents off every winning bid.