Acrobat Sign is sold on transactions, the completed signature events that count against an annual entitlement. Adobe also splits the product across user tiers and bundles it into Acrobat Pro and larger Document Cloud agreements, which blurs what the signing capability actually costs.
The commitment is set generously at signing because a high transaction baseline is hard to walk back later. Most teams never reconcile the entitlement against real signing volume, so the headroom you pay for goes unnoticed until the renewal makes it permanent.
Where volume does grow, the overage rates apply, and those rates are rarely the ones you negotiated up front. Unpicking the bundle and the tier structure is the only way to know what Sign should cost you.
