Traffic & geos
Sweeps: gift card
'Win a $500 gift card' SOI sweepstakes affiliate sub-vertical.
Gift-card sweepstakes are the most common affiliate sweepstakes offer: 'enter for a chance to win a $500/$1,000 Walmart/Amazon/Visa gift card.' Pure SOI lead-gen — name + email, sometimes phone + zip. CPL $1.50–$3.50 in the US. Volumes are huge but post-lead monetization quality is low (the leads are then routed through downstream call-center or email-marketing programs that share back a fraction of the eventual payout).
Example
Walmart $500 gift-card sweeps SOI offer at $2.40 CPL runs on PropellerAds push at $0.018 CPC, clears $7.20 EPC blended on a 3-step survey-prelander pattern.