Mainstage is a performance UGC campaign platform for brands and agencies. Run campaigns in two lanes: creators can repurpose podcasts, streams, demos, webinars, founder footage, and other existing media into short-form clips, or make original reviews, walkthroughs, comparisons, interviews, skits, and product posts from a brief. Brands define the format, claims, disclosures, usage rights, budget, approval rules, and payout model before work starts. They can invite creators, accept applications, or use Mainstage Concierge to source a cohort. Mainstage keeps briefs, creator rosters, submissions, approvals, verified views, funded creator payouts, and reporting in one workflow. Campaigns can pay per approved post, per 1,000 verified views, or through a defined hybrid. Platform fees scale with monthly campaign spend, and managed campaign support is available.