SponsorStack is a finance-and-ops SaaS for creators and micro-sponsors who are currently managing brand deals via DMs, email threads, and ad-hoc invoices. Mid-tier creators (10k–500k followers) and niche B2B influencers complain across Reddit and X that most tools focus on discovery/marketplaces, not on executing deals, tracking deliverables, and reconciling payments. SponsorStack provides: - Standardized, jurisdiction-aware sponsorship agreements with revenue share, usage rights, and FTC disclosure baked in. - Milestone and deliverable tracking (posts, stories, UGC assets) with brand approvals and an evidence trail for disputes. - Automated invoicing, escrow-like payment flows, and tax-ready summaries for both creators and sponsors. Unique angle: focus on repeat relationships between the same creator-brand pairs (not one-off campaigns), building a valuable graph of performance and payment behavior that powers underwriting for advances or factoring in a later product.