YCW26ยท OtherForum
The first exchange to trade on attention.
Founders
Not read from YC yet; the weekly run fills these in.
Same space
Adjacent
Overlapping tags, a different niche.
KalshiW191st federally regulated exchange where people can trade on eventsShared: exchange, trade, classActive
CreatorMLW23Foundation Model for Human AttentionShared: attention, socialInactive
OssusW26Intelligence for cultural institutionsShared: culturalActive
ComputableS26Derivatives Exchange for ComputeShared: exchangeActive
TradeW17We're building Africa's Commodity Exchange.Shared: exchange, trade, directlyInactive
Also from W26
Batchmates in Winter 2026.
/dev/fastW26/dev/fast is the AI-native code forgeActive
10x ScienceW26The AI-native platform for next-generation protein characterization.Active
21stW26UI building blocks for the agentic internetActive
AemonW26The Forward-Deployed AI Research EngineerActive
Agentic FabriqW26The control plane for AI agents.Active
Alt-XW26Building the best venue for private markets exposure.Active
About Forum
Forum is building the first exchange to trade on cultural attention. We create indices from search, social, and streaming data to measure what the world cares about, enabling users to go long or short on changes in relevance. Attention is the primary driver of business success in the digital age, but it has never been directly tradable. Forum introduces attention as a new asset class for managing cultural and demand risk.
New York City, NY, USA
Forum: questions
Which YC batch was Forum in?
Forum was in Y Combinator's Winter 2026 batch (W26).
Is Forum still active?
Y Combinator lists Forum as active.
Where is Forum based?
Forum lists New York City, NY, USA as its location on YC's directory.
Not affiliated with Y Combinator. From YC's public directory. Logos via logo.dev; trademarks belong to their owners.