Hey 👋 Dave here, solo founder of Tickerbook. This started a few months ago when I noticed the same contract "Fed cuts at the May FOMC "was trading at 0.35 on Polymarket and 0.41 on Kalshi. Same event, same day, 6 cents apart. Looked again the next morning — still there, different number. Looked again the next week — structural. Turns out this happens on hundreds of contracts. Kalshi is US-regulated, Polymarket is permissionless and global, and their user bases + fees + liquidity profiles mean prices diverge in ways that don't close themselves. Nobody was surfacing it in one place. So I built Tickerbook. It reads both books as one: → Arbitrage scanner — cross-venue mispricings with net edge after fees → Dutching — multi-outcome events where the full basket costs less than $1 → AI briefs — structured research on any contract (powered by Claude Sonnet 4.6) Important: we're not a broker. No custody, no execution. You trade on the venues themselves. Tickerbook is a research tool — that's the whole product. Launch pricing: $29/mo for the first 1,000 members, locked for life. Then it goes to $49. There's a free tier too. Would genuinely love your feedback. What's missing? What's confusing? If you trade prediction markets, I want to hear it. 🙏

Tickerbook

Two markets, one book

Two markets, one book