Finance
Sidemarket
A calm watchlist for prediction markets. Bring your own EV.
ios· Free · all features included ·By All Things AI, Inc
Free. All features included.
No subscription, no in-app purchases, no paid tiers. Everything you see works the moment you install it.
About this app
What Sidemarket does
Sidemarket is the watchlist + decision tool for prediction-market traders on Kalshi and Polymarket. It doesn't connect to your account, doesn't place trades, and doesn't broadcast your positions. It's the spreadsheet you'd build yourself if you had the patience: a watchlist of markets you care about, an EV calculator, a base-rate library for the categories you trade, and a journal of the trades you've actually made. What's in v1: — Watchlist: paste a market URL or pick from 40 bundled categories (NFL Super Bowl winner, US recession 2026, BTC > $200K, Fed rate path, election outcomes...). Track your perceived fair-value vs. market price, side-by-side. — EV calculator: enter your edge, the offered price, and your bankroll. Sidemarket computes EV, Kelly stake, and a half-Kelly recommendation. The math is open-source classic — no black box. — Base-rate library: 60 hand-curated base rates with sources (incumbent advantage in US presidential, March Madness #1 seed wins by round, Fed action implied by Fed Funds futures, etc.). The base rate is the only edge most retail traders have. — Trade journal: log every position with entry price, your fair-value at entry, exit, p/l. No broker integration — you copy from your account once. — Lessons: a learned-rules log. Each time a trade closes badly, log the lesson in one sentence. The journal is the moat. Sidemarket is not connected to Kalshi or Polymarket. It's a calm second-screen. Free. Optional Sidemarket Pro ($19.99/yr) adds the journal export, custom base-rate entries, and the multi-bankroll mode.
Features
Built to be useful, not noisy.
Watchlist
Cross-platform market watchlist.
EV + Kelly calculator
Open math, no black box.
Base-rate library
60 curated base rates with sources.
Trade journal
Manual log, lessons attached.
Why it exists
The problem
Kalshi $22B val / $178B annualized volume. Polymarket relaunched US Nov 2025. Bloomberg covered the category as a real asset class. AI agents are 30% of Polymarket trades — retail traders can't compete on speed but can compete on patience + base rates. The journal/calculator/watchlist combo doesn't exist as one calm app.
What's different
How Sidemarket stands out
Sidemarket is the only iOS tool that combines: (a) cross-platform watchlist for Kalshi + Polymarket markets, (b) classic EV + Kelly calc with open math, (c) base-rate library curated for the categories these markets trade, (d) trade journal as the core surface (not an afterthought). LayerHub is AI-agent infrastructure for institutions. Predict.fun is a marketplace. Sidemarket is the discipline layer.
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FAQ
Questions about Sidemarket
How much does Sidemarket cost?▾
Sidemarket is free. All features are included from day one — no subscription, no in-app purchases, no paid tiers. Everything you see in this listing works the moment you install it.
Where does Sidemarket store my data?▾
On your device. Sidemarket is built privacy-first: no account is required, no analytics SDKs, no third-party trackers. Nothing is uploaded to a server we control — the app works without one.
What platforms does Sidemarket support?▾
iOS, on iPhone and iPad. You can find the latest availability on this page.
How do I get support for Sidemarket?▾
Use the Support link on this page, or email support@allthingsn.com. We answer every message and keep responses on the same thread.
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