Live An AI is improving trading bots right now — in public

Watch an AI build trading bots. Then spot the price gap nobody else sees.

A paper-trading sandbox for prediction markets. Build bots from a growing library of plain-English signals, let Grok evolve them, and line-shop the same event across two exchanges. All simulated — free, no card.

Start with $10,000 — free → Build a bot → Watch the AI
✓ $10k play-money bank · paper trading, no real money · no credit card
◆ ArbitrageSame event, two exchanges
live
🏛️Will the Fed hold rates in June?
KXKalshi
—
YES costs
gap — → buy cheaper
PMPolymarket
—
YES costs
Blended fair value — —
📄 All simulated · paper trading last fill — no real money, ever
🚀Start with a ready bot
Fork a working starter — one per category — then tune it live with sliders and improve it with AI.
Browse starter bots →
✨Ask Grok about a bet
Pick a live market, get an honest AI read — YES or NO — plus a starter bot built to trade it.
Ask Grok →
01The weapon · Grok

An AI that improves your bots — and proves it works.

Every few hours, Grok proposes one mutation to a live bot, backtests it head-to-head, and auto-promotes only genuine winners to live paper. Watch it climb the board on /promoted — then point it at your bot.

Open the Evolution Lab
Grok grok-4.3
↳ Proposed mutation
yes_ask_max0.28→0.31
✓ Improved beat parent by +$472 over 31 trades
02The secret weapon · Arbitrage

Line-shopping, finally for prediction markets.

The same event trades on Kalshi and Polymarket — at different prices. We match identical-resolution events, blend both books into a fair value, and point you to the cheapest place to buy. The edge sports bettors have used for decades. Nobody else does this for PMs.

See live arbitrage
Live price gaps Fed · MLB
EventKalshiPolyBuy cheaper
03The signal library · grows weekly

Arm your bot with pro signals — in plain English.

“only when the yield curve is inverted.” “only when crypto Fear & Greed < 25.” Pick from a growing library of 25+ free, real-data signals across 8 markets — weather, crypto, sports, macro, energy, stocks & more. Each reads in plain English; you click to drop it into a bot. No code, and new signals ship every week.

Browse the signal library See what's coming →
Plain-English signals 25+ · growing
📉only when the yield curve is inverted+ add 😱only when crypto Fear & Greed < 25+ add ⚾only when our MLB model beats the price by 8++ add 🛢️only when crude oil drew ≥ 2,000 kbbl+ add 🪧only when jobless claims spike+ add Browse all 25+ signals →

Free to play. Build in two minutes.

One account, magic-link sign-in, full access. No card, no real money.

1

Sign up free

Magic link, no password, no card. One account unlocks everything — bots, tools, arbitrage, the Lab.

2

Build or borrow a bot

Express a thesis as rules, gate it on our signals, or fork a proven winner. It paper-trades at flat $5/fill so results reflect skill, not bankroll.

3

Let Grok improve it

Watch the AI evolve the public bots — and fork any winner into your own. Soon, spend credits to point Grok at yours. Compete on the live leaderboard.

Start building — free.

Watch an AI improve trading bots, shop the price gap between two exchanges, and arm your bots with a growing library of plain-English signals you can't get anywhere else.

Get my magic link → Build a bot → Watch the AI first
Free forever to play · paper trading only · paid Grok-mutation credits come later, nothing gated today