Tomorrow Markets

Leaderboard

The frontier in
simulated markets.

Trade a simulated or historical order book. Build a portfolio through a year of market history.

Help Tomorrow Markets grow

Your contributions will help fund dedicated server space and a domain, a database and faster loading, and room for more players in our lobbies.

Trader handle

Discretionary, up to 20 traders. No room code needed.

or join a room

Choose your challenge

Choose the data and session length, then enter a challenge.

Session settings · 5 days · 20 min

Trading order book

Trading real duration

Trading sessions

Decision / chart bars

Enable learning in the spectator RL arena

Portfolio dataset · 30 assets

Portfolio decision rounds

Portfolio time per allocation round

Upload .py / .R / .json

Reference

Each turn, data has

close, open, high, low, volume — lists, oldest first
returns — % change bar to bar
sma20, sma50, ema12, ema26 — moving averages (None until warmed up)
book["bids"], book["asks"] — [{"price":.., "qty":..}], best first
book["mid"], book["spread"], book["imbalance"] — top-of-book, imbalance in [-1, 1]
orders: your working limit orders
account["cash"|"shares"|"avg_entry"|"realized_pnl"|"unrealized_pnl"]

To trade

market_order("buy" | "sell", qty)

limit_order("buy" | "sell", qty, price)

cancel_all(): pull all your working orders

How a game runs

Define on_tick(data). At each selected decision bar the market pauses for a decision round: every strategy in the room gets the same snapshot, orders are placed, then the day carries on.

Backtests allow up to 60 seconds per decision. Timed sessions use a shorter budget based on the selected bar interval. A strategy that runs out of time is restarted (top-level variables reset). One that errors 5 rounds in a row is stopped for the day.

numpy, pandas and other Pyodide packages import normally.

Preparing market…Displayed depth: — · imbalance —

Price action $100.00

Order book Resting depth · 15 levels

PriceResting qtyValue ($)

Spread $0.00

Time & sales

Executed volume

Day volume: 0
Run volume: 0
Last bar volume: 0
Last trade: —

TimeSidePriceShares

Waiting for executions…

Place an order

Click a book price to fill the limit price. Quantities are shares.

Quantity

Limit price ($)

Stop loss ($)

Take profit ($)

Quick size

Positions & PnL

Working orders 0

No active open orders

Active SL / TP 0

No stop loss or take profit on open positions

Cash balance$10,000.00

Shares held0

Avg entry$0.00

Position value$0.00

Unrealized PnL+$0.00

Realized PnL+$0.00

Indicator & algorithmic strategy engine

Workspace inactive

Workspace reserved for script execution and technical indicator overlays

Portfolio management

One calendar year · 30 assets

Round — · —

Waiting…

Your target allocations

Use up to 100% of your capital. Save changes before each deadline; your saved percentages are reapplied at every new round. The remainder stays in cash. Long only, fractional shares, no fees.

Current adjusted prices, returns already observed, and target portfolio allocations
Asset	Adj. price	Last round	Year to date	Allocation %

0% invested · 100% cash

The frontier in
simulated markets.

Help Tomorrow Markets grow

Choose your challenge

Waiting for players

Time & sales

RL arena · spectators

Market closed

Portfolio management

Your target allocations

Build the next chapter

The frontier insimulated markets.

Help Tomorrow Markets grow

Choose your challenge

Waiting for players

Time & sales

RL arena · spectators

Your target allocations

The frontier in
simulated markets.