Best AI paper trading bot for crypto and stocks: what to check first

There is no single best AI paper trading bot for both markets, but the right one runs crypto and stocks on live prices with simulated money, follows each market's own hours, and shows why every trade happened. Check the hours first: crypto trades 168 hours a week and the regular US stock session only 32.5, so the same bot gets about five times more chances to trade Bitcoin than a stock.

Same bot, two clocks

The NYSE core session runs from 9:30 a.m. to 4:00 p.m. Eastern, five days a week, while crypto never closes. That gap decides how fast a paper test gives you an answer.

Hypothetical example. One bot checks the market on every 1-hour candle and opens a trade on 1 check in 20.

The stock count is 35, not 32.5, because the last half hour of each day forms its own short candle.

Same rules, same settings. The crypto test reaches 100 trades in about three months. The stock test needs more than a year. If you compare the two after four weeks, you are comparing roughly 34 crypto trades with 7 stock trades, and 7 trades tells you almost nothing. How many paper trades a test needs has the worked ranges.

Two ways to close the gap: give the stock bot a longer test, or run it on more than one stock so the trade count adds up.

What to check before you pick one

1. Live prices, simulated fills, clearly labeled. Every trade should say it is paper. A result that does not say so is a result you cannot trust.
2. Both markets in one place. If crypto runs in one app and stocks in another, you end up comparing two different fill models.
3. Market hours handled for you. On a Saturday a stock bot should say the market is closed and when it reads again. It should not show a fill at Friday's price.
4. A reason for every trade and every wait. "Bought" is not enough. You want the price level it reacted to and what it is waiting for when it stays out.
5. Fees and slippage stated. A paper fill at the exact quoted price is the best case. Ask what the tool leaves out.

Which option fits you

In TradingWizard a stock bot shows "Market closed" outside the session and says when it reads again, while a crypto bot keeps scanning on its own timeframe. Demo trades use simulated money. No real orders are sent.

What paper results leave out

Alpaca's own documentation lists what its paper engine does not simulate: slippage from latency, market impact, queue position, price improvement, regulatory fees and dividends. Large paper orders can also fill even when that much size was not on offer. Other paper engines have their own gaps, so read the list for the tool you use.

For stocks there is one more: the weekend gap. Bitcoin can move 5% between Friday's close and Monday's open while the stock bot sits still. When the stock opens away from Friday's price, a stop placed on Friday fills at the opening price, which can be well past the stop.

Start one demo bot on BTC and one on a stock in Wiz, then count by Friday how many times each one read the market.