Paper trading · real prices
Test a trading idea in plain English, on real prices.
Write your rule the way you would say it out loud. We replay it on a coin's real price history and show every pretend trade, what it made or lost, and how bumpy the ride was.
Uses public Solana price candles. Paper only: no orders, no funds, nothing to sign.
Rule no. 1
How it works in 3 steps
- 01
Write a sentence
Like “buy when price drops 10% from the high, sell at +20% or -8%”.
- 02
Pick a coin
We fetch its real price candles and step through them one by one.
- 03
Read the score
Every pretend trade, profit or loss, win rate and worst dip.
Paper only. Nothing is bought, sold, moved or charged.
Tool 1 · Rule writer
Say your rule. We read it back.
What this does: turns your sentence into a clear checklist of when to buy and when to sell, and flags any words it did not understand.
Which phrases does it understand?
- Buy: “buy when price drops X% from the high [of the last N candles/hours]”, “buy when price rises X% in N candles”, “buy when price crosses above the N-candle average”, “buy when price is X% below the N-candle average”, “buy when price breaks the N-candle high”, “buy and hold”.
- Sell: “sell at +X% or -Y%”, “take profit X%”, “stop loss Y%”, “trailing stop X%”, “max hold 2h / 3 days / 10 candles”, “sell when price crosses below the N-candle average”.
- Settings: “fee 0.3%” (each side, default 0.25%), “wait N candles after a sale”, “size $500”.
Tool 2 · Replay
Run it on a real coin's past prices
What this does: fetches real price candles for the coin you pick and plays your rule through them, stamping every pretend buy and sell.
Selected: SOL
Press “Replay my rule” to stamp trades on a real chart.
Trade log
Fills are assumed at candle prices: buys at the close of the signal candle, stops and targets at their level. If a stop and a target fall in the same candle we count the stop. This is a simulation on past data, not a forecast.
Tool 3 · Compare settings
Which profit target and stop worked best?
What this does: keeps your buy rule, then replays 36 combinations of profit target and stop loss on the same candles, and colours each by result.
Run a replay first, or press “Try an example”.
The best cell is the best in hindsight. Picking settings this way tends to look better than the future will be.
Tool 4 · Notebook and signed copy
Keep your rules, share them, sign them
What this does: saves rules in this browser, makes a share link, and lets your wallet put a free signature on a rule so others can check you wrote it, and when.
Signed rule card
—
- Signed by
- not signed yet
- Time
- —
- Signature
- —
- Check
- —
Signing is free: your wallet signs a short text, nothing is sent to the chain. The example uses a throwaway key made in your browser.
Tool 5 · My coins
Replay on a coin you own
What this does: lists the coins in a Solana wallet so you can replay your rule on one with a click. Connect a wallet, or paste any address.
From sentence to score
What happens when you press replay
- You write a sentence. Plain words, typed like a memo.
- It becomes a checklist. Buy condition, sell conditions, costs.
- Each candle is checked. One by one, left to right, like a finger along the page.
- The score is totalled. Trades, win rate, profit and worst dip.
Flowcharts
How a replay runs, and what leaves your browser
Margin notes
Words you will see here
- Candle
- One slice of time on a price chart (say one hour) with its opening, highest, lowest and closing price.
- Paper trade
- A pretend trade on past prices. Nothing real is bought or sold.
- Take profit / stop loss
- Sell when you are up by a set percent, or cut the loss when you are down by a set percent.
- Trailing stop
- A stop that follows the price up, then sells if it falls a set percent from its best point.
- Worst dip (drawdown)
- The biggest fall from a high point of your pretend account to a later low.
- Mint address
- The unique address of a token on Solana. Pasting it picks exactly that coin, never a copycat.
Roadmap
Done, in progress, on the list
- ✓ Done
Plain-English rules
Dip, momentum, average, breakout and hold entries with profit, stop, trailing and time exits.
- ✓ Done
Replay on real candles
Any Solana coin with price history, four candle sizes, trade log and CSV.
- ✓ Done
Settings comparison and signed rules
36-cell profit/stop grid, saved rules, share links and wallet-signed rule cards.
- In progress
Two rules side by side
Run two sentences on the same coin and compare their curves.
- Planned
Volume words
Phrases like “only when volume is above its average”.
- Planned
Walk-forward check
Pick settings on the first half of the data, test them on the second half, to expose lucky fits.
Tokenomics · planned
The Rulepaper coin
No coin is live yet. Below is the planned structure. Every tool on this page is free without it.
- Supply0 tokens, fixed
- Mint authorityOff
- Freeze authorityOff
- Team shareOnly what is bought on the curve
- Liquidity at graduationLocked or burned
- Price…
- Market cap…
- On-chain supply…
- Holders…
The coin promises nothing: no returns, no share of anything, no special access.
FAQ
Fair questions
What is this, in one sentence?
You type a trading rule in everyday words and see how it would have done on a real coin's past prices, without risking anything.
Is it safe? Does it touch my money?
No money is involved. The page only reads public price data and, if you ask, the list of coins in a wallet. Signing a rule card is a free text signature, not a transaction.
Will a rule that did well keep doing well?
Not necessarily. Past prices are one path out of many. Treat a good replay as a reason to look closer, never as a promise.
Where do the prices come from?
Public Solana price candles from Jupiter's data service, the same kind of data a chart shows. Wallet lists are read from Solana mainnet.
Why did my rule never trade?
The condition never happened in the window. Try a smaller drop, a longer window, a bigger candle size or a more volatile coin.
Can it place the trades for me?
No, and it will not. This page has no way to place orders. It is a notepad for testing ideas.