Help with Backtester - Question about mida

[hmpmarketing]

Here is a recent test I made:

Full Code:
backtest.txt

Periods CSV:
periods.csv

Log:

node backtest.js
13:41:27.190 | INFO | Using Mida 2023.1.2
Start Account Balance: 100000
Price is 15490.551
13:41:27.416 | INFO | Order 19e3c60f-452d-483f-8205-5413d6c930c3 | Status changed from requested to accepted
13:41:27.418 | INFO | Position e4d1e1ac-9cf6-4b9c-8377-1fc6ec27dc9f | Trade 7bd42c85-d03b-4531-9c0b-b7807da41295 executed
13:41:27.419 | INFO | Order 19e3c60f-452d-483f-8205-5413d6c930c3 | Trade 7bd42c85-d03b-4531-9c0b-b7807da41295 executed
13:41:27.419 | INFO | Order 19e3c60f-452d-483f-8205-5413d6c930c3 | Status changed from accepted to executed
Account Balance After Sell: 101548.9551
Price after 5 hour elapsed: 15439.931
End Account Balance: 101548.9551

I am wondering why end balance is not 51 pips * the volume

[Vasile-Peste]

Hello, you should set lotUnits to 1 and not 0. The lot units indicates how many units of the assets you can buy with 1 lot.

For Forex, usually 1 lot EUR equals to 100.000EUR.
For Contracts and Crypto usually 1 lot equals 1 unit, so 1 lot of BTC is 1 BTC.
If you set it to zero it's as you are buying/selling nothing.

Can you try and let me know? Thank you!

[hmpmarketing]

@Vasile-Peste

const symbolParameters = {
symbol: "GER40",
baseAsset: "USD",
quoteAsset: "USD",
description: "",
leverage: decimal(),
minLots: decimal(1),
maxLots: decimal(1),
lotUnits: 1,
pipPosition: -1,
digits: 2,
};

Seems to get the same result:

Log:

Start Account Balance: 100000
Price is 15490.551
16:0:5.69 | INFO | Order fee6c417-75b7-493c-ac2b-d56a9083ba90 | Status changed from requested to accepted
16:0:5.71 | INFO | Position 208a9376-255a-4225-afd2-34990baf258b | Trade ec8672ab-4650-4d21-a922-56f223fc9f26 executed
16:0:5.72 | INFO | Order fee6c417-75b7-493c-ac2b-d56a9083ba90 | Trade ec8672ab-4650-4d21-a922-56f223fc9f26 executed
16:0:5.72 | INFO | Order fee6c417-75b7-493c-ac2b-d56a9083ba90 | Status changed from accepted to executed
Account Balance After Sell: 101548.9551
Price after 5 hour elapsed: 15439.931
End Account Balance: 101548.9551

[hmpmarketing]

@Vasile-Peste FYI, I am trying to simulate trading with index CFDs. So that when you buy lets say $1 stake size (volume), a move of the price is 50 points on your direction, if you are buying/going long would mean a profit of $50

[Vasile-Peste]

I understand now, in that case, it's very simple. This is a simulator of a trading engine, there is no concept of CFD/short selling. We just buy/sell assets, so when you check your balance at the end, you just have to buy back the GER40 that you sold.

await myAccount.placeOrder({
    symbol: "GER40",
    direction: MidaOrderDirection.BUY,
    volume: 0.1,
});

Why? When you place the sell order, you are just exchanging 0.1 GER40 for USD at market price.
This means that 0.1 GER40 is deducted from your balance and the equivalent of USD value is added.

Now to check the profit after the price has changed you have to buy the 0.1 GER40 back, to get the portfolio to the initial state, so the USD balance can be deducted as the position will close.

In that case the P/L would be: (open price - close price) * volume * lotSize = (15462.951 - 15445.401) * 0.1 * 1 = 1.7549999999999273
With an end balance of 100001.755 USD started with 100000 USD.

Let me know if it's clear, thank you!

[hmpmarketing]

Hi @Vasile-Peste

So this is my code now:

const symbolParameters = {
    symbol: "GER40",
    baseAsset: "USD",
    quoteAsset: "USD",
    description: "",
    leverage: decimal(),
    minLots: decimal(1),
    maxLots: decimal(1),
    lotUnits: 0.1,
    pipPosition: -1,
    digits: 2,
};

const stake_size = 5;


  const rawPeriods = await readPeriodCsv("periods.csv")

  const engine = new MidaPlaygroundEngine({
      localDate: date("2023-03-10T00:00:00.000Z"),
  });

  await engine.addSymbolPeriods("GER40",rawPeriods)

  const myAccount = await engine.createAccount({
      id:"my-test-account",
      balanceSheet: {
          "USD": 0,
      },
  });
  await myAccount.addSymbol(symbolParameters)
  await myAccount.deposit("USD",10000)

  console.log(`Start Account Balance: ${await myAccount.getBalance()}`)

  await engine.elapseTime(300); 

  console.log(`Price is ${await engine.getSymbolBid("GER40")}`)

  await myAccount.placeOrder({
      symbol: "GER40",
      direction: MidaOrderDirection.SELL,
      volume: stake_size,
  });

  console.log(`Account Balance After Sell: ${await myAccount.getBalance()}`)

  await engine.elapseTime(18000); 

  console.log(`Price after 5 hour elapsed: ${await engine.getSymbolBid("GER40")}`)

  await myAccount.placeOrder({
      symbol: "GER40",
      direction: MidaOrderDirection.BUY,
      volume: stake_size,
  });

  console.log(`End Account Balance: ${await myAccount.getBalance()}`)

Log:

16:23:6.898 | INFO | Using Mida 2023.1.2
Start Account Balance: 10000
Price is 15490.551
16:23:7.122 | INFO | Order 57fa4368-5bca-42b2-9ba6-2ff8ff0c0123 | Status changed from requested to accepted
16:23:7.124 | INFO | Position ca9d04ba-6c5a-419f-ba5d-957c2efc8c94 | Trade 97eb76bd-33b9-4039-8ebe-36097972f8d3 executed
16:23:7.125 | INFO | Order 57fa4368-5bca-42b2-9ba6-2ff8ff0c0123 | Trade 97eb76bd-33b9-4039-8ebe-36097972f8d3 executed
16:23:7.125 | INFO | Order 57fa4368-5bca-42b2-9ba6-2ff8ff0c0123 | Status changed from accepted to executed
Account Balance After Sell: 87447.755
Price after 5 hour elapsed: 15439.931
16:23:7.154 | INFO | Order 2220cfa8-aa5c-49a9-aabf-f5d11ccebbe2 | Status changed from requested to accepted
16:23:7.155 | INFO | Position bad703fc-78af-4c55-a503-41d3d7df2a6a | Trade 1eedb442-651b-4899-91c9-a81e955c9124 executed
16:23:7.155 | INFO | Order 2220cfa8-aa5c-49a9-aabf-f5d11ccebbe2 | Trade 1eedb442-651b-4899-91c9-a81e955c9124 executed
16:23:7.155 | INFO | Order 2220cfa8-aa5c-49a9-aabf-f5d11ccebbe2 | Status changed from accepted to executed
End Account Balance: 10253.1

So this is what I am expecting. However when I do the opposite (Buy then Sell) I would expect a loss as the price went down, I would expect to lose 253.1 so the end balance would be 9746.9 however I get "Not Enough Money"

16:28:32.212 | INFO | Using Mida 2023.1.2
Start Account Balance: 10000
Price is 15490.551
16:28:32.429 | INFO | Order 70cab825-5775-4bd3-ba8e-5476228ff9fb | Status changed from requested to accepted
16:28:32.430 | INFO | Order 70cab825-5775-4bd3-ba8e-5476228ff9fb | Status changed from accepted to rejected
16:28:32.431 | WARN | Playground | Order 70cab825-5775-4bd3-ba8e-5476228ff9fb rejected: not-enough-money
Account Balance After Sell: 10000
Price after 5 hour elapsed: 15439.931
16:28:32.455 | INFO | Order b5a9239a-1d78-4f07-92dc-f5492182a1ed | Status changed from requested to accepted
16:28:32.457 | INFO | Position 450ea932-d658-45a0-b01e-9afe8aa52dd8 | Trade 35385703-57d1-4c95-8e9d-56f14487d8b0 executed
16:28:32.457 | INFO | Order b5a9239a-1d78-4f07-92dc-f5492182a1ed | Trade 35385703-57d1-4c95-8e9d-56f14487d8b0 executed
16:28:32.458 | INFO | Order b5a9239a-1d78-4f07-92dc-f5492182a1ed | Status changed from accepted to executed
End Account Balance: 87194.655

Not sure what I am missing.

[fgnm]

@hmpmarketing I've the same issue, have you found a solution?

[hmpmarketing]

@fgnm nope, waiting if @Vasile-Peste can shed a light

[fgnm]

@hmpmarketing got the trick... I'm testing ETHUSD, this should be the correct way to setup backtest account

    const myAccount = await engine.createAccount({
        balanceSheet: {
            "USD": 100_000, // Start with 100.000 USD
        },
    });
    await myAccount.deposit("ETH", 32);

I was missing the await myAccount.deposit("ETH", 32);, so the engine was unable to execute the SELL orders because indeed the ETH wallet was at 0 producing not-enough-money exception.

Cheers 😉