Phemex: evaluate posSide in fetchMyTrades() and fetch_orders() about ccxt

[egabosh]

Don't understand the CCXT code completely but looks like posSide is evaluated only if it is set to "Merged" in "python/ccxt/async_support/phemex.py"

[egabosh]

In Phemex WebUI "Contract History -> Trade History" it is called "Direction":

[carlosmiei]

Hello @egabosh, I think we discussed this earlier, the positionSide differs from the trade/order side.

[egabosh]

Moin @carlosmiei . I understand your point but my problem is that I have no idea how I can find out with CCXT if it is a long or a short trade.
Do you have an idea?

[carlosmiei]

@egabosh You can infer the direction using the posSide

For instance, if you fetch trades after opening/increase/decrease a position, depending on the positionMode

one way-mode (does not really matter because there's only one side)

• Open long position:
  • 'posSide:3' and side = buy
• Increase long position
  • 'posSide:3' and side = buy
• Decrease long position
  • posSide: '3' and side = sell

hedged-mode

• Open long position
  • posSide = 1, side = buy
• Increase long position
  • posSide = 1, side = buy
• Decrease long position
  • posSide = 1, side = sell # the posSide is = 1 = 'Long' but the side is sell which means you decreased your long exposure

[egabosh]

Moin @carlosmiei,

maybe I misunderstood something but posSide is only under info{} and I understood that we should not use the area in info{} because it is directly values from the exchange and therefore not uniform for each exchange.
That's why I wanted to include it in the CCXT interpreted area.
If there is posSide under info for every exchange and it is best practice to use the value in this way, the problem would be solved for me and I have misunderstood the info area.

Example output here:

    "info": {
      "createdAt": "1714990724076",
      "symbol": "BTCUSDT",
      "currency": "USDT",
      "action": "1",
      "tradeType": "1",
      "execQtyRq": "0.003",
      "execPriceRp": "64935",
      "side": "2",
      "orderQtyRq": "0.003",
      "priceRp": "51600",
      "execValueRv": "194.805",
      "feeRateRr": "0.000495",
      "execFeeRv": "0",
      "ordType": "3",
      "execId": "XXXXXX",
      "execStatus": "7",
      "posSide": "1",
      "ptFeeRv": "0.110012249248",
      "ptPriceRp": "0.876524893"
    },
    "id": "XXXXXX",
    "symbol": "BTC/USDT:USDT",
    "timestamp": 1714990724076,
    "datetime": "2024-05-06T10:18:44.076Z",
    "order": null,
    "type": null,
    "side": "sell",
    "takerOrMaker": null,
    "price": 64935,
    "amount": 0.003,
    "cost": 194.805,
    "fee": {
      "cost": 0.110012249248,
      "rate": 0.000495,
      "currency": "PT"
    },
    "fees": [
      {
        "cost": 0.110012249248,
        "rate": 0.000495,
        "currency": "PT"
      }
    ]
  },

[carlosmiei]

@egabosh You're right, the values inside info are exchange-specific and will differ from exchange to exchange but unfortunately I don't think there is a way of doing that in a unified way.

[egabosh]

@carlosmiei OK, thanks. At least I've understood that correctly :-)
Is there a reason why this is not possible in a unified way?
It should be similarly visible on other exchanges, right?

[carlosmiei]

@egabosh Usually we unify behaviors when we detect a pattern across different exchanges, which is not the case here, at least yet.

[egabosh]

@carlosmiei OK, that makes it easier for me to understand.
Wouldn't it be possible to provide this for the exchanges where it is possible?

[untoreh]

@egabosh You can infer the direction using the posSide

For instance, if you fetch trades after opening/increase/decrease a position, depending on the positionMode

one way-mode (does not really matter because there's only one side)

* Open long position:
  
  * 'posSide:3' and side = buy

* Increase long position
  
  * 'posSide:3' and side = buy

* Decrease long position
  
  * posSide: '3' and side = sell

hedged-mode

* Open long position
  
  * posSide = 1, side = buy

* Increase long position
  
  * posSide = 1, side = buy

* Decrease long position
  
  * posSide = 1, side = sell # the posSide is = 1 = 'Long' but the side is `sell` which means you decreased your long exposure

In merged/oneway mode:
Let's say I am only syncing the last 10 trades, without knowing the position side of the order I would need to know the position state at the date of the first of the 10 trades...after which I can keep track of when the position switches side, so even with posSide it's not possible to reliably reconstruct the position history on phemex

[egabosh]

In merged/oneway mode: Let's say I am only syncing the last 10 trades, without knowing the position side of the order I would need to know the position state at the date of the first of the 10 trades...after which I can keep track of when the position switches side, so even with posSide it's not possible to reliably reconstruct the position history on phemex

Is this a problem only with phemex or do we have the same issue on other exchanges too?