1. Square
  2. HFT high frequency order flow factor

HFT high frequency order flow factor

Author: Inventors quantified, Date: 2022-12-04 00:22:04
Tags:

An entry-level order flow high-frequency alpha factor, which can be used as a reference for the optimal buy-sell pricing distance of the marketer's strategy, signals are categorized as [-1, 1], trend 1 represents the buyer market, trend -1 is the seller market, the strategy will map the factor value and the final transaction price in real time. The strategy uses OKX and the Binance futures websocket interface to receive computations, the following graph is an indicator effect, which can be seen to have some effectiveness, open to high-frequency input quantification hobbyists

img

let _chart = Chart({
    subtitle: {
        text: "Market Status",
    },
    yAxis: [{
        height: "60%",
        lineWidth: 1,
        title: {
            text: 'Close',
        },
        opposite: true,
        labels: {
            align: "right",
            x: -3,
        }
    }, {
        title: {
            text: 'Alpha',
        },
        top: "60%",
        height: "20%",
        offset: 0,
        lineWidth: 1
    }, {
        title: {
            text: 'Vol',
        },
        top: "80%",
        height: "20%",
        offset: 0,
        lineWidth: 1
    }],

    series: [{
        name: 'Last',
        lineWidth: 1,
        data: [],
        id: 'primary',
        tooltip: {
            xDateFormat: '%Y-%m-%d %H:%M:%S'
        },
        yAxis: 0
    }, {
        type: 'column',
        lineWidth: 2,
        name: 'Alpha',
        data: [],
        yAxis: 1,
        color: 'green',
        zones: [{
            value: 0,
            color: 'red'
        }]
    }, {
        lineWidth: 1,
        type: 'area',
        color: '#257ed4',
        name: 'Vol',
        data: [],
        yAxis: 2
    }],
})

function calc_alpha(trades) {
    let tick_sell_vol = 0
    let tick_buy_vol = 0
    let last_buy_vol = 0
    let last_sell_vol = 0
    let rightPos = Math.ceil(trades.length * 0.382)
    trades.forEach(function(trade, idx) {
        if (trade.side == 'buy') {
            if (idx >= rightPos) {
                last_buy_vol += trade.qty
            }
            tick_buy_vol += trade.qty
        } else {
            if (idx >= rightPos) {
                last_sell_vol += trade.qty
            }
            tick_sell_vol += trade.qty
        }
    })

    let tanh = function(x) {
        // return [-1, 1]
        return (Math.exp(x) - Math.exp(-x)) / (Math.exp(x) + Math.exp(-x))
    }

    let positive_ratio = last_buy_vol / tick_sell_vol
    let negative_ratio = last_sell_vol / tick_buy_vol
    let trade_ratio = 0
    if (positive_ratio > negative_ratio) {
        trade_ratio = tanh(positive_ratio)
    } else {
        trade_ratio = tanh(-negative_ratio)
    }
    return _N(trade_ratio, 3)
}

let _trades = []
let _vol = 0

function onTick(ctx, event) {
    if (event.trades) {
        event.trades.forEach(function(trade) {
            _vol += trade.qty
            _trades.push(trade)
            if (_trades.length > QSize) {
                _trades.shift()
            }
        })
        if (_trades.length >= QSize) {
            let val = calc_alpha(_trades)
            _chart.add(0, [event.ts, _trades[_trades.length-1].price])
            _chart.add(1, [event.ts, val])
            _chart.add(2, [event.ts, _vol])
            _vol = 0
        }
    }
}

function main() {
    _chart.reset()
    let ct = exchange.SetContractType("swap")
    let debug = false
    let useMargin = false
    let okxAccessKey = ""
    let okxPhrase = ""
    let ctx = $.NewWSS(exchange, function(ws, e) {
        let msg = null
        if (e.GetName() == 'Futures_OKCoin') {
            msg = {
                op: "subscribe",
                args: []
            }
            let instId = ct.InstrumentID
            msg.args.push({
                channel: "books5",
                instId: instId
            })
            msg.args.push({
                channel: "trades",
                instId: instId
            })
        } else {
            msg = {
                method: "SUBSCRIBE",
                params: [],
                id: "1"
            }
            let symbol = e.GetCurrency().replace('_', '').toLowerCase()
            msg.params.push(symbol + "@aggTrade")
            msg.params.push(symbol + "@depth20@100ms")
        }
        ws.write(JSON.stringify(msg))
        Log("subscribe", msg, "channel")
        LogStatus("Ready")
    }, onTick, debug, useMargin, okxAccessKey, okxPhrase)

    while (true) {
        ctx.poll()
        EventLoop(1000)
    }
}
More

2019 FMZ - All rights reserved