策略原理

由于流动性原因，当市场出现大额砸盘拉盘时必然会出现大额价格波动，交易所之间就会形成瞬间的价差，策略就是要捕捉这些瞬间执行快速交易完成低买高卖的过程。
有客户问我为啥要弄那么多交易所，这个是必然的，我们赚的是交易所之间的瞬时价差，交易所越多，交叉之后所形成的价差机会肯定越多。

策略核心逻辑

1. 并发获取多交易所盘口信息，一定要并发获取，减少获取到的盘口延迟，并发获取可以参考我分享的工具插件多交易所并发插件
2. 将所有交易所盘口的ask跟bid合并，得到一个合并的盘口信息,其中RealPrice是扣除手续费后的价格，

            
            
            
function createOrders(depths, askOrders, bidOrders) {
    let asksIndex = 0;
    let bidIndex = 0;
    for (let i = 0; i < depths.length; i++) {
        let exchangeTariff = getExchangeTariff(i);
        let asks = depths[i].Asks;
        let bids = depths[i].Bids;
        for (let j = 0; j < Math.min(asks.length, bids.length, 20); j++) {
            if (asks[j].Amount >= minTakerAmount) {
                askOrders[asksIndex] = {
                    "Price": asks[j].Price,
                    "Amount": asks[j].Amount,
                    "Fee": asks[j].Price * exchangeTariff,
                    "RealPrice": asks[j].Price * (1 + exchangeTariff),
                    "Index": i,
                };
                asksIndex++;
            }
            if (bids[j].Amount >= minTakerAmount) {
                bidOrders[bidIndex] = {
                    "Price": bids[j].Price,
                    "Amount": bids[j].Amount,
                    "Fee": bids[j].Price * exchangeTariff,
                    "RealPrice": bids[j].Price * (1 - exchangeTariff),
                    "Index": i,
                };
                bidIndex++;
            }
        }
    }
    askOrders.sort(function (a, b) {
        return a.RealPrice - b.RealPrice;
    });
    bidOrders.sort(function (a, b) {
        return b.RealPrice - a.RealPrice;
    });
}

3. 从合并的盘口信息，计算出最有的套利差价。由于我们是吃单，即从最低价ask买入，从最高价bid卖出，只要bid.RealPrice > ask.RealPrice即有盈利空间

            
            
            
function getArbitrageOrders(askOrders, bidOrders) {
    let ret = [];
    for (let i = 0; i < askOrders.length; i++) {
        for (let j = 0; j < bidOrders.length; j++) {
            let bidOrder = bidOrders[j];
            let askOrder = askOrders[i];
            if (bidOrder.Index === askOrder.Index) {
                continue
            }
            let minMigrateDiffPrice = ((askOrder.Price + bidOrder.Price) / 2 * minMigrateDiffPricePercent / 100);
            if (bidOrder.RealPrice - askOrder.RealPrice > minMigrateDiffPrice) {
                ret.push({
                    "Ask": askOrder,
                    "Bid": bidOrder,
                })
            }
        }
    }
    if (ret.length === 0) {
        ret.push({
            "Ask": askOrders[0],
            "Bid": bidOrders[0],
        });
    }
    //按最优价差排序
    ret.sort((a, b) => {
        return (b.Bid.RealPrice - b.Ask.RealPrice) - (a.Bid.RealPrice - a.Ask.RealPrice);
    });
    return ret;
}

4. 到了这里我们已经获取到市场中的可套利价差信息，那么怎么取舍是否执行交易，以及交易多少数量，这里有几个判断要点：

• 当前剩余的资产
• 价差大小（价差太小就只均衡货币数量，价差够大才最大化交易数量）
• 盘口挂单数量

            
            
            
    var askOrder = arbitrageOrder.Ask;
    var bidOrder = arbitrageOrder.Bid;
    var perAmountFee = arbitrageOrder.Ask.Fee + arbitrageOrder.Bid.Fee;
    var minRealDiffPrice = (askOrder.Price + bidOrder.Price) / 2 * minDiffPricePercent / 100;
    var minMigrateDiffPrice = ((askOrder.Price + bidOrder.Price) / 2 * minMigrateDiffPricePercent / 100);
    var curRealDiffPrice = arbitrageOrder.Bid.RealPrice - arbitrageOrder.Ask.RealPrice;
    var buyExchange = exchanges[arbitrageOrder.Ask.Index];
    var sellExchange = exchanges[arbitrageOrder.Bid.Index];
    var buySellAmount = 0;
    if (curRealDiffPrice > minRealDiffPrice) {
        buySellAmount = math.min(
            bidOrder.Amount,
            askOrder.Amount,
            maxTakerAmount,
            runningInfo.Accounts[bidOrder.Index].CurStocks,
            runningInfo.Accounts[askOrder.Index].CurBalance / askOrder.Price
        );
    } else if (bidOrder.Index !== askOrder.Index) {
        if (migrateCoinEx == -1) {
            if (curRealDiffPrice > minMigrateDiffPrice && runningInfo.Accounts[bidOrder.Index].CurStocks - runningInfo.Accounts[askOrder.Index].CurStocks > maxAmountDeviation) {
                buySellAmount = math.min(
                    bidOrder.Amount,
                    askOrder.Amount,
                    maxTakerAmount,
                    runningInfo.Accounts[bidOrder.Index].CurStocks,
                    runningInfo.Accounts[askOrder.Index].CurBalance / askOrder.Price,
                    runningInfo.Accounts[bidOrder.Index].CurStocks - ((runningInfo.Accounts[bidOrder.Index].CurStocks + runningInfo.Accounts[askOrder.Index].CurStocks) / 2)
                );
                if (buySellAmount >= minTakerAmount) {
                    Log("启动交易所平衡！");
                }
            }
        } else if (migrateCoinEx == askOrder.Index) {
            if (curRealDiffPrice > minMigrateDiffPrice && runningInfo.Accounts[bidOrder.Index].CurStocks > 0) {
                buySellAmount = math.min(
                    bidOrder.Amount,
                    askOrder.Amount,
                    maxTakerAmount,
                    runningInfo.Accounts[bidOrder.Index].CurStocks,
                    runningInfo.Accounts[askOrder.Index].CurBalance / askOrder.Price
                );
                if (buySellAmount >= minTakerAmount) {
                    Log("启动货币迁移:", exchanges[bidOrder.Index].GetName(), "-->", exchanges[askOrder.Index].GetName());
                }
            }
        }
    }

5. 计算得到下单数量即可执行交易，策略采用直接加滑点吃单的方式同时下单

            
            
            
            var buyWait = buyExchange.Go("Buy", _N(askOrder.Price * (1.01), pricePrecision), buySellAmount);
            var sellWait = sellExchange.Go("Sell", _N(bidOrder.Price * (0.99), pricePrecision), buySellAmount);
            var startWaitTime = new Date().getTime()
            Sleep(3000);
            var buyOrder = buyWait.wait()
            var sellOrder = sellWait.wait()

6. 剩下的就是计算收益，处理失败订单止损之类的逻辑了。

本策略实战收益

当前实盘展示，核心逻辑不变，优化支持多币种

https://www.fmz.com/robot/464965

最后，欢迎加入老秋量化交流：https://t.me/laoqiu_arbitrage