private function tickerStreamHandler(\stdClass $json)
    {
        return [
            "eventType" => $json->e,
            "eventTime" => $json->E,
            "symbol" => $json->s,
            "priceChange" => $json->p,
            "percentChange" => $json->P,
            "averagePrice" => $json->w,
            "prevClose" => $json->x,
            "close" => $json->c,
            "closeQty" => $json->Q,
            "bestBid" => $json->b,
            "bestBidQty" => $json->B,
            "bestAsk" => $json->a,
            "bestAskQty" => $json->A,
            "open" => $json->o,
            "high" => $json->h,
            "low" => $json->l,
            "volume" => $json->v,
            "quoteVolume" => $json->q,
            "openTime" => $json->O,
            "closeTime" => $json->C,
            "firstTradeId" => $json->F,
            "lastTradeId" => $json->L,
            "numTrades" => $json->n,
        ];
    }