mongo aggregate paginate

 Account.aggregate([
    {$unwind: {path: "$tokens"}},
    {$match:{ "tokens.tokenId": tokenId }},
    {$project: {
      address: 1,  
      balance:{
        $reduce: {
          input: "$tokens.transactions",
          initialValue: 0,
          in: { $add:["$$value", "$$this.amount" ]}
        }
      }}},
    {$group: {
      _id: 0,
      count: {
          $sum: 1
      },
      document: {
          $push: "$$ROOT"
      }
    }},
    {$unwind: "$document"},
    {$sort: {"document.balance": -1}},
    {$skip: (page-1)*limit},
    {$limit: limit}
  ])