getSimOrderbook

const book = await client.getSimOrderbook({
  pairId: 0,
  levels: 20,
});

interface Response {
  pairId: string;
  pairFrom: string;
  pairTo: string;
  levels: [
    Array<{ px: string; sz: string; n: number }>,
    Array<{ px: string; sz: string; n: number }>
  ];
  time: number;
}