async nextPrice (fixedIntervalPriceId: string, nextPrice: string, timeout: number = 30000): Promise<void> {
    return await waitForCondition(async () => {
      const data: any = await this.sncc.rpc.call('getfixedintervalprice', [fixedIntervalPriceId])
      // eslint-disable-next-line
      if (data.nextPrice.toString() !== nextPrice) {