diff --git a/piker/data/feed.py b/piker/data/feed.py
index 88d2a386..1714cf19 100644
--- a/piker/data/feed.py
+++ b/piker/data/feed.py
@@ -907,7 +907,7 @@ async def open_feed(
 
                 for fqme, flume_msg in flumes_msg_dict.items():
                     flume = Flume.from_msg(flume_msg)
-                    # assert flume.symbol.fqme == fqme
+                    # assert flume.mkt.fqme == fqme
                     feed.flumes[fqme] = flume
 
                     # TODO: do we need this?
diff --git a/piker/ui/_chart.py b/piker/ui/_chart.py
index 13ec23c3..b2da3fa2 100644
--- a/piker/ui/_chart.py
+++ b/piker/ui/_chart.py
@@ -68,7 +68,10 @@ from ..data.feed import (
     Feed,
     Flume,
 )
-from ..accounting._mktinfo import Symbol
+from ..accounting import (
+    MktPair,
+    Symbol,
+)
 from ..log import get_logger
 from ._interaction import ChartView
 from ._forms import FieldsForm
@@ -287,7 +290,7 @@ class GodWidget(QWidget):
                     pp_nav.hide()
 
         # set window titlebar info
-        symbol = self.rt_linked.symbol
+        symbol = self.rt_linked.mkt
         if symbol is not None:
             self.window.setWindowTitle(
                 f'{symbol.fqme} '
@@ -452,7 +455,7 @@ class LinkedSplits(QWidget):
         # update the UI for a given "chart instance".
         self.display_state: DisplayState | None = None
 
-        self._symbol: Symbol = None
+        self._mkt: MktPair | Symbol = None
 
     def on_splitter_adjust(
         self,
@@ -474,9 +477,20 @@ class LinkedSplits(QWidget):
                 **kwargs,
             )
 
+    def set_mkt_info(
+        self,
+        mkt: MktPair,
+    ) -> None:
+        self._mkt = mkt
+
     @property
-    def symbol(self) -> Symbol:
-        return self._symbol
+    def mkt(self) -> MktPair:
+        return self._mkt
+
+    @property
+    def symbol(self) -> Symbol | MktPair:
+        log.warning(f'{type(self)}.symbol is now deprecated use .mkt!')
+        return self.mkt
 
     def set_split_sizes(
         self,
@@ -521,7 +535,7 @@ class LinkedSplits(QWidget):
     def plot_ohlc_main(
         self,
 
-        symbol: Symbol,
+        mkt: MktPair,
         shm: ShmArray,
         flume: Flume,
         sidepane: FieldsForm,
@@ -540,7 +554,7 @@ class LinkedSplits(QWidget):
         # add crosshairs
         self.cursor = Cursor(
             linkedsplits=self,
-            digits=symbol.tick_size_digits,
+            digits=mkt.price_tick_digits,
         )
 
         # NOTE: atm the first (and only) OHLC price chart for the symbol
@@ -548,7 +562,7 @@ class LinkedSplits(QWidget):
         # be no distinction since we will have multiple symbols per
         # view as part of "aggregate feeds".
         self.chart = self.add_plot(
-            name=symbol.fqme,
+            name=mkt.fqme,
             shm=shm,
             flume=flume,
             style=style,
@@ -1030,7 +1044,7 @@ class ChartPlotWidget(pg.PlotWidget):
         '''
         view = vb or self.view
         viz = self.main_viz
-        l, r = viz.view_range()
+        left, right = viz.view_range()
         x_shift = viz.index_step() * datums
 
         if datums >= 300:
@@ -1040,8 +1054,8 @@ class ChartPlotWidget(pg.PlotWidget):
 
         # should trigger broadcast on all overlays right?
         view.setXRange(
-            min=l + x_shift,
-            max=r + x_shift,
+            min=left + x_shift,
+            max=right + x_shift,
 
             # TODO: holy shit, wtf dude... why tf would this not be 0 by
             # default... speechless.
@@ -1227,7 +1241,7 @@ class ChartPlotWidget(pg.PlotWidget):
                 # if the sticky is for our symbol
                 # use the tick size precision for display
                 name = name or pi.name
-                sym = self.linked.symbol
+                sym = self.linked.mkt
                 digits = None
                 if name == sym.key:
                     digits = sym.tick_size_digits
diff --git a/piker/ui/_cursor.py b/piker/ui/_cursor.py
index 83986762..0a2c82b1 100644
--- a/piker/ui/_cursor.py
+++ b/piker/ui/_cursor.py
@@ -228,7 +228,7 @@ class ContentsLabel(pg.LabelItem):
                         'bar_wap',
                     ]
                 ],
-                name=name,
+                # name=name,
                 index=ix,
             )
         )
@@ -363,7 +363,7 @@ class Cursor(pg.GraphicsObject):
 
         # value used for rounding y-axis discreet tick steps
         # computing once, up front, here cuz why not
-        mkt = self.linked._symbol
+        mkt = self.linked.mkt
         self._y_tick_mult = 1/float(mkt.price_tick)
 
         # line width in view coordinates
diff --git a/piker/ui/_dataviz.py b/piker/ui/_dataviz.py
index 721483e1..a24c7d5c 100644
--- a/piker/ui/_dataviz.py
+++ b/piker/ui/_dataviz.py
@@ -436,12 +436,12 @@ class Viz(Struct):
         else:
             if x_range is None:
                 (
-                    l,
+                    xl,
                     _,
                     lbar,
                     rbar,
                     _,
-                    r,
+                    xr,
                 ) = self.datums_range()
 
                 profiler(f'{self.name} got bars range')
@@ -585,12 +585,12 @@ class Viz(Struct):
         Return a range tuple for the datums present in view.
 
         '''
-        l, r = view_range or self.view_range()
+        xl, xr = view_range or self.view_range()
 
         index_field: str = index_field or self.index_field
         if index_field == 'index':
-            l: int = round(l)
-            r: int = round(r)
+            xl: int = round(xl)
+            xr: int = round(xr)
 
         if array is None:
             array = self.shm.array
@@ -601,12 +601,12 @@ class Viz(Struct):
 
         # invalid view state
         if (
-            r < l
-            or l < 0
-            or r < 0
+            xr < xl
+            or xl < 0
+            or xr < 0
             or (
-                l > last
-                and r > last
+                xl > last
+                and xr > last
             )
         ):
             leftmost: int = first
@@ -616,12 +616,12 @@ class Viz(Struct):
             # determine first and last datums in view determined by
             # l -> r view range.
             rightmost = max(
-                min(last, ceil(r)),
+                min(last, ceil(xr)),
                 first,
             )
 
             leftmost = min(
-                max(first, floor(l)),
+                max(first, floor(xl)),
                 last,
                 rightmost - 1,
             )
@@ -632,12 +632,12 @@ class Viz(Struct):
         self.vs.xrange = leftmost, rightmost
 
         return (
-            l,  # left x-in-view
+            xl,  # left x-in-view
             first,  # first datum
             leftmost,
             rightmost,
             last,  # last_datum
-            r,  # right-x-in-view
+            xr,  # right-x-in-view
         )
 
     def read(
@@ -665,12 +665,12 @@ class Viz(Struct):
             profiler('self.shm.array READ')
 
         (
-            l,
+            xl,
             ifirst,
             lbar,
             rbar,
             ilast,
-            r,
+            xr,
         ) = self.datums_range(
             index_field=index_field,
             array=array,
@@ -715,8 +715,8 @@ class Viz(Struct):
         # a uniform time stamp step size?
         else:
             # get read-relative indices adjusting for master shm index.
-            lbar_i = max(l, ifirst) - ifirst
-            rbar_i = min(r, ilast) - ifirst
+            lbar_i = max(xl, ifirst) - ifirst
+            rbar_i = min(xr, ilast) - ifirst
 
             # NOTE: the slice here does NOT include the extra ``+ 1``
             # BUT the ``in_view`` slice DOES..
@@ -1244,18 +1244,25 @@ class Viz(Struct):
 
         '''
         # get most recent right datum index in-view
-        l, start, datum_start, datum_stop, stop, r = self.datums_range()
+        (
+            xl,
+            start,
+            datum_start,
+            datum_stop,
+            stop,
+            xr,
+        ) = self.datums_range()
         lasts = self.shm.array[-1]
         i_step = lasts['index']  # last index-specific step.
         i_step_t = lasts['time']  # last time step.
 
-        # fqme = self.flume.symbol.fqme
+        # fqme = self.flume.mkt.fqme
 
         # check if "last (is) in view" -> is a real-time update necessary?
         if self.index_field == 'index':
-            liv = (r >= i_step)
+            liv = (xr >= i_step)
         else:
-            liv = (r >= i_step_t)
+            liv = (xr >= i_step_t)
 
         # compute the first available graphic obj's x-units-per-pixel
         # TODO: make this not loop through all vizs each time!
diff --git a/piker/ui/_display.py b/piker/ui/_display.py
index 04b363b1..c747eb31 100644
--- a/piker/ui/_display.py
+++ b/piker/ui/_display.py
@@ -37,6 +37,9 @@ import pyqtgraph as pg
 from msgspec import field
 
 # from .. import brokers
+from ..accounting import (
+    MktPair,
+)
 from ..data.feed import (
     open_feed,
     Feed,
@@ -319,8 +322,8 @@ async def graphics_update_loop(
     for fqme, flume in feed.flumes.items():
         ohlcv = flume.rt_shm
         hist_ohlcv = flume.hist_shm
-        symbol = flume.mkt
-        fqme = symbol.fqme
+        mkt = flume.mkt
+        fqme = mkt.fqme
 
         # update last price sticky
         fast_viz = fast_chart._vizs[fqme]
@@ -360,13 +363,13 @@ async def graphics_update_loop(
 
         last, volume = ohlcv.array[-1][['close', 'volume']]
 
-        symbol = flume.mkt
+        mkt = flume.mkt
 
         l1 = L1Labels(
             fast_pi,
             # determine precision/decimal lengths
-            digits=symbol.tick_size_digits,
-            size_digits=symbol.lot_size_digits,
+            digits=mkt.price_tick_digits,
+            size_digits=mkt.size_tick_digits,
         )
 
         # TODO:
@@ -449,7 +452,7 @@ async def graphics_update_loop(
                 and quote_rate >= display_rate
             ):
                 pass
-                # log.warning(f'High quote rate {symbol.key}: {quote_rate}')
+                # log.warning(f'High quote rate {mkt.fqme}: {quote_rate}')
 
             last_quote_s = time.time()
 
@@ -1224,7 +1227,7 @@ async def display_symbol_data(
         # tf_key = tf_in_1s[step_size_s]
         godwidget.window.setWindowTitle(
             f'{fqmes} '
-            # f'tick:{symbol.tick_size} '
+            # f'tick:{mkt.tick_size} '
             # f'step:{tf_key} '
         )
         # generate order mode side-pane UI
@@ -1234,8 +1237,8 @@ async def display_symbol_data(
         godwidget.pp_pane = pp_pane
 
         # create top history view chart above the "main rt chart".
-        rt_linked = godwidget.rt_linked
-        hist_linked = godwidget.hist_linked
+        rt_linked: LinkedSplits = godwidget.rt_linked
+        hist_linked: LinkedSplits = godwidget.hist_linked
 
         # NOTE: here we insert the slow-history chart set into
         # the fast chart's splitter -> so it's a splitter of charts
@@ -1279,17 +1282,17 @@ async def display_symbol_data(
 
         # TODO NOTE: THIS CONTROLS WHAT SYMBOL IS USED FOR ORDER MODE
         # SUBMISSIONS, we need to make this switch based on selection.
-        rt_linked._symbol = flume.mkt
-        hist_linked._symbol = flume.mkt
+        rt_linked.set_mkt_info(flume.mkt)
+        hist_linked.set_mkt_info(flume.mkt)
 
         ohlcv: ShmArray = flume.rt_shm
         hist_ohlcv: ShmArray = flume.hist_shm
 
-        symbol = flume.mkt
-        fqme = symbol.fqme
+        mkt: MktPair = flume.mkt
+        fqme = mkt.fqme
 
         hist_chart = hist_linked.plot_ohlc_main(
-            symbol,
+            mkt,
             hist_ohlcv,
             flume,
             # in the case of history chart we explicitly set `False`
@@ -1311,7 +1314,7 @@ async def display_symbol_data(
         hist_linked.cursor.always_show_xlabel = False
 
         rt_chart = rt_linked.plot_ohlc_main(
-            symbol,
+            mkt,
             ohlcv,
             flume,
             # in the case of history chart we explicitly set `False`
@@ -1378,8 +1381,8 @@ async def display_symbol_data(
                 ohlcv: ShmArray = flume.rt_shm
                 hist_ohlcv: ShmArray = flume.hist_shm
 
-                symbol = flume.mkt
-                fqme = symbol.fqme
+                mkt = flume.mkt
+                fqme = mkt.fqme
 
                 hist_pi = hist_chart.overlay_plotitem(
                     name=fqme,
diff --git a/piker/ui/_fsp.py b/piker/ui/_fsp.py
index f942ff14..b4aa2b10 100644
--- a/piker/ui/_fsp.py
+++ b/piker/ui/_fsp.py
@@ -29,7 +29,6 @@ from typing import (
     Any,
 )
 
-import numpy as np
 import msgspec
 import tractor
 import pyqtgraph as pg
@@ -428,7 +427,7 @@ class FspAdmin:
                     in self._flow_registry.items()
                 ],
 
-            ) as (ctx, last_index),
+            ) as (ctx, _),
             ctx.open_stream() as stream,
         ):
 
@@ -486,8 +485,10 @@ class FspAdmin:
             readonly=True,
         )
 
-        portal = self.cluster.get(worker_name) or self.rr_next_portal()
-        provider_tag = portal.channel.uid
+        portal: tractor.Portal = (
+            self.cluster.get(worker_name)
+            or self.rr_next_portal()
+        )
 
         # TODO: this should probably be turned into a
         # ``Cascade`` type which describes the routing
diff --git a/piker/ui/_position.py b/piker/ui/_position.py
index 59ab434d..a2e6c19e 100644
--- a/piker/ui/_position.py
+++ b/piker/ui/_position.py
@@ -45,7 +45,10 @@ from ..calc import (
     pnl,
     puterize,
 )
-from ..accounting._allocate import Allocator
+from ..accounting import (
+    Allocator,
+    MktPair,
+)
 from ..accounting import (
     Position,
 )
@@ -244,7 +247,7 @@ class SettingsPane:
             # a ``brokerd`) then error and switch back to the last
             # selection.
             if tracker is None:
-                sym = old_tracker.charts[0].linked.symbol.key
+                sym: str = old_tracker.charts[0].linked.mkt.fqme
                 log.error(
                     f'Account `{account_name}` can not be set for {sym}'
                 )
@@ -415,9 +418,10 @@ class SettingsPane:
 
         '''
         mode = self.order_mode
-        sym = mode.chart.linked.symbol
+        mkt: MktPair = mode.chart.linked.mkt
         size = tracker.live_pp.size
-        flume: Feed = mode.feed.flumes[sym.fqme]
+        fqme: str = mkt.fqme
+        flume: Feed = mode.feed.flumes[fqme]
         pnl_value = 0
 
         if size:
@@ -430,7 +434,6 @@ class SettingsPane:
 
             # maybe start update task
             global _pnl_tasks
-            fqme = sym.fqme
             if fqme not in _pnl_tasks:
                 _pnl_tasks[fqme] = True
                 self.order_mode.nursery.start_soon(
@@ -555,7 +558,7 @@ class Nav(Struct):
 
         '''
         for key, chart in self.charts.items():
-            size_digits = size_digits or chart.linked.symbol.lot_size_digits
+            size_digits = size_digits or chart.linked.mkt.size_tick_digits
             line = self.lines.get(key)
             level_marker = self.level_markers[key]
             pp_label = self.pp_labels[key]
diff --git a/piker/ui/_signalling.py b/piker/ui/_signalling.py
index 13bc2fc8..c952b49d 100644
--- a/piker/ui/_signalling.py
+++ b/piker/ui/_signalling.py
@@ -23,7 +23,10 @@ WARNING: this code likely doesn't work at all (yet)
 """
 import numpy as np
 import pyqtgraph as pg
-from PyQt5 import QtCore, QtGui, QtWidgets
+from PyQt5 import (
+    QtCore,
+    QtWidgets,
+)
 
 from .quantdom.charts import CenteredTextItem
 from .quantdom.base import Quotes
diff --git a/piker/ui/order_mode.py b/piker/ui/order_mode.py
index 44558251..21f7bd22 100644
--- a/piker/ui/order_mode.py
+++ b/piker/ui/order_mode.py
@@ -36,17 +36,18 @@ import trio
 from PyQt5.QtCore import Qt
 
 from .. import config
-from ..accounting import Position
-from ..accounting._allocate import (
+from ..accounting import (
+    Allocator,
+    Position,
     mk_allocator,
+    MktPair,
+    Symbol,
 )
 from ..clearing._client import (
     open_ems,
     OrderClient,
 )
 from ._style import _font
-from ..accounting._mktinfo import Symbol
-from ..accounting import MktPair
 from ..data.feed import (
     Feed,
     Flume,
@@ -93,7 +94,7 @@ class Dialog(Struct):
     order: Order
     symbol: str
     lines: list[LevelLine]
-    last_status_close: Callable = lambda: None
+    last_status_close: Callable | None = None
     msgs: dict[str, dict] = {}
     fills: dict[str, Any] = {}
 
@@ -288,10 +289,10 @@ class OrderMode:
             # since that's illogical / a no-op.
             return
 
-        symbol = self.chart.linked.symbol
+        mkt: MktPair = self.chart.linked.mkt
 
         # NOTE : we could also use instead,
-        # symbol.quantize(price, quantity_type='price')
+        # mkt.quantize(price, quantity_type='price')
         # but it returns a Decimal and it's probably gonna
         # be slower?
         # TODO: should we be enforcing this precision
@@ -301,7 +302,7 @@ class OrderMode:
 
         price = round(
             price,
-            ndigits=symbol.tick_size_digits,
+            ndigits=mkt.size_tick_digits,
         )
 
         order = self._staged_order = Order(
@@ -309,8 +310,8 @@ class OrderMode:
             price=price,
             account=self.current_pp.alloc.account,
             size=0,
-            symbol=symbol,
-            brokers=[symbol.broker],
+            symbol=mkt.fqme,
+            brokers=[mkt.broker],
             oid='',  # filled in on submit
             exec_mode=trigger_type,  # dark or live
         )
@@ -457,10 +458,10 @@ class OrderMode:
         the EMS, adjust mirrored level line on secondary chart.
 
         '''
-        mktinfo = self.chart.linked.symbol
+        mktinfo: MktPair = self.chart.linked.mkt
         level = round(
             line.value(),
-            ndigits=mktinfo.tick_size_digits,
+            ndigits=mktinfo.size_tick_digits,
         )
         # updated by level change callback set in ``.new_line_from_order()``
         dialog = line.dialog
@@ -497,7 +498,9 @@ class OrderMode:
         # a submission is the start of a new order dialog
         dialog = self.dialogs[uuid]
         dialog.lines = lines
-        dialog.last_status_close()
+        cls: Callable | None = dialog.last_status_close
+        if cls:
+            cls()
 
         for line in lines:
 
@@ -549,7 +552,7 @@ class OrderMode:
         # XXX: seems to fail on certain types of races?
         # assert len(lines) == 2
         if lines:
-            flume: Flume = self.feed.flumes[chart.linked.symbol.fqme]
+            flume: Flume = self.feed.flumes[chart.linked.mkt.fqme]
             _, _, ratio = flume.get_ds_info()
 
             for chart, shm in [
@@ -740,15 +743,15 @@ async def open_order_mode(
         lines = LineEditor(godw=godw)
         arrows = ArrowEditor(godw=godw)
 
-        # symbol id
-        symbol = chart.linked.symbol
+        # market endpoint info
+        mkt: MktPair = chart.linked.mkt
 
         # map of per-provider account keys to position tracker instances
         trackers: dict[str, PositionTracker] = {}
 
         # load account names from ``brokers.toml``
         accounts_def = config.load_accounts(
-            providers=[symbol.broker],
+            providers=[mkt.broker],
         )
 
         # XXX: ``brokerd`` delivers a set of account names that it
@@ -771,17 +774,17 @@ async def open_order_mode(
 
             # net-zero pp
             startup_pp = Position(
-                mkt=symbol,
+                mkt=mkt,
                 size=0,
                 ppu=0,
 
                 # XXX: BLEH, do we care about this on the client side?
-                bs_mktid=symbol.key,
+                bs_mktid=mkt.key,
             )
 
             # allocator config
-            alloc = mk_allocator(
-                symbol=symbol,
+            alloc: Allocator = mk_allocator(
+                mkt=mkt,
                 account=account_name,
 
                 # if this startup size is greater the allocator limit,