diff --git a/nullptr/analyzer.py b/nullptr/analyzer.py
index ed173e1..5941372 100644
--- a/nullptr/analyzer.py
+++ b/nullptr/analyzer.py
@@ -161,7 +161,8 @@ class Analyzer:
           'wp': m.waypoint,
           'buy': p.buy,
           'sell': p.sell,
-          'volume': p.volume
+          'volume': p.volume,
+          'category': m.rtype(r)
         })
     return prices
   
@@ -203,3 +204,14 @@ class Analyzer:
         best_margin = margin
         best_resource = r
     return best_resource
+  
+  def best_sell_market(self, system, r):
+    best_price = 0
+    best_market = None
+    for m in self.store.all_members(system, Marketplace):
+      if r not in m.prices: continue
+      price = m.prices[r].sell
+      if price > best_price:
+        best_price = price
+        best_market = m
+    return best_market
diff --git a/nullptr/api.py b/nullptr/api.py
index 6392591..eab7237 100644
--- a/nullptr/api.py
+++ b/nullptr/api.py
@@ -213,6 +213,10 @@ class Api:
   def siphon(self, ship):
     data = self.request('post', f'my/ships/{ship}/siphon')
     ship.update(data)
+    amt = mg(data, 'siphon.yield.units')
+    rec = mg(data, 'siphon.yield.symbol')
+    ship.log(f"siphoned {amt} {rec}")
+    ship.location.extracted += amt
     return data['siphon']
   
   def extract(self, ship, survey=None):
@@ -229,6 +233,10 @@ class Api:
       else:
         raise e
     ship.update(data)
+    amt = mg(data, 'extraction.yield.units')
+    rec = mg(data, 'extraction.yield.symbol')
+    ship.log(f"extracted {amt} {rec}")
+    ship.location.extracted += amt
     return data
   
   def survey(self, ship):
@@ -239,6 +247,14 @@ class Api:
   
     
   ######## Commerce #########
+  def transaction_cost(self, data):
+    if not 'transaction' in data: return 0
+    act = mg(data,'transaction.type')
+    minus = -1 if act == 'PURCHASE' else 1
+    units = mg(data, 'transaction.units')
+    ppu = mg(data, 'transaction.pricePerUnit')
+    return ppu * units * minus
+    
   def log_transaction(self, data):
     if not 'transaction' in data: return
     typ = mg(data, 'transaction.tradeSymbol')
@@ -294,6 +310,19 @@ class Api:
       self.agent.update(data['agent'])
     return data
   
+  def transfer(self, sship, dship, typ, amt):
+    data = {
+    'tradeSymbol': typ,
+    'units': amt,
+    'shipSymbol': dship.symbol
+    }
+    data = self.request('post', f'my/ships/{sship.symbol}/transfer', data)
+    sship.log(f'transferred {amt} {typ} to {dship}')
+    dship.log(f'received {amt} {typ} from {sship}')
+    if 'cargo' in data:
+      sship.update(data)
+    dship.put_cargo(typ, amt)
+    
   def purchase(self, typ, wp):
     data = {
       'shipType': typ,
diff --git a/nullptr/central_command.py b/nullptr/central_command.py
index 7bf7dee..5503377 100644
--- a/nullptr/central_command.py
+++ b/nullptr/central_command.py
@@ -1,6 +1,7 @@
 from nullptr.store import Store
 from nullptr.models.ship import Ship
 from nullptr.missions import create_mission, get_mission_class
+from nullptr.models.waypoint import Waypoint
 from random import choice, randrange
 from time import sleep
 from threading import Thread
@@ -111,13 +112,35 @@ class CentralCommand:
       if s in self.missions:
         m = self.missions[s]
         
-        
+  def find_gas(self, s):
+    system = s.location.system
+    m = [w for w in self.store.all_members(system, 'Waypoint') if w.type == 'GAS_GIANT']
+    if len(m)==0:
+      raise CentralCommandError('no gas giant found')
+    return m[0]
+  
   def assign_mission(self, s):
     if s.role == 'trader':
       self.assign_trade(s)
     elif s.role == 'probe':
       self.assign_probe(s)
-  
+    elif s.role == 'siphon':
+      self.assign_siphon(s)
+    elif s.role == 'hauler':
+      self.assign_hauler(s)
+      
+  def assign_hauler(self, s):
+    w = self.find_gas(s)
+    m = self.analyzer.best_sell_market(s.location.system, 'HYDROCARBON')
+    self.init_mission(s, 'haul')
+    self.smipa(s, 'site', w)
+    self.smipa(s, 'dest', m)
+    
+  def assign_siphon(self, s):
+    w = self.find_gas(s)
+    self.init_mission(s, 'siphon')
+    self.smipa(s, 'site', w)
+    
   def assign_probe(self, s):   
     system = s.location.system
     m = [m.waypoint for m in self.store.all_members(system, 'Marketplace')]
@@ -165,6 +188,7 @@ class CentralCommand:
     mtype = s.mission
     m = create_mission(mtype, s, self.store, self.api)
     self.missions[s] = m
+    m.status(s.mission_status)
     return m
     
   def stop_mission(self, s):
diff --git a/nullptr/commander.py b/nullptr/commander.py
index 1db43eb..54f4307 100644
--- a/nullptr/commander.py
+++ b/nullptr/commander.py
@@ -118,7 +118,13 @@ class Commander(CommandLine):
       raise CommandError(f'{w} not found')
     return r
     
-      
+  def resolve_ship(self, arg):
+    symbol = f'{self.agent.symbol}-{arg}'
+    ship = self.store.get('Ship', symbol)
+    if ship is None:
+      raise CommandError(f'ship {arg} not found')
+    return ship
+    
   ######## First run #########
   def agent_setup(self):
     symbol = input('agent name: ')
@@ -170,13 +176,9 @@ class Commander(CommandLine):
 
   def do_ship(self, arg=''):
     if arg != '':
-      symbol = f'{self.agent.symbol}-{arg}'
-      ship = self.store.get('Ship', symbol)
-      if ship is None:
-        print('not found')
-        return
-      else:
-        self.ship = ship
+      ship = self.resolve_ship(arg)
+      
+      self.ship = ship
     pprint(self.ship, 5)
 
   ######## Atlas #########
@@ -292,6 +294,17 @@ class Commander(CommandLine):
     self.api.jettison(self.ship, resource.upper())
     self.do_cargo()
   
+  def do_transfer(self, resource, dship, amount=None):
+    if not self.has_ship(): return
+    resource = resource.upper()
+    avail = self.ship.get_cargo(resource)
+    if amount is None: amount = avail
+    amount = int(amount)
+    if avail < amount:
+      raise CommandError('resource not in cargo')
+    dship = self.resolve_ship(dship)
+    self.api.transfer(self.ship, dship, resource, amount)
+    
   
   def do_purchase(self, ship_type):
     if not self.has_ship(): return
@@ -306,7 +319,6 @@ class Commander(CommandLine):
   def do_siphon(self):
     if not self.has_ship(): return
     data = self.api.siphon(self.ship)
-    pprint(data)
   
   def do_survey(self):
     if not self.has_ship(): return
@@ -334,7 +346,7 @@ class Commander(CommandLine):
     pprint(self.ship.mission_state)
   
   def do_role(self, role):
-    roles = [None, 'trader', 'probe']
+    roles = [None, 'trader', 'probe', 'siphon', 'hauler']
     if not self.has_ship(): return 
     if role == 'none':
       role = None
@@ -565,7 +577,7 @@ class Commander(CommandLine):
     for res, p in prices.items():
       print('==' + res)
       for m in p:
-        print(f"{m['wp'].symbol:12s} {m['volume']:5d} {m['buy']:5d} {m['sell']:5d}")
+        print(f"{m['wp'].symbol:12s} {m['category']}  {m['volume']:5d} {m['buy']:5d} {m['sell']:5d}")
   
   def do_path(self, waypoint_str):
     if not self.has_ship(): return
diff --git a/nullptr/missions/__init__.py b/nullptr/missions/__init__.py
index 6d181aa..51b4660 100644
--- a/nullptr/missions/__init__.py
+++ b/nullptr/missions/__init__.py
@@ -4,7 +4,8 @@ from nullptr.missions.trade import TradeMission
 from nullptr.missions.travel import TravelMission
 from nullptr.missions.probe import ProbeMission
 from nullptr.missions.idle import IdleMission
-
+from nullptr.missions.siphon import SiphonMission
+from nullptr.missions.haul import HaulMission
 
 def get_mission_class( mtype):
   types = {
@@ -13,7 +14,10 @@ def get_mission_class( mtype):
     'trade': TradeMission,
     'travel': TravelMission,
     'probe': ProbeMission,
-    'idle': IdleMission
+    'idle': IdleMission,
+    'siphon': SiphonMission,
+    'haul': HaulMission,
+    
   }
   if mtype not in types:
     raise ValueError(f'invalid mission type {mtype}')
diff --git a/nullptr/missions/base.py b/nullptr/missions/base.py
index 60a714c..0d82e74 100644
--- a/nullptr/missions/base.py
+++ b/nullptr/missions/base.py
@@ -51,9 +51,14 @@ class Mission:
     self.ship = ship
     self.store = store
     self.api = api
+    self.wait_for = None
     self.next_step = 0
     self.analyzer = Analyzer(self.store)
+    self.setup()
 
+  def setup(self):
+    pass
+    
   def sts(self, nm, v):
     if issubclass(type(v), Base):
       v = v.symbol
@@ -74,7 +79,17 @@ class Mission:
     if nw is None:
       return self.ship.mission_status
     else:
-      self.ship.mission_status = nw
+      steps = self.steps()
+      if nw in ['init','done', 'error']:
+        self.ship.mission_status = nw 
+        return
+      elif nw not in steps:
+        self.ship.log(f"Invalid mission status {nw}", 1)
+        self.ship.mission_status = 'error'
+        return 
+      wait_for = steps[nw][2] if len(steps[nw]) > 2 else None
+      self.wait_for = wait_for
+      self.ship.mission_status = nw 
       
   def start_state(self):
     return 'done'
@@ -96,10 +111,19 @@ class Mission:
     }
   
   def step_done(self):
-    self.ship.log(f'mission finished', 3)
+    self.ship.log(f'mission finished with balance {self.balance()}', 3)
     
   def is_waiting(self):
-    return self.next_step > time() or self.ship.cooldown > time() or self.ship.arrival > time()
+    if self.next_step > time() or self.ship.cooldown > time() or self.ship.arrival > time():
+      return True
+    if self.wait_for is not None:
+      if self.wait_for():
+        self.wait_for = None
+        return False      
+      else:
+        return True
+    return False
+      
   
   def is_finished(self):
     return self.status() in ['done','error']
@@ -116,7 +140,10 @@ class Mission:
       self.ship.log(f"Invalid mission status {status}", 1)
       self.status('error')
       return
-    handler, next_step = steps[status]
+    
+    handler = steps[status][0]
+    next_step = steps[status][1]
+    
     try:
       result = handler()
     except Exception as e:
@@ -136,6 +163,15 @@ class Mission:
     self.ship.log(f'{status} {result} -> {self.status()}', 8)
 
 class BaseMission(Mission):
+  def balance(self, amt=0):
+    if type(amt) == dict:
+      amt = self.api.transaction_cost(amt)
+    balance = self.st('balance')
+    if balance is None: balance = 0
+    balance += amt
+    self.sts('balance', balance)
+    return balance
+  
   def step_go_dest(self):
     destination = self.rst(Waypoint, 'destination')
     if self.ship.location() == destination:
@@ -179,8 +215,8 @@ class BaseMission(Mission):
     amt_cargo = self.ship.get_cargo(resource)
   
     amount = min(amt_cargo, volume)
-    self.api.sell(self.ship, resource, amount)
-    
+    res = self.api.sell(self.ship, resource, amount)
+    self.balance(res)
     if len(sellables) == 1 and amt_cargo == amount:
       return 'done'
     else:
@@ -228,7 +264,7 @@ class BaseMission(Mission):
     if dest_sys == loc_sys:
       result = self.analyzer.find_nav_path(loc, dest, self.ship.range())
       self.sts('traject', result)
-      return
+      return 'done' if len(result) == 0 else 'more'
     path = self.analyzer.find_path(loc_sys, dest_sys)
     result = []
     if loc.symbol != loc_jg.symbol:
@@ -238,7 +274,7 @@ class BaseMission(Mission):
       result.append(dest)
     self.sts('traject', result)
     print(result)
-    return result
+    return 'more'
     
   def step_dock(self):
     if self.ship.status == 'DOCKED':
@@ -264,7 +300,10 @@ class BaseMission(Mission):
     calc = partial(self.step_calculate_traject, destination)
     steps = {
       
-      f'travel-{nm}': (calc, f'dock-{nm}'),
+      f'travel-{nm}': (calc, {
+      'more': f'dock-{nm}',
+      'done': next_step
+      }),
       f'dock-{nm}': (self.step_dock, f'refuel-{nm}'),
       f'refuel-{nm}': (self.step_refuel, f'orbit-{nm}'),
       f'orbit-{nm}': (self.step_orbit, f'go-{nm}'),
diff --git a/nullptr/missions/haul.py b/nullptr/missions/haul.py
new file mode 100644
index 0000000..995823e
--- /dev/null
+++ b/nullptr/missions/haul.py
@@ -0,0 +1,73 @@
+from nullptr.missions.base import BaseMission, MissionParam
+from nullptr.models.waypoint import Waypoint
+
+class HaulMission(BaseMission):
+  def start_state(self):
+    return 'travel-to'
+  
+  def step_turn(self):
+    self.ship.log('starting haul load')
+  
+  def wait_turn(self):
+    for s in self.store.all('Ship'):
+      if s.mission != 'haul': continue
+      if s.location != self.ship.location:
+        continue
+      if s.mission_state['dest'] != self.st('dest'):
+        continue
+      if s.mission_status != 'load':
+        continue
+      return False
+    return True
+  
+  def wait_cargo(self):
+    dmkt = self.store.get('Marketplace', self.st('dest'))
+    sellables = dmkt.prices.keys()
+    for s in self.store.all("Ship"):
+      if s.location != self.ship.location: continue
+      if s.mission not in ['mine','siphon']: continue
+      for r, a in s.cargo.items():
+        if r not in sellables: continue
+        return True
+    return False
+    
+  def step_load(self):
+    cargo_space = self.ship.cargo_capacity - self.ship.cargo_units
+    dmkt = self.store.get('Marketplace', self.st('dest'))
+    sellables = dmkt.prices.keys()
+    for s in self.store.all("Ship"):
+      if s.location != self.ship.location: continue
+      if s.mission not in ['mine','siphon']: continue
+      for r, a in s.cargo.items():
+        if r not in sellables: continue
+        amount = min(cargo_space, a)
+      
+        res = self.api.transfer(s, self.ship, r, amount)
+      
+        return 'done' if amount == cargo_space else 'more'
+    return 'more'
+  
+  @classmethod
+  def params(cls):
+    return {
+      'site': MissionParam(Waypoint, True),
+      'dest': MissionParam(Waypoint, True),
+    }
+  
+  def steps(self):
+    return {
+      **self.travel_steps('to', 'site', 'wait-turn'),
+       'wait-turn': (self.step_turn, 'load', self.wait_turn),
+      'load': (self.step_load, {
+        'more': 'load',
+        'done': 'travel-back'
+      }, self.wait_cargo),
+      **self.travel_steps('back', 'dest', 'dock-dest'),
+      'dock-dest': (self.step_dock, 'unload'),
+      'unload': (self.step_sell, {
+         'more': 'unload',
+         'done': 'market-dest'
+        }),
+      'market-dest': (self.step_market, 'report'),
+      'report': (self.step_done, 'done')
+    }
diff --git a/nullptr/missions/siphon.py b/nullptr/missions/siphon.py
new file mode 100644
index 0000000..81a45b2
--- /dev/null
+++ b/nullptr/missions/siphon.py
@@ -0,0 +1,25 @@
+from nullptr.missions.base import BaseMission, MissionParam
+from nullptr.models.waypoint import Waypoint
+
+class SiphonMission(BaseMission):
+  def start_state(self):
+    return 'travel-to'
+    
+  @classmethod
+  def params(cls):
+    return {
+      'site': MissionParam(Waypoint, True),
+    }
+    
+  def steps(self):
+    return {
+      **self.travel_steps('to', 'site', 'siphon'),
+      'siphon': (self.step_siphon, 'done', self.cargo_full)
+    }
+  
+  def cargo_full(self):
+    return self.ship.cargo_capacity - self.ship.cargo_units > 5
+  
+  def step_siphon(self):
+    result = self.api.siphon(self.ship)
+    self.next_step = self.ship.cooldown
diff --git a/nullptr/missions/trade.py b/nullptr/missions/trade.py
index a0ba551..9adac1b 100644
--- a/nullptr/missions/trade.py
+++ b/nullptr/missions/trade.py
@@ -20,7 +20,8 @@ class TradeMission(BaseMission):
     amount = min(cargo_space, affordable, volume)
     if amount == 0:
       return 'done'
-    self.api.buy(self.ship, resource, amount)
+    res = self.api.buy(self.ship, resource, amount)
+    self.balance(res)
     return 'done' if amount == cargo_space else 'more'
   
   @classmethod
@@ -46,5 +47,6 @@ class TradeMission(BaseMission):
          'more': 'unload',
          'done': 'market-dest'
         }),
-      'market-dest': (self.step_market, 'done'),
+      'market-dest': (self.step_market, 'report'),
+      'report': (self.step_done, 'done')
     }
diff --git a/nullptr/models/marketplace.py b/nullptr/models/marketplace.py
index 8303334..56bdc93 100644
--- a/nullptr/models/marketplace.py
+++ b/nullptr/models/marketplace.py
@@ -102,5 +102,5 @@ class Marketplace(Base):
       r += '\n'
       for res, p in self.prices.items():
         t = self.rtype(res)
-        r += f'{t} {res:25s} {p.sell:5d} {p.buy:5d}\n'
+        r += f'{t} {res:25s} {p.buy:5d} {p.sell:5d}\n'
     return r
diff --git a/nullptr/models/ship.py b/nullptr/models/ship.py
index c2c604b..33fbf2d 100644
--- a/nullptr/models/ship.py
+++ b/nullptr/models/ship.py
@@ -88,6 +88,14 @@ class Ship(Base):
       self.cargo[typ] -= amt
     
     self.cargo_units = sum(self.cargo.values())
+
+  def put_cargo(self, typ, amt):
+    if typ not in self.cargo:
+      self.cargo[typ] = amt
+    else:
+      self.cargo[typ] += amt
+    
+    self.cargo_units = sum(self.cargo.values())
     
   def load_cargo(self, cargo):
     result = {}
diff --git a/nullptr/models/waypoint.py b/nullptr/models/waypoint.py
index d42bb10..5b3ef0f 100644
--- a/nullptr/models/waypoint.py
+++ b/nullptr/models/waypoint.py
@@ -13,6 +13,7 @@ class Waypoint(Base):
     self.faction:str = ''
     self.is_under_construction:bool = False
     self.uncharted = True
+    self.extracted:int = 0
 
     
   def update(self, d):
diff --git a/nullptr/store.py b/nullptr/store.py
index d2dee16..7d9d49e 100644
--- a/nullptr/store.py
+++ b/nullptr/store.py
@@ -9,6 +9,7 @@ import pickle
 from struct import unpack, pack
 from functools import partial
 from io import BytesIO
+from copy import copy
 
 class StorePickler(pickle.Pickler):
   def persistent_id(self, obj):
@@ -315,7 +316,7 @@ class Store:
     self.cleanup()
     it = 0
     start_time = time()
-    for obj in self.dirty_objects:
+    for obj in copy(self.dirty_objects):
       it += 1
       if obj.is_expired():
         self.purge(obj)