diff --git a/pkg/arvo/app/pool-group-hook.hoon b/pkg/arvo/app/pool-group-hook.hoon
new file mode 100644
index 0000000000..6c919ae337
--- /dev/null
+++ b/pkg/arvo/app/pool-group-hook.hoon
@@ -0,0 +1,199 @@
+::  pool-group-hook: maintain groups based on invite pool
+::
+::    looks at our invite tree, adds our siblings to group at +group-path
+::
+/-  group-store, spider
+/+  default-agent, verb
+=,  ethereum-types
+=,  able:jael
+::
+=>  |%
+    ++  group-path    /invite-peers
+    ++  refresh-rate  ~m15
+    --
+::
+=>  |%
+    +$  app-state
+      $:  %0
+          running=(unit =tid:spider)
+          url=_'http://eth-mainnet.urbit.org:8545'
+          inviter=(unit ship)
+          invited=(set ship)
+      ==
+    ::
+    +$  card  card:agent:gall
+    --
+::
+::  Main
+::
+=|  state=app-state
+::
+%+  verb  |
+^-  agent:gall
+=<
+  |_  =bowl:gall
+  +*  this  .
+      do    ~(. +> bowl)
+      def   ~(. (default-agent this %|) bowl)
+  ::
+  ++  on-init
+    ^-  (quip card _this)
+    =^  cards  state
+      poll-inviter:do
+    [cards this]
+  ::
+  ++  on-save   !>(state)
+  ++  on-load
+    |=  old=vase
+    ^-  (quip card _this)
+    [~ this(state !<(app-state old))]
+  ::
+  ++  on-agent
+    |=  [=wire =sign:agent:gall]
+    ^-  (quip card agent:gall)
+    ?.  ?=([%running *] wire)
+      (on-agent:def wire sign)
+    ?-  -.sign
+        %poke-ack
+      ?~  p.sign
+        [~ this]
+      %-  (slog leaf+"{(trip dap.bowl)} couldn't start thread" u.p.sign)
+      :_  this(running.state ~)
+      ~[(leave-spider:do t.wire) set-timer:do]
+    ::
+        %watch-ack
+      ?~  p.sign
+        [~ this]
+      =/  =tank  leaf+"{(trip dap.bowl)} couldn't start listen to thread"
+      %-  (slog tank u.p.sign)
+      [[set-timer:do]~ this(running.state ~)]
+    ::
+        %kick  [~ this(running.state ~)]
+        %fact
+      ?+  p.cage.sign  (on-agent:def wire sign)
+          %thread-fail
+        =+  !<([=term =tang] q.cage.sign)
+        %-  (slog leaf+"{(trip dap.bowl)} failed; will retry" leaf+<term> tang)
+        [[set-timer:do]~ this(running.state ~)]
+      ::
+          %thread-done
+        ?+  t.wire  ~|([dap.bowl %unexpected-thread-done wire] !!)
+            [%inviter ~]
+          =+  !<(res=@t q.cage.sign)
+          =/  inviter=ship
+            `@`(decode-results:abi:ethereum res [%uint]~)
+          ::  if we weren't invited by anyone, don't do anything anymore.
+          ::
+          ?:  =(0 inviter)  [~ this(state state(running ~, inviter ~))]
+          =.  inviter.state  `inviter
+          =^  cards  state
+            poll-invited:do
+          [cards this]
+        ::
+            [%invited ~]
+          =+  !<(res=@t q.cage.sign)
+          =/  invited=(list ship)
+            ;;  (list ship)
+            (decode-results:abi:ethereum res [%array %uint]~)
+          =^  cards  state
+            (process-invited:do invited)
+          [cards this(running.state ~)]
+        ==
+      ==
+    ==
+  ::
+  ++  on-arvo
+    |=  [=wire =sign-arvo]
+    ^-  (quip card _this)
+    ?+  +<.sign-arvo  ~|([dap.bowl %strange-arvo-sign +<.sign-arvo] !!)
+        %wake
+      =^  cards  state
+        ?~  inviter.state
+          poll-inviter:do
+        poll-invited:do
+      [cards this]
+    ==
+  ::
+  ++  on-poke   on-poke:def
+  ++  on-peek   on-peek:def
+  ++  on-watch  on-watch:def
+  ++  on-leave  on-leave:def
+  ++  on-fail   on-fail:def
+  --
+::
+|_  =bowl:gall
+++  five   5
+++  poke-spider
+  |=  [=path =cage]
+  ^-  card
+  [%pass [%running path] %agent [our.bowl %spider] %poke cage]
+::
+++  watch-spider
+  |=  [=path =sub=path]
+  ^-  card
+  [%pass [%running path] %agent [our.bowl %spider] %watch sub-path]
+::
+++  leave-spider
+  |=  [=path]
+  ^-  card
+  [%pass [%running path] %agent [our.bowl %spider] %leave ~]
+::
+++  new-tid
+  |=  eny=@uv
+  ^-  @t
+  :((cury cat 3) dap.bowl '--' (scot %uv eny))
+::
+++  start-contract-read
+  |=  [=wire req=proto-read-request:rpc:ethereum]
+  ^-  (quip card _state)
+  =/  new-tid  (new-tid eny.bowl)
+  =/  args
+    [~ `new-tid %eth-read-contract !>([url.state req])]
+  :_  state(running `new-tid)
+  :~  (watch-spider wire /thread-result/[new-tid])
+      (poke-spider wire %spider-start !>(args))
+  ==
+::
+++  poll-inviter
+  ^-  (quip card _state)
+  %+  start-contract-read  /inviter
+  :+  `'invitedBy'
+    delegated-sending:contracts:azimuth
+  :-  'invitedBy(uint32)'
+  :~  [%uint our.bowl]
+  ==
+::
+++  poll-invited
+  ^-  (quip card _state)
+  ?~  inviter.state
+    ~&  [dap.bowl %skipping-poll-invited]
+    [~ state]
+  %+  start-contract-read  /invited
+  :+  `'getInvited'
+    delegated-sending:contracts:azimuth
+  :-  'getInvited(uint32)'
+  :~  [%uint `@`u.inviter.state]
+  ==
+::
+++  process-invited
+  |=  invited=(list ship)
+  =/  new=(list ship)
+    %+  skip  invited
+    ~(has in invited.state)
+  :_  state(invited (~(gas in invited.state) new))
+  :~  set-timer
+    ::
+      :*  %pass
+          /write
+          %agent
+          [our.bowl %group-store]
+          %poke
+          %group-action
+          !>([%add (sy new) group-path])
+      ==
+  ==
+::
+++  set-timer
+  ^-  card
+  [%pass /timer %arvo %b %wait (add now.bowl refresh-rate)]
+--
diff --git a/pkg/arvo/ted/eth/read-contract.hoon b/pkg/arvo/ted/eth/read-contract.hoon
new file mode 100644
index 0000000000..0658461a77
--- /dev/null
+++ b/pkg/arvo/ted/eth/read-contract.hoon
@@ -0,0 +1,15 @@
+::  eth/read-contract: query ethereum for contract data
+::
+::    produces hex string result, for use with +decode-results:rpc:ethereum
+::
+/+  ethio, strandio
+=,  ethereum-types
+=,  able:jael
+::
+|=  args=vase
+=/  m  (strand:strandio ,vase)
+^-  form:m
+;<  res=@t  bind:m
+  %-  read-contract:ethio
+  !<([@t proto-read-request:rpc:ethereum] args)
+(pure:m !>(res))