diff --git a/chain.js b/chain.js
index 564acc3..04d7b80 100644
--- a/chain.js
+++ b/chain.js
@@ -52,6 +52,7 @@ for (const chain of _chains) {
                     const coinAddr = await mock.COIN()
                     const usdAddr = await mock.USD()
                     chain.mockenv = tx.contractAddress
+                    chain.mockCoins = [coinAddr, usdAddr]
                     chain.tokens = [
                         {
                             name: 'Mockcoin',
diff --git a/main.js b/main.js
index dbb0619..2507739 100644
--- a/main.js
+++ b/main.js
@@ -4,6 +4,7 @@ import {lookupToken} from "./token.js";
 import {httpServer, io} from "./io.js";
 import {ensureVault, loginAddress} from "./vault.js";
 import {chainInfo, VAULT_INIT_CODE_HASH} from "./chain.js";
+import {subPools, unsubPools} from "./pool.js";
 
 
 // setup socket.io
@@ -14,8 +15,8 @@ io.on("connection", (socket) => {
         lookupToken(chainId, address).then((result)=>callback(result)).catch(()=>callback(null))
     })
     socket.on('address', (chainId, address) => loginAddress(socket, chainId, address) )
-    socket.on('subPools', (chainId, addresses) => { for(const address of addresses) socket.join(`${chainId}|${address}`) } )
-    socket.on('unsubPools', (chainId, addresses) => { for(const address of addresses) socket.leave(`${chainId}|${address}`) } )
+    socket.on('subPools', (chainId, addresses) => subPools(socket, chainId, addresses) )
+    socket.on('unsubPools', (chainId, addresses) => unsubPools(socket, chainId, addresses) )
     socket.on('ensureVault', (chainId,owner,num) => ensureVault(socket, chainId, owner, num) )
     socket.join('public')
     socket.emit('welcome', {chainInfo, vaultInitCodeHash:VAULT_INIT_CODE_HASH})
diff --git a/pool.js b/pool.js
new file mode 100644
index 0000000..abf5590
--- /dev/null
+++ b/pool.js
@@ -0,0 +1,16 @@
+
+export function subPools( socket, chainId, addresses) {
+    for(const address of addresses) {
+        const room = `${chainId}|${address}`;
+        socket.join(room)
+        console.log('joined room', room)
+    }
+}
+
+export function unsubPools( socket, chainId, addresses ) {
+    for(const address of addresses) {
+        const room = `${chainId}|${address}`;
+        socket.leave(room)
+        console.log('left room', room)
+    }
+}