diff --git a/lib/ticker.js b/lib/ticker.js
index 3e9e6d3e..a61cbcb5 100644
--- a/lib/ticker.js
+++ b/lib/ticker.js
@@ -6,7 +6,8 @@ const logger = require('./logger')
 const lastRate = {}
 
 const FETCH_INTERVAL = 10000
-function getRates (settings, fiatCode, cryptoCode) {
+
+function _getRates (settings, fiatCode, cryptoCode) {
   return Promise.resolve()
   .then(() => {
     const config = settings.config
@@ -33,6 +34,9 @@ function getRates (settings, fiatCode, cryptoCode) {
   })
 }
 
-module.exports = {
-  getRates: mem(getRates, {maxAge: FETCH_INTERVAL})
-}
+const getRates = mem(_getRates, {
+  maxAge: FETCH_INTERVAL,
+  cacheKey: (settings, fiatCode, cryptoCode) => JSON.stringify([fiatCode, cryptoCode])
+})
+
+module.exports = {getRates}
diff --git a/lib/wallet.js b/lib/wallet.js
index 8c1c9faa..c9975d33 100644
--- a/lib/wallet.js
+++ b/lib/wallet.js
@@ -40,7 +40,7 @@ function fetchWallet (settings, cryptoCode) {
 
 const lastBalance = {}
 
-function balance (settings, cryptoCode) {
+function _balance (settings, cryptoCode) {
   return fetchWallet(settings, cryptoCode)
   .then(r => r.wallet.balance(r.account, cryptoCode))
   .then(balance => ({balance, timestamp: Date.now()}))
@@ -151,8 +151,13 @@ function cryptoNetwork (settings, cryptoCode) {
   return wallet.cryptoNetwork(account, cryptoCode)
 }
 
+const balance = mem(_balance, {
+  maxAge: FETCH_INTERVAL,
+  cacheKey: (settings, cryptoCode) => cryptoCode
+})
+
 module.exports = {
-  balance: mem(balance, {maxAge: FETCH_INTERVAL}),
+  balance,
   sendCoins,
   newAddress,
   getStatus,