diff --git a/package.json b/package.json
index 0add3d573..a8a20809b 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "nOS",
   "description": "nOS: NEO Operating System",
   "author": "nOS",
-  "version": "0.4.2",
+  "version": "0.4.3",
   "private": true,
   "main": "dist/main/main.js",
   "license": "MIT",
diff --git a/src/common/util/getRPCEndpoint.js b/src/common/util/getRPCEndpoint.js
new file mode 100644
index 000000000..87d34820a
--- /dev/null
+++ b/src/common/util/getRPCEndpoint.js
@@ -0,0 +1,73 @@
+import fetch from 'node-fetch';
+import { rpc, settings } from '@cityofzion/neon-js';
+
+let cachedRPC = null;
+
+function getAPIEndpoint(net) {
+  if (settings.networks[net]) {
+    return settings.networks[net].extra.neoscan;
+  }
+
+  return net;
+}
+
+function isUnreliableNode(url) {
+  return url.match(/redpulse\.com/i) ||
+    url.match(/ddns\.net/i) ||
+    url.match(/neeeo\.org/i) ||
+    url.match(/otcgo\.cn/i) ||
+    url.match(/seed1\.aphelion-neo\.com/i);
+}
+
+function raceToSuccess(promises) {
+  return Promise.all(
+    promises.map((p) => (
+      // If a request fails, count that as a resolution so it will keep
+      // waiting for other possible successes. If a request succeeds,
+      // treat it as a rejection so Promise.all immediately bails out.
+      p.then((val) => Promise.reject(val), (err) => err)
+    ))
+  ).then(
+    // If '.all' resolved, we've just got an array of errors.
+    (errors) => Promise.reject(errors),
+    // If '.all' rejected, we've got the result we wanted.
+    (val) => val
+  );
+}
+
+export default async function getRPCEndpoint(net) {
+  const apiEndpoint = getAPIEndpoint(net);
+  const response = await fetch(`${apiEndpoint}/v1/get_all_nodes`);
+  const data = await response.json();
+  let nodes = data.sort((a, b) => b.height - a.height);
+
+  if (settings.httpsOnly) {
+    nodes = nodes.filter((n) => n.url.includes('https://'));
+  }
+
+  if (nodes.length === 0) {
+    throw new Error('No eligible nodes found!');
+  }
+
+  const heightThreshold = nodes[0].height - 1;
+  const goodNodes = nodes.filter((n) => n.height >= heightThreshold);
+  const urls = goodNodes.map((n) => n.url).filter((url) => !isUnreliableNode(url));
+
+  if (urls.length === 0) {
+    throw new Error('No eligible nodes found!');
+  }
+
+  if (urls.includes(cachedRPC)) {
+    return new rpc.RPCClient(cachedRPC).ping().then((num) => {
+      if (num <= settings.timeout.ping) return cachedRPC;
+      cachedRPC = null;
+      return getRPCEndpoint(net);
+    });
+  }
+
+  const clients = urls.map((u) => new rpc.RPCClient(u));
+
+  const fastestUrl = await raceToSuccess(clients.map((c) => c.ping().then(() => c.net)));
+  cachedRPC = fastestUrl;
+  return fastestUrl;
+}
diff --git a/src/main/util/resolve.js b/src/main/util/resolve.js
index 51b058b53..c6b1b2d74 100644
--- a/src/main/util/resolve.js
+++ b/src/main/util/resolve.js
@@ -1,9 +1,10 @@
 import isDev from 'electron-is-dev';
 import path from 'path';
 import { resolve as resolveURL, format as formatURL } from 'url';
-import { api, rpc, u } from '@cityofzion/neon-js';
+import { rpc, u } from '@cityofzion/neon-js';
 
 import updateNetworks from 'util/updateNetworks';
+import getRPCEndpoint from 'util/getRPCEndpoint';
 
 // TODO: Configurable network
 import { NOS_TESTNET } from 'values/networks';
@@ -46,7 +47,7 @@ function resolveLocal(url) {
 async function resolveNameService(url) {
   const { host, pathname } = url;
 
-  const endpoint = await api.getRPCEndpointFrom({ net: NOS_TESTNET }, api.neoscan);
+  const endpoint = await getRPCEndpoint(NOS_TESTNET);
   const client = new rpc.RPCClient(endpoint);
   const storageKey = u.str2hexstring(`${host}.target`);
   const response = await client.getStorage(NS_SCRIPT_HASH, storageKey);
diff --git a/src/renderer/browser/actions/makeTestInvokeActions.js b/src/renderer/browser/actions/makeTestInvokeActions.js
index 8503d5106..a1aa8388f 100644
--- a/src/renderer/browser/actions/makeTestInvokeActions.js
+++ b/src/renderer/browser/actions/makeTestInvokeActions.js
@@ -1,7 +1,9 @@
 import { createActions } from 'spunky';
-import { api, rpc, wallet } from '@cityofzion/neon-js';
+import { rpc, wallet } from '@cityofzion/neon-js';
 import { isArray } from 'lodash';
 
+import getRPCEndpoint from 'util/getRPCEndpoint';
+
 import createScript from 'shared/util/createScript';
 
 import generateDAppActionId from './generateDAppActionId';
@@ -21,7 +23,7 @@ const testInvoke = async ({ net, scriptHash, operation, args, encodeArgs }) => {
     throw new Error(`Invalid arguments: "${args}"`);
   }
 
-  const endpoint = await api.getRPCEndpointFrom({ net }, api.neoscan);
+  const endpoint = await getRPCEndpoint(net);
   const script = createScript(scriptHash, operation, args, encodeArgs);
   const { result } = await rpc.Query.invokeScript(script).execute(endpoint);
 
diff --git a/src/renderer/shared/actions/blockActions.js b/src/renderer/shared/actions/blockActions.js
index 3ee06d221..d844109ec 100644
--- a/src/renderer/shared/actions/blockActions.js
+++ b/src/renderer/shared/actions/blockActions.js
@@ -1,10 +1,12 @@
-import { api, rpc } from '@cityofzion/neon-js';
+import { rpc } from '@cityofzion/neon-js';
 import { createActions } from 'spunky';
 
+import getRPCEndpoint from 'util/getRPCEndpoint';
+
 export const ID = 'block';
 
 export default createActions(ID, ({ net }) => async () => {
-  const endpoint = await api.getRPCEndpointFrom({ net }, api.neoscan);
+  const endpoint = await getRPCEndpoint(net);
   const client = new rpc.RPCClient(endpoint);
   const height = await client.getBlockCount();
   return client.getBlock(height - 1);
diff --git a/src/renderer/shared/util/getBalances.js b/src/renderer/shared/util/getBalances.js
index 1ea78fc09..60cc70ce6 100644
--- a/src/renderer/shared/util/getBalances.js
+++ b/src/renderer/shared/util/getBalances.js
@@ -1,6 +1,8 @@
 import { extend, get, find } from 'lodash';
 import { api, rpc, wallet } from '@cityofzion/neon-js';
 
+import getRPCEndpoint from 'util/getRPCEndpoint';
+
 import getTokens from './getTokens';
 import { GAS, NEO, ASSETS } from '../values/assets';
 
@@ -32,7 +34,7 @@ async function getAssetBalances(endpoint, address) {
 }
 
 export default async function getBalances({ net, address }) {
-  const endpoint = await api.getRPCEndpointFrom({ net }, api.neoscan);
+  const endpoint = await getRPCEndpoint(net);
 
   if (!wallet.isAddress(address)) {
     throw new Error(`Invalid address: "${address}"`);
diff --git a/src/renderer/shared/util/getStorage.js b/src/renderer/shared/util/getStorage.js
index cbf532085..71271a423 100644
--- a/src/renderer/shared/util/getStorage.js
+++ b/src/renderer/shared/util/getStorage.js
@@ -1,4 +1,6 @@
-import { wallet, api, rpc, u } from '@cityofzion/neon-js';
+import { wallet, rpc, u } from '@cityofzion/neon-js';
+
+import getRPCEndpoint from 'util/getRPCEndpoint';
 
 export const encode = (value) => u.str2hexstring(value);
 export const decode = (value) => u.hexstring2str(value);
@@ -12,7 +14,7 @@ export default async function getStorage({ net, scriptHash, key, encodeInput, de
     throw new Error(`Invalid key: "${key}"`);
   }
 
-  const endpoint = await api.getRPCEndpointFrom({ net }, api.neoscan);
+  const endpoint = await getRPCEndpoint(net);
   const input = encodeInput ? encode(key) : key;
   const { result } = await rpc.Query.getStorage(scriptHash, input).execute(endpoint);