diff --git a/README.md b/README.md
index 1d3a826..2edaedb 100644
--- a/README.md
+++ b/README.md
@@ -86,7 +86,7 @@ var config = {
   data: ["0x6d02", "hello from datapay"],
   pay: {
     key: "5JZ4RXH4MoXpaUQMcJHo8DxhZtkf5U5VnYd9zZH8BRKZuAbxZEw",
-    rpc: "https://api.bitindex.network",
+    rpc: "https://api.mattercloud.net",
     fee: 400,
     to: [{
       address: "1A2JN4JAUoKCQ5kA4pHhu4qCqma8jZSU81",
@@ -101,7 +101,7 @@ Above config describes a transaction that:
 - Posts `"hello from datapay"` to [memo.cash](https://memo.cash) network (See the protocol at [https://memo.cash/protocol](https://memo.cash/protocol)),
 - paying the fee of `400` satoshis,
 - signed with a private key: `5JZ4RXH4MoXpaUQMcJHo8DxhZtkf5U5VnYd9zZH8BRKZuAbxZEw`,
-- through a public JSON-RPC endpoint at [https://api.bitindex.network](https://api.bitindex.network)
+- through a public JSON-RPC endpoint at [https://api.mattercloud.net](https://api.mattercloud.net)
 - while tipping the user `1A2JN4JAUoKCQ5kA4pHhu4qCqma8jZSU81` a value of `1000` satoshis.
 
 All you need to do to invoke it is call:
@@ -301,7 +301,7 @@ datapay.build(tx, function(err, tx) {
 
 The `rpc` attribute is used to manually set the JSON-RPC endpoint you wish to broadcast through. 
 
-- default: `https://api.bitindex.network`
+- default: `https://api.mattercloud.net`
 
 ```
 const tx = {
@@ -309,7 +309,7 @@ const tx = {
   data: ["0x6d02", "hello world"],
   pay: {
     key: "5JZ4RXH4MoXpaUQMcJHo8DxhZtkf5U5VnYd9zZH8BRKZuAbxZEw",
-    rpc: "https://api.bitindex.network"
+    rpc: "https://api.mattercloud.net"
   }
 };
 datapay.build(tx, function(err, res) {
@@ -332,7 +332,7 @@ const tx = {
   data: ["0x6d02", "hello world"],
   pay: {
     key: "5JZ4RXH4MoXpaUQMcJHo8DxhZtkf5U5VnYd9zZH8BRKZuAbxZEw",
-    rpc: "https://api.bitindex.network",
+    rpc: "https://api.mattercloud.net",
     fee: 400
   }
 }
@@ -356,7 +356,7 @@ const tx = {
   data: ["0x6d02", "hello world"],
   pay: {
     key: "5JZ4RXH4MoXpaUQMcJHo8DxhZtkf5U5VnYd9zZH8BRKZuAbxZEw",
-    rpc: "https://api.bitindex.network",
+    rpc: "https://api.mattercloud.net",
     feeb: 1.04
   }
 }
@@ -589,7 +589,7 @@ Using this endpoint you can connect to a public JSON-RPC endpoint to let you mak
 datapay.connect([RPC ENDPOINT]).[METHOD]
 ```
 
-If you leave the `RPC ENDPOINT` part out, it will automatically use the default https://api.bitindex.network node
+If you leave the `RPC ENDPOINT` part out, it will automatically use the default https://api.mattercloud.net node
 
 ### Example 1: Connecting to default node and calling `getUnspentUtxos()` method:
 
@@ -606,7 +606,7 @@ datapay.connect().getUnspentUtxos("14xMz8rKm4L83RuZdmsHXD2jvENZbv72vR", function
 ### Example 2. Specifying a JSON-RPC endpoint
 
 ```
-datapay.connect('https://api.bitindex.network').getUnspentUtxos("14xMz8rKm4L83RuZdmsHXD2jvENZbv72vR", function(err, utxos) {
+datapay.connect('https://api.mattercloud.net').getUnspentUtxos("14xMz8rKm4L83RuZdmsHXD2jvENZbv72vR", function(err, utxos) {
   if (err) {
     console.log("Error: ", err)
   } else {
diff --git a/example/composer.html b/example/composer.html
index fcb5d41..0525f46 100644
--- a/example/composer.html
+++ b/example/composer.html
@@ -77,7 +77,10 @@
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <script src="https://unpkg.com/datapay@0.0.17/dist/datapay.min.js"></script>
 <script>
-var endpoint = "https://api.bitindex.network/api/tx/send";
+var endpoint = "https://api.mattercloud.net/api/v3/main/tx/send"; // alternative: 'https://api.whatsonchain.com/v1/bsv/main/tx/raw'
+var rawTxKey = 'rawtx'; // use 'txhex' for api.whatsonchain.com
+var apiKey = ''; // only needed for api.mattercloud.net when exeeding 3 tx per 15 seconds.
+                 // Get the API key from https://www.mattercloud.net/#get-api-key
 document.addEventListener("DOMContentLoaded", function(event) {
   var dslEl = document.querySelector("#dsl");
   var txEl = document.querySelector("#tx");
@@ -109,20 +112,25 @@
   update(dslEl.value)
 })
 var send = function(transaction) {
+  header = {
+    'Accept': 'application/json',
+    'Content-Type': 'application/json'
+  };
+
+  if (apiKey.length > 0)
+    header.apikey = apiKey;
+  
   fetch(endpoint, {
-    headers: {
-      'Accept': 'application/json',
-      'Content-Type': 'application/json'
-    },
+    headers: header,
     method: 'POST',
-    body: JSON.stringify({rawtx: transaction})
+    body: `{"${rawTxKey}": "${transaction.toString()}"}`
   })
   .then(function(res) {
     return res.json();
   })
   .then(function(response) {
     console.log(response);
-    document.querySelector("#sent").innerHTML = "<a href='https://api.bitindex.network/api/v2/tx/" + response.txid + "' target='_blank'>Success! Click to view Transaction</a>";
+    document.querySelector("#sent").innerHTML = "<a href='https://whatsonchain.com/tx/" + response.txid + "' target='_blank'>Success! Click to view Transaction</a>";
     document.querySelector("#sent").className = "";
     document.querySelector("#send").className = "hidden";
   })
diff --git a/example/playground.html b/example/playground.html
index 61f9a12..8b35648 100644
--- a/example/playground.html
+++ b/example/playground.html
@@ -77,7 +77,10 @@
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <script src="https://unpkg.com/datapay@0.0.17/dist/datapay.min.js"></script>
 <script>
-var endpoint = "https://api.bitindex.network/api/tx/send";
+var endpoint = "https://api.mattercloud.net/api/v3/main/tx/send"; // alternative: 'https://api.whatsonchain.com/v1/bsv/main/tx/raw'
+var rawTxKey = 'rawtx'; // use 'txhex' for api.whatsonchain.com
+var apiKey = ''; // only needed for api.mattercloud.net when exeeding 3 tx per 15 seconds.
+                 // Get the API key from https://www.mattercloud.net/#get-api-key
 var transaction = null;
 var selected = null;
 var sending = false;
@@ -119,13 +122,18 @@
       } else {
         e.target.textContent = "Sending...";
         sending = true;
+        header = {
+          'Accept': 'application/json',
+          'Content-Type': 'application/json'
+        };
+
+        if (apiKey.length > 0)
+          header.apikey = apiKey;
+
         fetch(endpoint, {
-          headers: {
-            'Accept': 'application/json',
-            'Content-Type': 'application/json'
-          },
+          headers: header,
           method: 'POST',
-          body: JSON.stringify({rawtx: transaction.toString()})
+          body: `{"${rawTxKey}": "${transaction.toString()}"}`
         })
         .then(function(res) {
           return res.json();
@@ -133,7 +141,7 @@
         .then(function(response) {
           console.log("Response = ", response)
           e.target.textContent = "Sent!";
-          confirmEl.innerHTML = "<a href='https://api.bitindex.network/api/v2/tx/" + response.txid + "' target='_blank'>Success! Click to view Transaction</a>";
+          confirmEl.innerHTML = "<a href='https://whatsonchain.com/tx/" + response.txid + "' target='_blank'>Success! Click to view Transaction</a>";
         })
       }
     }
diff --git a/index.js b/index.js
index 8e76ec5..f88b0fb 100644
--- a/index.js
+++ b/index.js
@@ -3,7 +3,7 @@ const _Buffer = require('buffer/')
 const bitcoin = require('bsv');
 const explorer = require('bitcore-explorers');
 const defaults = {
-  rpc: "https://api.bitindex.network",
+  rpc: "api.mattercloud.net",
   fee: 400,
   feeb: 1.4
 }
diff --git a/test/test.js b/test/test.js
index f1f9460..054ced9 100644
--- a/test/test.js
+++ b/test/test.js
@@ -595,12 +595,12 @@ describe('datapay', function() {
       it('default', function() {
         var insight = datapay.connect();
         assert.equal(insight.constructor.name, "Insight")
-        assert.equal(insight.url, 'https://api.bitindex.network')
+        assert.equal(insight.url, 'https://api.mattercloud.net')
       })
       it('connect with url', function() {
-        var insight = datapay.connect('https://api.bitindex.network');
+        var insight = datapay.connect('https://api.mattercloud.net');
         assert.equal(insight.constructor.name, "Insight")
-        assert.equal(insight.url, 'https://api.bitindex.network')
+        assert.equal(insight.url, 'https://api.mattercloud.net')
       })
     })
   })