diff --git a/db.js b/db.js
index ab87ef8c8..ccf551492 100644
--- a/db.js
+++ b/db.js
@@ -74,6 +74,12 @@ var BlockStat = new Schema(
     "uncleCount": Number
 });
 
+var TxStat = new Schema(
+{
+    "timestamp": {type: Number, index: {unique: true}},
+    "txns": Number
+}, {collection: "TxStat"});
+
 // create indices
 Transaction.index({timestamp:-1});
 Transaction.index({blockNumber:-1});
@@ -86,11 +92,13 @@ Block.index({miner:1});
 Block.index({miner:1, blockNumber:-1});
 
 mongoose.model('BlockStat', BlockStat);
+mongoose.model('TxStat', TxStat);
 mongoose.model('Block', Block);
 mongoose.model('Account', Account);
 mongoose.model('Contract', Contract);
 mongoose.model('Transaction', Transaction);
 module.exports.BlockStat = mongoose.model('BlockStat');
+module.exports.TxStat = mongoose.model('TxStat');
 module.exports.Block = mongoose.model('Block');
 module.exports.Contract = mongoose.model('Contract');
 module.exports.Transaction = mongoose.model('Transaction');
diff --git a/routes/stats.js b/routes/stats.js
index 31e71469e..db44a16c0 100644
--- a/routes/stats.js
+++ b/routes/stats.js
@@ -1,6 +1,7 @@
 var mongoose = require( 'mongoose' );
 var Block     = mongoose.model( 'Block' );
 var BlockStat = mongoose.model( 'BlockStat' );
+var TxStat    = mongoose.model( 'TxStat' );
 var Transaction = mongoose.model( 'Transaction' );
 var filters = require('./filters');
 
@@ -104,58 +105,20 @@ var getTxStats = function(req, res) {
     }
   }
 
-  // select mod
-  var rngs = [    60*60,    2*60*60,     4*60*60,     6*60*60,    12*60*60,
-               24*60*60, 7*24*60*60, 14*24*60*60, 30*24*60*60, 60*24*60*60
-             ];
-  var mods = [    30*60,      30*60,       60*60,       60*60,       60*60,
-                  60*60,   24*60*60,    24*60*60,    24*60*60,    24*60*60,
-               24*60*60
-             ];
-  var i = 0;
-  rngs.forEach(function(r) {
-    if (range > r) {
-      i++;
-    }
-    return;
-  });
-  var mod = mods[i];
-
   var timebefore = parseInt((new Date()).getTime() / 1000) - range;
-  timebefore -= timebefore % mod;
-  Transaction.aggregate([{
-    $match: {
-      timestamp: {
-        $gte: timebefore
+
+  TxStat.find({ timestamp: { $gte: timebefore } }, "timestamp txns")
+    .lean(true).sort('-timestamp').limit(100)
+    .exec(function (err, docs) {
+      if (err || !docs) {
+        console.error(err);
+        res.status(500).send();
+        res.end();
+        return;
       }
-    }
-  }, {
-    $group: {
-      _id: {
-        timestamp: {
-          $subtract: [ '$timestamp', { $mod: [ '$timestamp', mod ] } ]
-        }
-      },
-      timestamp: { $min: '$timestamp' },
-      txns: { $sum: 1 },
-      amount: { $sum: '$value' }
-    }
-  }, {
-    $project: {
-      "_id": 0,
-      "timestamp": 1,
-      "txns": 1,
-      "amount": 1
-    }
-  }]).sort('timestamp').exec(function(err, result) {
-    if (err || !result) {
-      console.error(err);
-      res.status(500).send();
-    } else {
-      res.write(JSON.stringify(result));
+      res.write(JSON.stringify(docs));
       res.end();
-    }
-  });
+    });
 }
 
 /**
diff --git a/tools/stats.js b/tools/stats.js
index 2c912ed25..c3783841d 100644
--- a/tools/stats.js
+++ b/tools/stats.js
@@ -7,6 +7,8 @@ var Web3 = require('web3');
 
 var mongoose = require( 'mongoose' );
 var BlockStat = require( '../db.js' ).BlockStat;
+var TxStat = require( '../db.js' ).TxStat;
+var Transaction = require( '../db.js' ).Transaction;
 
 var updateStats = function(range, interval, rescan) {
     var latestBlock = web3.eth.blockNumber;
@@ -58,6 +60,79 @@ var getStats = function(web3, blockNumber, nextBlock, endNumber, interval, resca
     }
 }
 
+/**
+ * Aggregate transaction stats
+ */
+var updateTxStats = function(settings, range) {
+    var days = settings.stats && settings.stats.txnDays || 3;
+
+    var defaultRange =  24*days*60*60;
+    // check validity of range
+    if (range && range < 60 * 60 * 24 * 7) {
+        if (range < 3600) { // minimal 1 hour
+            range = 3600;
+        }
+    } else {
+        range = defaultRange;
+    }
+
+    // select mod
+    var rngs = [    60*60,    2*60*60,     4*60*60,     6*60*60,    12*60*60,
+                 24*60*60, 7*24*60*60, 14*24*60*60, 30*24*60*60, 60*24*60*60
+               ];
+    var mods = [    30*60,      30*60,       60*60,       60*60,       60*60,
+                    60*60,   24*60*60,    24*60*60,    24*60*60,    24*60*60,
+                 24*60*60
+               ];
+    var i = 0;
+    rngs.forEach(function(r) {
+        if (range > r) {
+            i++;
+        }
+        return;
+    });
+    var mod = mods[i];
+
+    var timebefore = parseInt((new Date()).getTime() / 1000) - range;
+    timebefore -= timebefore % mod;
+    Transaction.aggregate([{
+        $match: {
+            timestamp: {
+                $gte: timebefore
+            }
+        }
+    }, {
+        $group: {
+            _id: {
+                timestamp: {
+                    $subtract: [ '$timestamp', { $mod: [ '$timestamp', mod ] } ]
+                }
+            },
+            timestamp: { $min: '$timestamp' },
+            txns: { $sum: 1 }
+        }
+    }, {
+        $project: {
+            "_id": 0,
+            "timestamp": 1,
+            "txns": 1
+        }
+    }]).sort('timestamp').exec(function(err, results) {
+        if (err || !results) {
+            console.error(err);
+        } else {
+            results.forEach(function(result) {
+                var txstat = {
+                    "timestamp": result.timestamp,
+                    "txns": result.txns
+                }
+                console.log(' - txstat ' + result.timestamp + ' / txns = ' + result.txns);
+                TxStat.collection.update({ timestamp: result.timestamp }, { $set: txstat }, { upsert: true });
+            });
+        }
+    });
+}
+
 /**
   * Checks if the a record exists for the block number 
   *     if record exists: abort
@@ -117,6 +192,11 @@ var rescan = false; /* rescan: true - rescan range */
 var range = 1000;
 var interval = 100;
 
+// tx stats
+var notxstats = false;
+// interval
+var txStatInterval = 10 * 60 * 1000;
+
 /**
  * RESCAN=1000:100000 means interval;range
  *
@@ -142,6 +222,15 @@ if (process.env.RESCAN) {
     rescan = true;
 }
 
+/**
+ * Usage:
+ *  - one time execute updateTxStats()
+ *   NOTXSTATS=1 tools/stats.js
+ */
+if (process.env.NOTXSTATS) {
+    notxstats = true;
+}
+
 // load config.json
 var config = { nodeAddr: 'localhost', gethPort: 8545, bulkSize: 100 };
 try {
@@ -171,3 +260,12 @@ if (!rescan) {
       updateStats(range, interval);
     }, statInterval);
 }
+
+// update TxStats
+updateTxStats(config.settings, 24*14*60*60); /* scan 14 days */
+
+if (!notxstats) {
+    setInterval(function() {
+        updateTxStats(config.settings, 24*60*60); /* update */
+    }, txStatInterval);
+}