diff --git a/lib/app.js b/lib/app.js
index bc643bd8..d41b2508 100644
--- a/lib/app.js
+++ b/lib/app.js
@@ -8,7 +8,7 @@ var routes = require('./routes');
 var Trader = require('./trader');
 var PostgresqlInterface = require('./postgresql_interface');
 var logger = require('./logger');
- 
+
 module.exports = function (options) {
   var app = express();
   var connectionString;
@@ -47,10 +47,9 @@ module.exports = function (options) {
 
   app.use(express.bodyParser());
 
-  if (!options.https) {
-    server = http.createServer(app);
-  }
-  else {
+  var authMiddleware;
+
+  if (options.https) {
     var serverOptions = {
       key: options.https.key,
       cert: options.https.cert,
@@ -61,30 +60,28 @@ module.exports = function (options) {
     };
 
     server = https.createServer(serverOptions, app);
-  }
 
-  var authMiddleware = function (req, res, next) {
-    req.device = {};
-    return next();
-  };
-
-  if (options.https) {
     authMiddleware = function(req, res, next) {
-      var fingerprint = req.connection.getPeerCertificate().fingerprint;
-
-      config.isAuthorized(fingerprint, function (err, device) {
-        if (err) { 
+      config.isAuthorized(routes.getFingerprint(req), function (err, device) {
+        if (err) {
           res.json({err: 'Internal Server Error'});
-          return next(err); 
+          return next(err);
         }
         if (!device) {
-          res.statusCode = 404;
-          res.json({err: 'Not Found'});
-          return next(new Error('Device is unpaired')); 
+          res.json(404, {err: 'Not Found'});
+          return next(new Error('Device is unpaired'));
         }
         next();
       });
     };
+
+  } else {
+    server = http.createServer(app);
+
+    authMiddleware = function (req, res, next) {
+      req.device = {};
+      return next();
+    };
   }
 
   routes.init({
diff --git a/lib/postgresql_interface.js b/lib/postgresql_interface.js
index 28a6a123..66970160 100644
--- a/lib/postgresql_interface.js
+++ b/lib/postgresql_interface.js
@@ -39,16 +39,16 @@ PostgresqlInterface.prototype.recordDeviceEvent =
     cb);
 };
 
-PostgresqlInterface.prototype.summonTransaction = 
+PostgresqlInterface.prototype.summonTransaction =
   function summonTransaction(deviceFingerprint, tx, cb) {
   // First do an INSERT
   // If it worked, go ahead with transaction
   // If duplicate, fetch status and return
   var self = this;
   this.client.query('INSERT INTO transactions (id, status, device_fingerprint, ' +
-      'to_address, satoshis, currency_code, fiat) ' + 
+      'to_address, satoshis, currency_code, fiat) ' +
       'VALUES ($1, $2, $3, $4, $5, $6, $7)', [tx.txId, 'pending', deviceFingerprint,
-      tx.toAddress, tx.satoshis, tx.currencyCode, tx.fiat], 
+      tx.toAddress, tx.satoshis, tx.currencyCode, tx.fiat],
       function (err) {
     if (err && PG_ERRORS[err.code] === 'uniqueViolation')
       return self._fetchTransaction(tx.txId, cb);
@@ -57,30 +57,30 @@ PostgresqlInterface.prototype.summonTransaction =
   });
 };
 
-PostgresqlInterface.prototype.reportTransactionError = 
+PostgresqlInterface.prototype.reportTransactionError =
   function reportTransactionError(tx, errString, status) {
-  this.client.query('UPDATE transactions SET status=$1, error=$2 WHERE id=$3', 
+  this.client.query('UPDATE transactions SET status=$1, error=$2 WHERE id=$3',
     [status, errString, tx.txId]);
 };
 
-PostgresqlInterface.prototype.completeTransaction = 
+PostgresqlInterface.prototype.completeTransaction =
   function completeTransaction(tx, txHash) {
   if (txHash)
-    this.client.query('UPDATE transactions SET tx_hash=$1, status=$2, completed=now() WHERE id=$3', 
+    this.client.query('UPDATE transactions SET tx_hash=$1, status=$2, completed=now() WHERE id=$3',
       [txHash, 'completed', tx.txId]);
   else
-    this.client.query('UPDATE transactions SET status=$1, error=$2 WHERE id=$3', 
-      ['failed', 'No txHash received', tx.txId]);    
+    this.client.query('UPDATE transactions SET status=$1, error=$2 WHERE id=$3',
+      ['failed', 'No txHash received', tx.txId]);
 };
 
-PostgresqlInterface.prototype._fetchTransaction = 
+PostgresqlInterface.prototype._fetchTransaction =
     function _fetchTransaction(txId, cb) {
   this.client.query('SELECT status, tx_hash, error FROM transactions WHERE id=$1',
       [txId], function (err, results) {
     if (err) return cb(err);
 
     // This should never happen, since we already checked for existence
-    if (results.rows.length === 0) return cb(new Error('Couldn\'t find transaction.')); 
+    if (results.rows.length === 0) return cb(new Error('Couldn\'t find transaction.'));
 
     var result = results.rows[0];
     cb(null, {txHash: result.tx_hash, err: result.error, status: result.status});
diff --git a/lib/routes.js b/lib/routes.js
index 5a98113b..5a2d87a1 100644
--- a/lib/routes.js
+++ b/lib/routes.js
@@ -3,82 +3,90 @@
 var _trader;
 var _lamassuConfig;
 var _idVerifier = null;
+var _trader = null;
 var logger = require('./logger');
 
+module.exports = {
+  init: init,
+  getFingerprint: getFingerprint
+};
+
 // Make sure these are higher than polling interval
 // or there will be a lot of errors
 var STALE_TICKER  = 180000;
 var STALE_BALANCE = 180000;
 
-var poll = function(req, res) {
+function poll(req, res) {
   var rateRec = _trader.rate();
   var balanceRec = _trader.balance;
   var fingerprint = getFingerprint(req);
-  var api = prepareApi(req, res);
 
   logger.debug('poll request from: %s', fingerprint);
 
   // `rateRec` and `balanceRec` are both objects, so there's no danger
   // of misinterpreting rate or balance === 0 as 'Server initializing'.
   if (!rateRec || !balanceRec) {
-    return api.respond('Server initializing');
+    return res.json({err: 'Server initializing'});
   }
 
   var now = Date.now();
   if (now - rateRec.timestamp > STALE_TICKER) {
-    return api.respond('Stale ticker');
+    return res.json({err: 'Stale ticker'});
   }
 
   if (now - balanceRec.timestamp > STALE_BALANCE) {
-    return api.respond('Stale balance');
+    return res.json({err: 'Stale balance'});
   }
 
   var rate = rateRec.rate;
-  if (rate === null) return api.respond('No rate available');
+  if (rate === null) return res.json({err: 'No rate available'});
   var fiatBalance = _trader.fiatBalance(fingerprint);
-  if (fiatBalance === null) return api.respond('No balance available');
+  if (fiatBalance === null) return res.json({err: 'No balance available'});
 
-  api.respond(null, {
+  res.json({
+    err: null,
     rate: rate * _trader.config.exchanges.settings.commission,
     fiat: fiatBalance,
     locale: _trader.config.brain.locale,
     txLimit: parseInt(_trader.config.exchanges.settings.compliance.maximum.limit, 10),
     idVerificationLimit: 0  // DEBUG
   });
-};
+}
 
-var trade = function (req, res) {
+function trade(req, res) {
   var fingerprint = getFingerprint(req);
-  var api = prepareApi(req, res);
   _trader.trade(req.body, fingerprint);
-  api.respond();
-};
 
-var deviceEvent = function deviceEvent(req, res) {
+  res.json({err: null});
+}
+
+function deviceEvent(req, res) {
   var fingerprint = req.connection.getPeerCertificate().fingerprint;
-  var api = prepareApi(req, res);
   _trader.event(req.body, fingerprint);
-  api.respond();
-};
+  res.json({err: null});
+}
 
-var idVerify = function idVerify(req, res) {
+function idVerify(req, res) {
   // var fingerprint = req.connection.getPeerCertificate().fingerprint;
-  var api = prepareApi(req, res);
   _idVerifier.verify(req.body, function (err, idResult) {
-    api.respond(err, idResult);
+    if (err)
+      return res.json({err: 'Verification failed'});
+    res.json(idResult);
   });
-};
+}
 
-var send = function(req, res) {
+function send(req, res) {
   var fingerprint = getFingerprint(req);
-  var api = prepareApi(req, res);
   _trader.sendBitcoins(fingerprint, req.body, function(err, txHash) {
-    api.respond(err, {txHash: txHash});
+    res.json({
+      err: err && err.message,
+      txHash: txHash,
+      errType: err && err.name
+    });
   });
-};
+}
 
-var pair = function(req, res) {
-  var api = prepareApi(req, res);
+function pair(req, res) {
   var token = req.body.token;
   var name = req.body.name;
 
@@ -87,13 +95,16 @@ var pair = function(req, res) {
     getFingerprint(req),
     name,
     function(err) {
-      if (err) return api.respond(err, null, 500);
-      api.respond();
+      if (err) {
+        return res.json(500, { err: err.message });
+      }
+
+      res.json(200);
     }
   );
-};
+}
 
-exports.init = function(config) {
+function init(config) {
   _lamassuConfig = config.lamassuConfig;
   _trader = config.trader;
 
@@ -113,9 +124,9 @@ exports.init = function(config) {
   app.post('/pair', pair);
 
   return app;
-};
+}
 
 function getFingerprint(req) {
-  return req.connection.getPeerCertificate &&
+  return typeof req.connection.getPeerCertificate === 'function' &&
     req.connection.getPeerCertificate().fingerprint;
 }
diff --git a/lib/trader.js b/lib/trader.js
index d8d13a70..3b27abea 100644
--- a/lib/trader.js
+++ b/lib/trader.js
@@ -21,7 +21,12 @@ var Trader = module.exports = function (db) {
 };
 
 Trader.prototype._findExchange = function (name) {
-  return require('lamassu-' + name);
+  try {
+    return require('lamassu-' + name);
+
+  } catch(_) {
+    throw new Error(name + ' module is not installed. Try running `npm install --save lamassu-' + name + '` first');
+  }
 };
 
 Trader.prototype._findTicker = function (name) {
@@ -98,7 +103,7 @@ Trader.prototype.configure = function (config) {
 };
 
 // IMPORTANT: This function returns the estimated minimum available balance
-// in fiat as of the start of the current user session on the device. User 
+// in fiat as of the start of the current user session on the device. User
 // session starts when a user presses then Start button and ends when we
 // send the bitcoins.
 Trader.prototype.fiatBalance = function (deviceFingerprint) {
@@ -120,7 +125,7 @@ Trader.prototype.fiatBalance = function (deviceFingerprint) {
   // `balance.transferBalance` is the balance of our transfer account (the one
   // we use to send Bitcoins to clients) in satoshis.
   var transferBalance = balance.transferBalance;
-  
+
   // Since `transferBalance` is in satoshis, we need to turn it into
   // bitcoins and then fiat to learn how much fiat currency we can exchange.
   //
@@ -188,7 +193,7 @@ Trader.prototype.sendBitcoins = function (deviceFingerprint, tx, cb) {
       if (txRec.status === 'insufficientFunds') txErr.name = 'InsufficientFunds';
     }
 
-    // transaction exists, but txHash might be null, 
+    // transaction exists, but txHash might be null,
     // in which case ATM should continue polling
     self.pollBalance();
     cb(txErr, txRec.txHash);
@@ -218,7 +223,7 @@ Trader.prototype.trade = function (rec, deviceFingerprint) {
         delete self._sessionInfo[deviceFingerprint];
       }, SESSION_TIMEOUT)
     };
-  } 
+  }
   this._tradeQueue.push({fiat: rec.fiat, satoshis: rec.satoshis, currency: rec.currency});
 };
 
@@ -296,7 +301,7 @@ Trader.prototype._tradeForexMultiplier = function _tradeForexMultiplier() {
 Trader.prototype._tradeBalanceFunc = function _tradeBalanceFunc(callback) {
   if (!this.tradeExchange) return callback(null, null);
   var forexMultiplier = this._tradeForexMultiplier();
-  if (!forexMultiplier) return callback(new Error('Can\'t compute balance, no tickers yet.')); 
+  if (!forexMultiplier) return callback(new Error('Can\'t compute balance, no tickers yet.'));
   this.tradeExchange.balance(function (err, localBalance) {
     if (err) return callback(err);
     callback(null, localBalance * forexMultiplier);
diff --git a/test/api/sendTest.js b/test/api/sendTest.js
index 182d7eb2..622e3d15 100644
--- a/test/api/sendTest.js
+++ b/test/api/sendTest.js
@@ -90,7 +90,7 @@ describe('send test', function() {
       'txs': []
     };
 
-    var payment_response = { 
+    var payment_response = {
       'message': 'Sent 0.1 BTC to 1LhkU2R8nJaU8Zj6jB8VjWrMpvVKGqCZ64',
       'tx_hash': 'f322d01ad784e5deeb25464a5781c3b20971c1863679ca506e702e3e33c18e9c',
       'notice': 'Some funds are pending confirmation and cannot be spent yet (Value 0.001 BTC)'
diff --git a/test/unit/traderFiatBalanceTest.js b/test/unit/traderFiatBalanceTest.js
index 12536f26..923e3671 100644
--- a/test/unit/traderFiatBalanceTest.js
+++ b/test/unit/traderFiatBalanceTest.js
@@ -74,7 +74,7 @@ describe('trader/fiatBalance', function() {
     assert.equal(fiatBalance, 150 / LOW_BALANCE_MARGIN);
   });
 
-  it('should calculate balance correctly with transfer and ' + 
+  it('should calculate balance correctly with transfer and ' +
       'trade exchange with different currencies', function() {
     var trader = new Trader(db);
     trader.configure({