diff --git a/lib/routes.js b/lib/routes.js
index c9f0ba29..5d93604d 100644
--- a/lib/routes.js
+++ b/lib/routes.js
@@ -17,6 +17,8 @@ const settingsLoader = require('./settings-loader')
 const plugins = require('./plugins')
 const helpers = require('./route-helpers')
 const poller = require('./poller')
+const Tx = require('./tx')
+
 const argv = require('minimist')(process.argv.slice(2))
 
 const CLOCK_SKEW = 60 * 1000
@@ -79,6 +81,12 @@ function poll (req, res, next) {
   .catch(next)
 }
 
+function postTx (req, res, next) {
+  return Tx.post(req.body)
+  .then(tx => res.json(tx))
+  .catch(next)
+}
+
 function trade (req, res, next) {
   const tx = req.body
   const pi = plugins(req.settings)
@@ -359,22 +367,13 @@ app.use(filterOldRequests)
 app.post('*', cacheAction)
 
 app.get('/poll', poll)
-app.post('/trade', trade)
-app.post('/send', send)
 app.post('/state', stateChange)
-app.post('/cash_out', cashOut)
-app.post('/dispense_ack', dispenseAck)
 
 app.post('/event', deviceEvent)
 app.post('/verify_user', verifyUser)
 app.post('/verify_transaction', verifyTx)
 
 app.post('/phone_code', phoneCode)
-app.post('/update_phone', updatePhone)
-app.get('/phone_tx', fetchPhoneTx)
-app.post('/register_redeem/:txId', registerRedeem)
-app.get('/await_dispense/:txId', waitForDispense)
-app.post('/dispense', dispense)
 
 app.use(errorHandler)
 app.use((req, res) => res.status(404).json({err: 'No such route'}))
diff --git a/lib/tx.js b/lib/tx.js
new file mode 100644
index 00000000..521bc9a3
--- /dev/null
+++ b/lib/tx.js
@@ -0,0 +1,36 @@
+const db = require('./db')
+const pgp = require('pg-promise')()
+
+function postCashIn (tx) {
+  const TransactionMode = pgp.txMode.TransactionMode
+  const isolationLevel = pgp.txMode.isolationLevel
+  const tmSRD = new TransactionMode({tiLevel: isolationLevel.serializable})
+
+  function transaction (t) {
+    const sql = 'select * from cash_in_txs where id=$1'
+    return t.one(sql, [tx.id])
+    .then(row => {
+      const newTx = executeTxChange(tx, row)
+
+      if (row) return updateCashOutTx(newTx)
+      insertCashOutTx(newTx)
+    })
+  }
+
+  transaction.txMode = tmSRD
+
+  return db.tx(transaction)
+  // retry failed
+}
+
+function postCashOut (tx) {
+
+}
+
+function post (tx) {
+  if (tx.direction === 'cashIn') return postCashIn(tx)
+  if (tx.direction === 'cashOut') return postCashOut(tx)
+  throw new Error('No such tx direction: %s', tx.direction)
+}
+
+module.exports = {post}