diff --git a/lib/cash-in-tx.js b/lib/cash-in-tx.js
index f8b8643b..1b4777cf 100644
--- a/lib/cash-in-tx.js
+++ b/lib/cash-in-tx.js
@@ -72,7 +72,7 @@ function isMonotonic (oldField, newField, fieldKey) {
 
 function ensureRatchet (oldField, newField, fieldKey) {
   const monotonic = ['cryptoAtoms', 'fiat', 'send', 'sendConfirmed', 'operatorCompleted', 'timedout']
-  const free = ['sendPending', 'error', 'errorCode']
+  const free = ['sendPending', 'error', 'errorCode', 'customerId']
 
   if (_.isNil(oldField)) return true
   if (_.includes(fieldKey, monotonic)) return isMonotonic(oldField, newField, fieldKey)
diff --git a/lib/customers.js b/lib/customers.js
new file mode 100644
index 00000000..47cdccd1
--- /dev/null
+++ b/lib/customers.js
@@ -0,0 +1,35 @@
+const db = require('./db')
+const uuid = require('uuid')
+const _ = require('lodash/fp')
+const BN = require('./bn')
+
+function add (customer) {
+  const sql = 'insert into customers (id, phone, phone_at) values ($1, $2, now()) returning *'
+  return db.one(sql, [uuid.v4(), customer.phone])
+}
+
+function get (phone) {
+  const sql = 'select id, phone from customers where phone=$1'
+  return db.oneOrNone(sql, [phone])
+  .then(customer => {
+    if (!customer) return
+    return getDailyVolume(customer.id).then(dailyVolume => {
+      return _.set('dailyVolume', dailyVolume, customer)
+    })
+  })
+}
+
+function getDailyVolume (id) {
+  return Promise.all([
+    db.one(`select coalesce(sum(fiat), 0) as total from cash_in_txs 
+           where customer_id=$1 
+           and created > now() - interval '1 day'`, [id]),
+    db.one(`select COALESCE(sum(fiat), 0) as total from cash_out_txs 
+           where customer_id=$1 
+           and created > now() - interval '1 day'`, [id])
+  ]).then(([cashInTotal, cashOutTotal]) => {
+    return BN(cashInTotal.total).add(cashOutTotal.total)
+  })
+}
+
+module.exports = { add, get }
diff --git a/lib/routes.js b/lib/routes.js
index c5969d0e..d80c3efc 100644
--- a/lib/routes.js
+++ b/lib/routes.js
@@ -15,6 +15,7 @@ const plugins = require('./plugins')
 const helpers = require('./route-helpers')
 const poller = require('./poller')
 const Tx = require('./tx')
+const customers = require('./customers')
 
 const argv = require('minimist')(process.argv.slice(2))
 
@@ -138,6 +139,24 @@ function verifyTx (req, res, next) {
   .catch(next)
 }
 
+function getCustomerWithPhoneCode (req, res, next) {
+  const pi = plugins(req.settings, req.deviceId)
+  const phone = req.body.phone
+  return pi.getPhoneCode(phone)
+  .then(code => {
+    return customers.get(phone.phone).then(customer => {
+      if (customer) return respond(req, res, {code, customer})
+      return customers.add(req.body)
+      .then(customer => respond(req, res, {code, customer}))
+    })
+  })
+  .catch(err => {
+    if (err.name === 'BadNumberError') throw httpError('Bad number', 410)
+    throw err
+  })
+  .catch(next)
+}
+
 function ca (req, res) {
   const token = req.query.token
 
@@ -264,7 +283,7 @@ app.post('/event', deviceEvent)
 app.post('/verify_user', verifyUser)
 app.post('/verify_transaction', verifyTx)
 
-app.post('/phone_code', phoneCode)
+app.post('/phone_code', getCustomerWithPhoneCode)
 app.post('/tx', postTx)
 app.get('/tx/:id', getTx)
 app.get('/tx', getPhoneTx)