diff --git a/bin/lamassu-cancel b/bin/lamassu-cancel
new file mode 100755
index 00000000..22434b91
--- /dev/null
+++ b/bin/lamassu-cancel
@@ -0,0 +1,25 @@
+#!/usr/bin/env node
+
+const uuid = require('@fczbkk/uuid4')
+
+const tx = require('../lib/cash-out-tx')
+
+const argv = process.argv.slice(2)
+
+if (argv.length !== 1) {
+  console.log('Usage: lamassu-cancel <tx-id>')
+  console.log('Cancels the cash out transaction with given tx-id so it cannot be dispensed.')
+  process.exit(1)
+}
+
+const txId = argv[0]
+
+if (!uuid.validate(txId)) {
+  console.log('tx-id must be valid uuid. e.g.: f8093ded-c542-4916-8ab5-6ebeceb287c1')
+  process.exit(2)
+}
+
+tx.cancel(txId)
+.then(() => console.log('Success.'))
+.catch(err => console.log(`Error: ${err.message}`))
+.then(() => process.exit(0))
diff --git a/lib/cash-out-tx.js b/lib/cash-out-tx.js
index 1b6457ec..49d315aa 100644
--- a/lib/cash-out-tx.js
+++ b/lib/cash-out-tx.js
@@ -12,7 +12,8 @@ module.exports = {
   post,
   monitorLiveIncoming,
   monitorStaleIncoming,
-  monitorUnnotified
+  monitorUnnotified,
+  cancel
 }
 
 const mapValuesWithKey = _.mapValues.convert({cap: false})
@@ -273,3 +274,21 @@ function monitorUnnotified (settings) {
   .then(txs => Promise.all(txs.map(notify)))
   .catch(logger.error)
 }
+
+function cancel (txId) {
+  const updateRec = {
+    'dispense_time': 'now()^',
+    dispense_error: 'Operator cancel',
+    dispensed: true
+  }
+
+  return Promise.resolve()
+  .then(() => {
+    return pgp.helpers.update(updateRec, null, 'cash_out_txs') +
+      pgp.as.format(' where id=$1', [txId])
+  })
+  .then(sql => db.result(sql, false))
+  .then(res => {
+    if (res.rowCount !== 1) throw new Error('No such tx-id')
+  })
+}
diff --git a/package.json b/package.json
index 3d7a7532..1f155976 100644
--- a/package.json
+++ b/package.json
@@ -6,6 +6,7 @@
   "license": "Unlicense",
   "author": "Lamassu (https://lamassu.is)",
   "dependencies": {
+    "@fczbkk/uuid4": "^3.0.0",
     "axios": "^0.16.1",
     "base-x": "^3.0.0",
     "bignumber.js": "^4.0.1",
@@ -56,7 +57,8 @@
     "lamassu-backup-pg": "./bin/lamassu-backup-pg",
     "lamassu-install-bitcoind": "./bin/lamassu-install-bitcoind",
     "lamassu-install-geth": "./bin/lamassu-install-geth",
-    "lamassu-mnemonic": "./bin/lamassu-mnemonic"
+    "lamassu-mnemonic": "./bin/lamassu-mnemonic",
+    "lamassu-cancel": "./bin/lamassu-cancel"
   },
   "scripts": {
     "test": "ava"
diff --git a/yarn.lock b/yarn.lock
index 1876b60c..312cb1d0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -37,6 +37,10 @@
     ansi-styles "^2.2.1"
     esutils "^2.0.2"
 
+"@fczbkk/uuid4@^3.0.0":
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/@fczbkk/uuid4/-/uuid4-3.0.0.tgz#964b221cb955e1cb0f044767a966828023a384bb"
+
 abbrev@1:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/abbrev/-/abbrev-1.1.0.tgz#d0554c2256636e2f56e7c2e5ad183f859428d81f"
@@ -1341,9 +1345,9 @@ dateformat@^1.0.12:
     get-stdin "^4.0.1"
     meow "^3.3.0"
 
-debug@2, debug@2.6.3, debug@^2.1.1:
-  version "2.6.3"
-  resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.3.tgz#0f7eb8c30965ec08c72accfa0130c8b79984141d"
+debug@2, debug@2.6.1, debug@^2.2.0, debug@^2.4.5:
+  version "2.6.1"
+  resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.1.tgz#79855090ba2c4e3115cc7d8769491d58f0491351"
   dependencies:
     ms "0.7.2"
 
@@ -1359,9 +1363,9 @@ debug@2.3.3:
   dependencies:
     ms "0.7.2"
 
-debug@2.6.1, debug@^2.2.0, debug@^2.4.5:
-  version "2.6.1"
-  resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.1.tgz#79855090ba2c4e3115cc7d8769491d58f0491351"
+debug@2.6.3, debug@^2.1.1:
+  version "2.6.3"
+  resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.3.tgz#0f7eb8c30965ec08c72accfa0130c8b79984141d"
   dependencies:
     ms "0.7.2"