diff --git a/lib/Pear/LocalLoop.pm b/lib/Pear/LocalLoop.pm
index 32814cf..33742aa 100644
--- a/lib/Pear/LocalLoop.pm
+++ b/lib/Pear/LocalLoop.pm
@@ -149,6 +149,7 @@ sub startup {
   $api->post('/user/account')->to('api-user#post_account_update');
   $api->post('/user-history')->to('api-user#post_user_history');
   $api->post('/stats')->to('api-stats#post_index');
+  $api->post('/stats/category')->to('api-categories#post_category_list');
   $api->post('/stats/customer')->to('api-stats#post_customer');
   $api->post('/stats/leaderboard')->to('api-stats#post_leaderboards');
   $api->post('/stats/leaderboard/paged')->to('api-stats#post_leaderboards_paged');
diff --git a/lib/Pear/LocalLoop/Controller/Admin/Categories.pm b/lib/Pear/LocalLoop/Controller/Admin/Categories.pm
index b37900d..529239c 100644
--- a/lib/Pear/LocalLoop/Controller/Admin/Categories.pm
+++ b/lib/Pear/LocalLoop/Controller/Admin/Categories.pm
@@ -57,6 +57,7 @@ sub read {
 sub update {
   my $c = shift;
   my $validation = $c->validation;
+  $validation->required('id');
   $validation->required('category', 'trim')->like(qr/^[\w]*$/);
 
   my $id = $c->param('id');
@@ -67,10 +68,11 @@ sub update {
     $c->redirect_to( '/admin/categories/' . $id );
   } elsif ( my $category = $c->result_set->find($id) ) {
     $category->update({
+      id => $validation->param('id'),
       name => $validation->param('category'),
     });
     $c->flash( success => 'Category Updated' );
-    $c->redirect_to( '/admin/categories/' . $id );
+    $c->redirect_to( '/admin/categories/' . $validation->param('id') );
   } else {
     $c->flash( error => 'No Category found' );
     $c->redirect_to( '/admin/categories' );
diff --git a/lib/Pear/LocalLoop/Controller/Api/Categories.pm b/lib/Pear/LocalLoop/Controller/Api/Categories.pm
new file mode 100644
index 0000000..8e52d4b
--- /dev/null
+++ b/lib/Pear/LocalLoop/Controller/Api/Categories.pm
@@ -0,0 +1,78 @@
+package Pear::LocalLoop::Controller::Api::Categories;
+use Mojo::Base 'Mojolicious::Controller';
+
+use List::Util qw/ max /;
+
+sub post_category_list {
+  my $c = shift;
+
+  my $entity = $c->stash->{api_user}->entity;
+
+  my $duration = DateTime::Duration->new( days => 28 );
+  my $end = DateTime->today;
+  my $start = $end->clone->subtract_duration( $duration );
+
+  my $dtf = $c->schema->storage->datetime_parser;
+  my $driver = $c->schema->storage->dbh->{Driver}->{Name};
+  my $month_transaction_rs = $c->schema->resultset('ViewQuantisedTransactionCategory' . $driver)->search(
+    {
+      purchase_time => {
+        -between => [
+          $dtf->format_datetime($start),
+          $dtf->format_datetime($end),
+        ],
+      },
+      buyer_id => $entity->id,
+    },
+    {
+      columns => [
+        {
+          quantised        => 'quantised_weeks',
+          value            => 'value',
+          category_id      => 'category_id',
+        }
+      ],
+      group_by => [ qw/ category_id quantised_weeks / ],
+      order_by => { '-desc' => 'quantised_weeks' },
+    }
+  );
+
+  my $data = {};
+
+  for ( $month_transaction_rs->all ) {
+    my $quantised = $c->db_datetime_parser->parse_datetime($_->get_column('quantised'));
+    my $days = $c->format_iso_date( $quantised ) || 0;
+    my $category = $_->get_column('category_id') || 0;
+    my $value = ($_->get_column('value') || 0) / 100000;
+    $data->{$days} = [] unless exists $data->{$days};
+    push @{ $data->{$days} }, {
+      days => $days,
+      value => $value,
+      category => $category,
+    };
+  }
+
+  return $c->render(
+    json => {
+      success => Mojo::JSON->true,
+      data => $data,
+    }
+  );
+}
+
+sub pg_or_sqlite {
+  my ( $c, $pg_sql, $sqlite_sql ) = @_;
+
+  my $driver = $c->schema->storage->dbh->{Driver}->{Name};
+
+  if ( $driver eq 'Pg' ) {
+    return \$pg_sql;
+  } elsif ( $driver eq 'SQLite' ) {
+    return \$sqlite_sql;
+  } else {
+    $c->app->log->warn('Unknown Driver Used');
+    return undef;
+  }
+}
+
+1;
diff --git a/lib/Pear/LocalLoop/Schema/Result/ViewQuantisedTransactionCategoryPg.pm b/lib/Pear/LocalLoop/Schema/Result/ViewQuantisedTransactionCategoryPg.pm
new file mode 100644
index 0000000..2ae0445
--- /dev/null
+++ b/lib/Pear/LocalLoop/Schema/Result/ViewQuantisedTransactionCategoryPg.pm
@@ -0,0 +1,26 @@
+package Pear::LocalLoop::Schema::Result::ViewQuantisedTransactionCategoryPg;
+
+use strict;
+use warnings;
+
+use base 'DBIx::Class::Core';
+
+__PACKAGE__->table_class('DBIx::Class::ResultSource::View');
+__PACKAGE__->table('view_quantised_transactions');
+__PACKAGE__->result_source_instance->is_virtual(1);
+
+__PACKAGE__->result_source_instance->view_definition( qq/
+SELECT "transactions.value",
+       "transactions.distance",
+       "transactions.purchase_time",
+       "transactions.buyer_id",
+       "transactions.seller_id",
+       "transaction_category.category_id",
+       DATE_TRUNC('hour', "transactions.purchase_time") AS "quantised_hours",
+       DATE_TRUNC('day', "transactions.purchase_time") AS "quantised_days",
+       DATE_TRUNC('week', "transactions.purchase_time") AS "quantised_weeks"
+  FROM "transactions"
+LEFT JOIN "transaction_category" ON "transactions.id" = "transaction_category.transaction_id"
+/);
+
+1;
diff --git a/lib/Pear/LocalLoop/Schema/Result/ViewQuantisedTransactionCategorySQLite.pm b/lib/Pear/LocalLoop/Schema/Result/ViewQuantisedTransactionCategorySQLite.pm
new file mode 100644
index 0000000..fcef5a2
--- /dev/null
+++ b/lib/Pear/LocalLoop/Schema/Result/ViewQuantisedTransactionCategorySQLite.pm
@@ -0,0 +1,26 @@
+package Pear::LocalLoop::Schema::Result::ViewQuantisedTransactionCategorySQLite;
+
+use strict;
+use warnings;
+
+use base 'DBIx::Class::Core';
+
+__PACKAGE__->table_class('DBIx::Class::ResultSource::View');
+__PACKAGE__->table('view_quantised_transactions');
+__PACKAGE__->result_source_instance->is_virtual(1);
+
+__PACKAGE__->result_source_instance->view_definition( qq/
+SELECT "transactions"."value",
+       "transactions"."distance",
+       "transactions"."purchase_time",
+       "transactions"."buyer_id",
+       "transactions"."seller_id",
+       "transaction_category"."category_id",
+       DATETIME(STRFTIME('%Y-%m-%d %H:00:00',"transactions"."purchase_time")) AS "quantised_hours",
+       DATETIME(STRFTIME('%Y-%m-%d 00:00:00',"transactions"."purchase_time")) AS "quantised_days",
+       DATETIME(STRFTIME('%Y-%m-%d 00:00:00',"transactions"."purchase_time", 'weekday 1')) AS "quantised_weeks"
+  FROM "transactions"
+LEFT JOIN "transaction_category" ON "transactions"."id" = "transaction_category"."transaction_id"
+/);
+
+1;
diff --git a/t/api/categories.t b/t/api/categories.t
new file mode 100644
index 0000000..fe2c751
--- /dev/null
+++ b/t/api/categories.t
@@ -0,0 +1,98 @@
+use Mojo::Base -strict;
+
+BEGIN {
+  use Test::MockTime qw/ set_absolute_time /;
+}
+
+use FindBin qw/ $Bin /;
+
+use Test::More;
+use Mojo::JSON;
+use Test::Pear::LocalLoop;
+use DateTime;
+
+my $framework = Test::Pear::LocalLoop->new(
+  etc_dir => "$Bin/../etc",
+);
+$framework->install_fixtures('users');
+
+my $t = $framework->framework;
+my $schema = $t->app->schema;
+
+set_absolute_time('2017-01-02T00:00:00Z');
+
+my $start = DateTime->today->subtract( hours => 12 );
+
+# create 40 days worth of data
+for my $count ( 0 .. 28 ) {
+  my $trans_day = $start->clone->subtract( days => $count );
+
+  create_random_transaction( 'test1@example.com', $trans_day );
+  if ( $count % 2 ) {
+    create_random_transaction( 'test1@example.com', $trans_day );
+  }
+  if ( $count % 3 ) {
+    create_random_transaction( 'test1@example.com', $trans_day );
+  }
+  if ( $count % 4 ) {
+    create_random_transaction( 'test1@example.com', $trans_day );
+  }
+}
+
+my $session_key = $framework->login({
+  email => 'test1@example.com',
+  password => 'abc123',
+});
+
+$t->post_ok('/api/stats/category' => json => {
+    session_key => $session_key,
+  })
+  ->status_is(200)->or($framework->dump_error)
+  ->json_is('/data', {
+    "2016-12-05" => [{
+      days => "2016-12-05",
+      value => 10,
+      category => 1,
+    }],
+    "2016-12-12" => [{
+      days => "2016-12-12",
+      value => 10,
+      category => 1,
+    }],
+    "2016-12-19" => [{
+      days => "2016-12-19",
+      value => 10,
+      category => 1,
+    }],
+    "2016-12-26" => [{
+      days => "2016-12-26",
+      value => 10,
+      category => 1,
+    }],
+    "2017-01-02" => [{
+      days => "2017-01-02",
+      value => 10,
+      category => 1,
+    }]
+  })->or($framework->dump_error);
+
+sub create_random_transaction {
+  my $buyer = shift;
+  my $time = shift;
+
+  my $buyer_result = $schema->resultset('User')->find({ email => $buyer })->entity;
+  my $seller_result = $schema->resultset('Organisation')->find({ name => 'Test Org' })->entity;
+  my $test_transaction = $schema->resultset('Transaction')->create({
+    buyer => $buyer_result,
+    seller => $seller_result,
+    value => 10 * 100000,
+    proof_image => 'a',
+    purchase_time => $time,
+  });
+  $schema->resultset('TransactionCategory')->create({
+    category_id => 1,
+    transaction_id => $test_transaction->id,
+  });
+}
+
+done_testing;
diff --git a/templates/admin/categories/read.html.ep b/templates/admin/categories/read.html.ep
index 2cf8af0..5e32820 100644
--- a/templates/admin/categories/read.html.ep
+++ b/templates/admin/categories/read.html.ep
@@ -16,6 +16,11 @@
     <label for="category-name">Token Name</label>
     <input id="category-name" type="text" class="form-control" placeholder="Token Text" name="category" value="<%= $category->name %>">
   </div>
+  <div class="form-group">
+    <label for="category-id">Token ID</label>
+    <input id="category-id" type="text" class="form-control" placeholder="Token ID" name="id" value="<%= $category->id %>">
+    <p class="help-block">Do not change the ID unless <strong>absolutely</strong> necessary.</p>
+  </div>
   <div class="form-group">
     <button class="btn btn-primary form-control" type="submit">Update</button>
   </div>