diff --git a/crates/core/src/database/auth.rs b/crates/core/src/database/auth.rs
index 05698ff..09fe643 100644
--- a/crates/core/src/database/auth.rs
+++ b/crates/core/src/database/auth.rs
@@ -128,6 +128,7 @@ impl DataManager {
             channel_mutes: serde_json::from_str(&get!(x->28(String)).to_string()).unwrap(),
             is_deactivated: get!(x->29(i32)) as i8 == 1,
             ban_expire: get!(x->30(i64)) as usize,
+            coins: get!(x->31(i32)),
         }
     }
 
@@ -284,7 +285,7 @@ impl DataManager {
 
         let res = execute!(
             &conn,
-            "INSERT INTO users VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18, $19, $20, $21, $22, $23, $24, $25, $26, $27, $28, $29, $30, $31)",
+            "INSERT INTO users VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18, $19, $20, $21, $22, $23, $24, $25, $26, $27, $28, $29, $30, $31, $32)",
             params![
                 &(data.id as i64),
                 &(data.created as i64),
@@ -317,6 +318,7 @@ impl DataManager {
                 &serde_json::to_string(&data.channel_mutes).unwrap(),
                 &if data.is_deactivated { 1_i32 } else { 0_i32 },
                 &(data.ban_expire as i64),
+                &(data.coins as i32)
             ]
         );
 
@@ -1058,6 +1060,7 @@ impl DataManager {
     auto_method!(update_user_ban_reason(&str)@get_user_by_id -> "UPDATE users SET ban_reason = $1 WHERE id = $2" --cache-key-tmpl=cache_clear_user);
     auto_method!(update_user_channel_mutes(Vec<usize>)@get_user_by_id -> "UPDATE users SET channel_mutes = $1 WHERE id = $2" --serde --cache-key-tmpl=cache_clear_user);
     auto_method!(update_user_ban_expire(i64)@get_user_by_id -> "UPDATE users SET ban_expire = $1 WHERE id = $2" --cache-key-tmpl=cache_clear_user);
+    auto_method!(update_user_coins(i32)@get_user_by_id -> "UPDATE users SET coins = $1 WHERE id = $2" --cache-key-tmpl=cache_clear_user);
 
     auto_method!(get_user_by_stripe_id(&str)@get_user_from_row -> "SELECT * FROM users WHERE stripe_id = $1" --name="user" --returns=User);
     auto_method!(update_user_stripe_id(&str)@get_user_by_id -> "UPDATE users SET stripe_id = $1 WHERE id = $2" --cache-key-tmpl=cache_clear_user);
diff --git a/crates/core/src/database/drivers/sql/create_users.sql b/crates/core/src/database/drivers/sql/create_users.sql
index e68a27c..4cb9b03 100644
--- a/crates/core/src/database/drivers/sql/create_users.sql
+++ b/crates/core/src/database/drivers/sql/create_users.sql
@@ -29,5 +29,6 @@ CREATE TABLE IF NOT EXISTS users (
     ban_reason TEXT NOT NULL,
     channel_mutes TEXT NOT NULL,
     is_deactivated INT NOT NULL,
-    ban_expire BIGINT NOT NULL
+    ban_expire BIGINT NOT NULL,
+    coins INT NOT NULL
 )
diff --git a/crates/core/src/database/drivers/sql/version_migrations.sql b/crates/core/src/database/drivers/sql/version_migrations.sql
index 5f3148c..47bcb04 100644
--- a/crates/core/src/database/drivers/sql/version_migrations.sql
+++ b/crates/core/src/database/drivers/sql/version_migrations.sql
@@ -33,3 +33,7 @@ ADD COLUMN IF NOT EXISTS ban_expire BIGINT DEFAULT 0;
 -- remove users seller_data
 ALTER TABLE users
 DROP COLUMN IF EXISTS seller_data;
+
+-- users coins
+ALTER TABLE users
+ADD COLUMN IF NOT EXISTS coins INT DEFAULT 0;
diff --git a/crates/core/src/database/economy.rs b/crates/core/src/database/economy.rs
new file mode 100644
index 0000000..f652e22
--- /dev/null
+++ b/crates/core/src/database/economy.rs
@@ -0,0 +1,91 @@
+use crate::model::economy::CoinTransfer;
+use crate::model::{Error, Result};
+use crate::{auto_method, DataManager};
+use oiseau::{cache::Cache, execute, get, params, query_rows, PostgresRow};
+
+impl DataManager {
+    /// Get a [`Letter`] from an SQL row.
+    pub(crate) fn get_transfer_from_row(x: &PostgresRow) -> CoinTransfer {
+        CoinTransfer {
+            id: get!(x->0(i64)) as usize,
+            created: get!(x->1(i64)) as usize,
+            sender: get!(x->2(i64)) as usize,
+            receiver: get!(x->3(i64)) as usize,
+            amount: get!(x->4(i32)),
+        }
+    }
+
+    auto_method!(get_transfer_by_id(usize as i64)@get_transfer_from_row -> "SELECT * FROM transfers WHERE id = $1" --name="transfer" --returns=CoinTransfer --cache-key-tmpl="atto.transfer:{}");
+
+    /// Get all transfers by user.
+    ///
+    /// # Arguments
+    /// * `id` - the ID of the user to fetch transfers for
+    /// * `batch` - the limit of items in each page
+    /// * `page` - the page number
+    pub async fn get_transfers_by_user(
+        &self,
+        id: usize,
+        batch: usize,
+        page: usize,
+    ) -> Result<Vec<CoinTransfer>> {
+        let conn = match self.0.connect().await {
+            Ok(c) => c,
+            Err(e) => return Err(Error::DatabaseConnection(e.to_string())),
+        };
+
+        let res = query_rows!(
+            &conn,
+            "SELECT * FROM transfers WHERE sender = $1 OR receiver = $1 ORDER BY created DESC LIMIT $2 OFFSET $3",
+            &[&(id as i64), &(batch as i64), &((page * batch) as i64)],
+            |x| { Self::get_transfer_from_row(x) }
+        );
+
+        if res.is_err() {
+            return Err(Error::GeneralNotFound("transfer".to_string()));
+        }
+
+        Ok(res.unwrap())
+    }
+
+    /// Create a new transfer in the database.
+    ///
+    /// # Arguments
+    /// * `data` - a mock [`Letter`] object to insert
+    pub async fn create_transfer(&self, data: CoinTransfer) -> Result<CoinTransfer> {
+        // check values
+        let mut sender = self.get_user_by_id(data.sender).await?;
+        let mut receiver = self.get_user_by_id(data.receiver).await?;
+        let (sender_bankrupt, receiver_bankrupt) = data.apply(&mut sender, &mut receiver);
+
+        if sender_bankrupt | receiver_bankrupt {
+            return Err(Error::MiscError(
+                "One party of this transfer cannot afford this".to_string(),
+            ));
+        }
+
+        // ...
+        let conn = match self.0.connect().await {
+            Ok(c) => c,
+            Err(e) => return Err(Error::DatabaseConnection(e.to_string())),
+        };
+
+        let res = execute!(
+            &conn,
+            "INSERT INTO transfers VALUES ($1, $2, $3, $4, $5)",
+            params![
+                &(data.id as i64),
+                &(data.created as i64),
+                &(data.sender as i64),
+                &(data.receiver as i64),
+                &data.amount
+            ]
+        );
+
+        if let Err(e) = res {
+            return Err(Error::DatabaseError(e.to_string()));
+        }
+
+        Ok(data)
+    }
+}
diff --git a/crates/core/src/database/mod.rs b/crates/core/src/database/mod.rs
index 5650d7d..c49a71f 100644
--- a/crates/core/src/database/mod.rs
+++ b/crates/core/src/database/mod.rs
@@ -9,6 +9,7 @@ pub mod connections;
 mod domains;
 mod drafts;
 mod drivers;
+mod economy;
 mod emojis;
 mod invite_codes;
 mod ipbans;
diff --git a/crates/core/src/model/auth.rs b/crates/core/src/model/auth.rs
index d730e13..680d059 100644
--- a/crates/core/src/model/auth.rs
+++ b/crates/core/src/model/auth.rs
@@ -92,6 +92,9 @@ pub struct User {
     /// The time at which the user's ban will automatically expire.
     #[serde(default)]
     pub ban_expire: usize,
+    /// The number of coins the user has.
+    #[serde(default)]
+    pub coins: i32,
 }
 
 pub type UserConnections =
@@ -397,6 +400,7 @@ impl User {
             channel_mutes: Vec::new(),
             is_deactivated: false,
             ban_expire: 0,
+            coins: 0,
         }
     }
 
diff --git a/crates/core/src/model/economy.rs b/crates/core/src/model/economy.rs
new file mode 100644
index 0000000..95d8e01
--- /dev/null
+++ b/crates/core/src/model/economy.rs
@@ -0,0 +1,36 @@
+use serde::{Serialize, Deserialize};
+use tetratto_shared::{snow::Snowflake, unix_epoch_timestamp};
+
+use super::auth::User;
+
+#[derive(Serialize, Deserialize)]
+pub struct CoinTransfer {
+    pub id: usize,
+    pub created: usize,
+    pub sender: usize,
+    pub receiver: usize,
+    pub amount: i32,
+}
+
+impl CoinTransfer {
+    /// Create a new [`CoinTransfer`].
+    pub fn new(sender: usize, receiver: usize, amount: i32) -> Self {
+        Self {
+            id: Snowflake::new().to_string().parse::<usize>().unwrap(),
+            created: unix_epoch_timestamp(),
+            sender,
+            receiver,
+            amount,
+        }
+    }
+
+    /// Apply the effects of this transaction onto the sender and receiver balances.
+    ///
+    /// # Returns
+    /// `(sender bankrupt, receiver bankrupt)`
+    pub fn apply(&self, sender: &mut User, receiver: &mut User) -> (bool, bool) {
+        sender.coins -= self.amount;
+        receiver.coins += self.amount;
+        (sender.coins < 0, receiver.coins < 0)
+    }
+}
diff --git a/crates/core/src/model/mod.rs b/crates/core/src/model/mod.rs
index b78dd37..9b46412 100644
--- a/crates/core/src/model/mod.rs
+++ b/crates/core/src/model/mod.rs
@@ -5,6 +5,7 @@ pub mod carp;
 pub mod channels;
 pub mod communities;
 pub mod communities_permissions;
+pub mod economy;
 pub mod journals;
 pub mod littleweb;
 pub mod mail;