diff --git a/src/config.rs b/src/config.rs
index 8e2aa73..c8d9fe9 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -1,5 +1,6 @@
-use crate::types::alpaca::shared::Source;
+use crate::types::alpaca::shared::{Mode, Source};
 use governor::{DefaultDirectRateLimiter, Quota, RateLimiter};
+use lazy_static::lazy_static;
 use reqwest::{
     header::{HeaderMap, HeaderName, HeaderValue},
     Client,
@@ -14,20 +15,35 @@ use rust_bert::{
 use std::{env, num::NonZeroU32, path::PathBuf, sync::Arc};
 use tokio::sync::Mutex;
 
-pub const ALPACA_ACCOUNT_API_URL: &str = "https://api.alpaca.markets/v2/account";
-pub const ALPACA_ASSET_API_URL: &str = "https://api.alpaca.markets/v2/assets";
-pub const ALPACA_ORDER_API_URL: &str = "https://api.alpaca.markets/v2/orders";
-pub const ALPACA_POSITION_API_URL: &str = "https://api.alpaca.markets/v2/positions";
-pub const ALPACA_CLOCK_API_URL: &str = "https://api.alpaca.markets/v2/clock";
+lazy_static! {
+    pub static ref ALPACA_MODE: Mode = env::var("ALPACA_MODE")
+        .expect("ALPACA_MODE must be set.")
+        .parse()
+        .expect("ALPACA_MODE must be 'live' or 'paper'");
+    static ref ALPACA_URL_SUBDOMAIN: String = match *ALPACA_MODE {
+        Mode::Live => String::from("api"),
+        Mode::Paper => String::from("paper-api"),
+    };
+    #[derive(Debug)]
+    pub static ref ALPACA_API_URL: String = format!(
+        "https://{subdomain}.alpaca.markets/v2",
+        subdomain = *ALPACA_URL_SUBDOMAIN
+    );
+    #[derive(Debug)]
+    pub static ref ALPACA_WEBSOCKET_URL: String = format!(
+        "wss://{subdomain}.alpaca.markets/stream",
+        subdomain = *ALPACA_URL_SUBDOMAIN
+    );
+}
 
-pub const ALPACA_STOCK_DATA_URL: &str = "https://data.alpaca.markets/v2/stocks/bars";
-pub const ALPACA_CRYPTO_DATA_URL: &str = "https://data.alpaca.markets/v1beta3/crypto/us/bars";
-pub const ALPACA_NEWS_DATA_URL: &str = "https://data.alpaca.markets/v1beta1/news";
+pub const ALPACA_STOCK_DATA_API_URL: &str = "https://data.alpaca.markets/v2/stocks/bars";
+pub const ALPACA_CRYPTO_DATA_API_URL: &str = "https://data.alpaca.markets/v1beta3/crypto/us/bars";
+pub const ALPACA_NEWS_DATA_API_URL: &str = "https://data.alpaca.markets/v1beta1/news";
 
-pub const ALPACA_TRADING_WEBSOCKET_URL: &str = "wss://api.alpaca.markets/stream";
-pub const ALPACA_STOCK_WEBSOCKET_URL: &str = "wss://stream.data.alpaca.markets/v2";
-pub const ALPACA_CRYPTO_WEBSOCKET_URL: &str = "wss://stream.data.alpaca.markets/v1beta3/crypto/us";
-pub const ALPACA_NEWS_WEBSOCKET_URL: &str = "wss://stream.data.alpaca.markets/v1beta1/news";
+pub const ALPACA_STOCK_DATA_WEBSOCKET_URL: &str = "wss://stream.data.alpaca.markets/v2";
+pub const ALPACA_CRYPTO_DATA_WEBSOCKET_URL: &str =
+    "wss://stream.data.alpaca.markets/v1beta3/crypto/us";
+pub const ALPACA_NEWS_DATA_WEBSOCKET_URL: &str = "wss://stream.data.alpaca.markets/v1beta1/news";
 
 pub struct Config {
     pub alpaca_api_key: String,
diff --git a/src/init.rs b/src/init.rs
new file mode 100644
index 0000000..e8d8b55
--- /dev/null
+++ b/src/init.rs
@@ -0,0 +1,103 @@
+use crate::{
+    config::{Config, ALPACA_MODE},
+    database,
+    types::alpaca::{self, api, shared::Sort},
+};
+use log::{info, warn};
+use std::{collections::HashSet, sync::Arc};
+use time::OffsetDateTime;
+
+pub async fn check_account(config: &Arc<Config>) {
+    let account = alpaca::api::incoming::account::get(config, None)
+        .await
+        .unwrap();
+
+    assert!(
+        !(account.status != alpaca::api::incoming::account::Status::Active),
+        "Account status is not active: {:?}.",
+        account.status
+    );
+    assert!(
+        !account.trade_suspend_by_user,
+        "Account trading is suspended by user."
+    );
+    assert!(!account.trading_blocked, "Account trading is blocked.");
+    assert!(!account.blocked, "Account is blocked.");
+
+    if account.cash == 0.0 {
+        warn!("Account cash is zero, qrust will not be able to trade.");
+    }
+
+    warn!(
+        "qrust active on {} account with {} {}, avoid transferring funds without shutting down.",
+        *ALPACA_MODE, account.currency, account.cash
+    );
+}
+
+pub async fn rehydrate_orders(config: &Arc<Config>) {
+    info!("Rehydrating order data.");
+
+    let mut orders = vec![];
+    let mut after = OffsetDateTime::UNIX_EPOCH;
+
+    while let Some(message) = api::incoming::order::get(
+        config,
+        &api::outgoing::order::Order {
+            status: Some(api::outgoing::order::Status::All),
+            limit: Some(500),
+            after: Some(after),
+            until: None,
+            direction: Some(Sort::Asc),
+            nested: Some(true),
+            symbols: None,
+            side: None,
+        },
+        None,
+    )
+    .await
+    .ok()
+    .filter(|message| !message.is_empty())
+    {
+        orders.extend(message);
+        after = orders.last().unwrap().submitted_at;
+    }
+
+    let orders = orders
+        .into_iter()
+        .flat_map(&api::incoming::order::Order::normalize)
+        .collect::<Vec<_>>();
+
+    database::orders::upsert_batch(&config.clickhouse_client, &orders)
+        .await
+        .unwrap();
+
+    info!("Rehydrated order data.");
+}
+
+pub async fn check_positions(config: &Arc<Config>) {
+    let positions_future = async {
+        alpaca::api::incoming::position::get(config, None)
+            .await
+            .unwrap()
+    };
+
+    let assets_future = async {
+        database::assets::select(&config.clickhouse_client)
+            .await
+            .unwrap()
+            .into_iter()
+            .map(|asset| asset.symbol)
+            .collect::<HashSet<_>>()
+    };
+
+    let (positions, assets) = tokio::join!(positions_future, assets_future);
+
+    for position in positions {
+        if !assets.contains(&position.symbol) {
+            warn!(
+                "Position for unmonitored asset: {}, {} shares.",
+                position.symbol, position.qty
+            );
+        }
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index 0bf5aeb..6d1a730 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -4,6 +4,7 @@
 
 mod config;
 mod database;
+mod init;
 mod routes;
 mod threads;
 mod types;
@@ -33,8 +34,9 @@ async fn main() {
     )
     .unwrap();
 
-    threads::trading::check_account(&config).await;
-    threads::trading::check_positions(&config).await;
+    init::check_account(&config).await;
+    init::rehydrate_orders(&config).await;
+    init::check_positions(&config).await;
 
     spawn(threads::trading::run(config.clone()));
 
diff --git a/src/threads/data/backfill.rs b/src/threads/data/backfill.rs
index 7d2947a..ee48354 100644
--- a/src/threads/data/backfill.rs
+++ b/src/threads/data/backfill.rs
@@ -1,6 +1,6 @@
 use super::ThreadType;
 use crate::{
-    config::{Config, ALPACA_CRYPTO_DATA_URL, ALPACA_STOCK_DATA_URL},
+    config::{Config, ALPACA_CRYPTO_DATA_API_URL, ALPACA_STOCK_DATA_API_URL},
     database,
     types::{
         alpaca::{
@@ -77,6 +77,7 @@ pub async fn run(handler: Arc<Box<dyn Handler>>, mut receiver: mpsc::Receiver<Me
 
     loop {
         let message = receiver.recv().await.unwrap();
+
         spawn(handle_backfill_message(
             handler.clone(),
             backfill_jobs.clone(),
@@ -414,12 +415,12 @@ pub fn create_handler(thread_type: ThreadType, config: Arc<Config>) -> Box<dyn H
     match thread_type {
         ThreadType::Bars(Class::UsEquity) => Box::new(BarHandler {
             config,
-            data_url: ALPACA_STOCK_DATA_URL,
+            data_url: ALPACA_STOCK_DATA_API_URL,
             api_query_constructor: us_equity_query_constructor,
         }),
         ThreadType::Bars(Class::Crypto) => Box::new(BarHandler {
             config,
-            data_url: ALPACA_CRYPTO_DATA_URL,
+            data_url: ALPACA_CRYPTO_DATA_API_URL,
             api_query_constructor: crypto_query_constructor,
         }),
         ThreadType::News => Box::new(NewsHandler { config }),
diff --git a/src/threads/data/mod.rs b/src/threads/data/mod.rs
index 41557bc..8d78fc2 100644
--- a/src/threads/data/mod.rs
+++ b/src/threads/data/mod.rs
@@ -4,7 +4,8 @@ mod websocket;
 use super::clock;
 use crate::{
     config::{
-        Config, ALPACA_CRYPTO_WEBSOCKET_URL, ALPACA_NEWS_WEBSOCKET_URL, ALPACA_STOCK_WEBSOCKET_URL,
+        Config, ALPACA_CRYPTO_DATA_WEBSOCKET_URL, ALPACA_NEWS_DATA_WEBSOCKET_URL,
+        ALPACA_STOCK_DATA_WEBSOCKET_URL,
     },
     create_send_await, database,
     types::{alpaca, Asset, Class},
@@ -99,10 +100,13 @@ async fn init_thread(
 ) {
     let websocket_url = match thread_type {
         ThreadType::Bars(Class::UsEquity) => {
-            format!("{}/{}", ALPACA_STOCK_WEBSOCKET_URL, &config.alpaca_source)
+            format!(
+                "{}/{}",
+                ALPACA_STOCK_DATA_WEBSOCKET_URL, &config.alpaca_source
+            )
         }
-        ThreadType::Bars(Class::Crypto) => ALPACA_CRYPTO_WEBSOCKET_URL.into(),
-        ThreadType::News => ALPACA_NEWS_WEBSOCKET_URL.into(),
+        ThreadType::Bars(Class::Crypto) => ALPACA_CRYPTO_DATA_WEBSOCKET_URL.into(),
+        ThreadType::News => ALPACA_NEWS_DATA_WEBSOCKET_URL.into(),
     };
 
     let (websocket, _) = connect_async(websocket_url).await.unwrap();
diff --git a/src/threads/data/websocket.rs b/src/threads/data/websocket.rs
index fa725df..26bc702 100644
--- a/src/threads/data/websocket.rs
+++ b/src/threads/data/websocket.rs
@@ -186,9 +186,7 @@ async fn handle_websocket_message(
 ) {
     match message {
         tungstenite::Message::Text(message) => {
-            let message = from_str::<Vec<websocket::data::incoming::Message>>(&message);
-
-            if let Ok(message) = message {
+            if let Ok(message) = from_str::<Vec<websocket::data::incoming::Message>>(&message) {
                 for message in message {
                     let handler = handler.clone();
                     let pending = pending.clone();
diff --git a/src/threads/trading/mod.rs b/src/threads/trading/mod.rs
index 725c9a6..69db55e 100644
--- a/src/threads/trading/mod.rs
+++ b/src/threads/trading/mod.rs
@@ -1,78 +1,21 @@
-mod rehydrate;
 mod websocket;
 
 use crate::{
-    config::{Config, ALPACA_TRADING_WEBSOCKET_URL},
-    database,
+    config::{Config, ALPACA_WEBSOCKET_URL},
     types::alpaca,
 };
 use futures_util::StreamExt;
-use log::warn;
-use rehydrate::rehydrate;
-use std::{collections::HashSet, sync::Arc};
+use std::sync::Arc;
 use tokio::spawn;
 use tokio_tungstenite::connect_async;
 
 pub async fn run(config: Arc<Config>) {
-    let (websocket, _) = connect_async(ALPACA_TRADING_WEBSOCKET_URL).await.unwrap();
+    let (websocket, _) = connect_async(&*ALPACA_WEBSOCKET_URL).await.unwrap();
     let (mut websocket_sink, mut websocket_stream) = websocket.split();
 
     alpaca::websocket::trading::authenticate(&config, &mut websocket_sink, &mut websocket_stream)
         .await;
     alpaca::websocket::trading::subscribe(&mut websocket_sink, &mut websocket_stream).await;
 
-    rehydrate(&config).await;
     spawn(websocket::run(config, websocket_stream, websocket_sink));
 }
-
-pub async fn check_account(config: &Arc<Config>) {
-    let account = alpaca::api::incoming::account::get(config, None)
-        .await
-        .unwrap();
-
-    assert!(
-        !(account.status != alpaca::api::incoming::account::Status::Active),
-        "Account status is not active: {:?}.",
-        account.status
-    );
-    assert!(
-        !account.trade_suspend_by_user,
-        "Account trading is suspended by user."
-    );
-    assert!(!account.trading_blocked, "Account trading is blocked.");
-    assert!(!account.blocked, "Account is blocked.");
-
-    if account.cash == 0.0 {
-        warn!("Account cash is zero, qrust will not be able to trade.");
-    }
-
-    warn!(
-        "qrust active with {}{}, avoid transferring funds without shutting down.",
-        account.cash, account.currency
-    );
-}
-
-pub async fn check_positions(config: &Arc<Config>) {
-    let positions_future = async {
-        alpaca::api::incoming::position::get(config, None)
-            .await
-            .unwrap()
-    };
-
-    let assets_future = async {
-        database::assets::select(&config.clickhouse_client)
-            .await
-            .unwrap()
-            .into_iter()
-            .map(|asset| asset.symbol)
-            .collect::<HashSet<_>>()
-    };
-
-    let (positions, assets) = tokio::join!(positions_future, assets_future);
-
-    for position in positions {
-        if !assets.contains(&position.symbol) {
-            warn!("Position for unmonitored asset: {:?}", position.symbol);
-        }
-    }
-}
diff --git a/src/threads/trading/rehydrate.rs b/src/threads/trading/rehydrate.rs
deleted file mode 100644
index 8fa4e34..0000000
--- a/src/threads/trading/rehydrate.rs
+++ /dev/null
@@ -1,48 +0,0 @@
-use crate::{
-    config::Config,
-    database,
-    types::alpaca::{api, shared::Sort},
-};
-use log::info;
-use std::sync::Arc;
-use time::OffsetDateTime;
-
-pub async fn rehydrate(config: &Arc<Config>) {
-    info!("Rehydrating trading data.");
-
-    let mut orders = vec![];
-    let mut after = OffsetDateTime::UNIX_EPOCH;
-
-    while let Some(message) = api::incoming::order::get(
-        config,
-        &api::outgoing::order::Order {
-            status: Some(api::outgoing::order::Status::All),
-            limit: Some(500),
-            after: Some(after),
-            until: None,
-            direction: Some(Sort::Asc),
-            nested: Some(true),
-            symbols: None,
-            side: None,
-        },
-        None,
-    )
-    .await
-    .ok()
-    .filter(|message| !message.is_empty())
-    {
-        orders.extend(message);
-        after = orders.last().unwrap().submitted_at;
-    }
-
-    let orders = orders
-        .into_iter()
-        .flat_map(&api::incoming::order::Order::normalize)
-        .collect::<Vec<_>>();
-
-    database::orders::upsert_batch(&config.clickhouse_client, &orders)
-        .await
-        .unwrap();
-
-    info!("Rehydrated trading data.");
-}
diff --git a/src/types/alpaca/api/incoming/account.rs b/src/types/alpaca/api/incoming/account.rs
index 8c2eeec..fccb963 100644
--- a/src/types/alpaca/api/incoming/account.rs
+++ b/src/types/alpaca/api/incoming/account.rs
@@ -1,3 +1,4 @@
+use crate::config::{Config, ALPACA_API_URL};
 use backoff::{future::retry_notify, ExponentialBackoff};
 use log::warn;
 use reqwest::Error;
@@ -9,8 +10,6 @@ use std::{sync::Arc, time::Duration};
 use time::OffsetDateTime;
 use uuid::Uuid;
 
-use crate::config::{Config, ALPACA_ACCOUNT_API_URL};
-
 #[derive(Deserialize, Debug, PartialEq, Eq)]
 #[serde(rename_all = "SCREAMING_SNAKE_CASE")]
 pub enum Status {
@@ -90,7 +89,7 @@ pub async fn get(
             config.alpaca_rate_limit.until_ready().await;
             config
                 .alpaca_client
-                .get(ALPACA_ACCOUNT_API_URL)
+                .get(&format!("{}/account", *ALPACA_API_URL))
                 .send()
                 .await?
                 .error_for_status()
diff --git a/src/types/alpaca/api/incoming/asset.rs b/src/types/alpaca/api/incoming/asset.rs
index e29be72..93177f9 100644
--- a/src/types/alpaca/api/incoming/asset.rs
+++ b/src/types/alpaca/api/incoming/asset.rs
@@ -1,6 +1,6 @@
 use super::position::Position;
 use crate::{
-    config::{Config, ALPACA_ASSET_API_URL},
+    config::{Config, ALPACA_API_URL},
     types::{
         self,
         alpaca::shared::asset::{Class, Exchange, Status},
@@ -57,7 +57,7 @@ pub async fn get_by_symbol(
             config.alpaca_rate_limit.until_ready().await;
             config
                 .alpaca_client
-                .get(&format!("{ALPACA_ASSET_API_URL}/{symbol}"))
+                .get(&format!("{}/assets/{}", *ALPACA_API_URL, symbol))
                 .send()
                 .await?
                 .error_for_status()
diff --git a/src/types/alpaca/api/incoming/clock.rs b/src/types/alpaca/api/incoming/clock.rs
index 0ff4176..33ec1ec 100644
--- a/src/types/alpaca/api/incoming/clock.rs
+++ b/src/types/alpaca/api/incoming/clock.rs
@@ -1,4 +1,4 @@
-use crate::config::{Config, ALPACA_CLOCK_API_URL};
+use crate::config::{Config, ALPACA_API_URL};
 use backoff::{future::retry_notify, ExponentialBackoff};
 use log::warn;
 use reqwest::Error;
@@ -27,7 +27,7 @@ pub async fn get(
             config.alpaca_rate_limit.until_ready().await;
             config
                 .alpaca_client
-                .get(ALPACA_CLOCK_API_URL)
+                .get(&format!("{}/clock", *ALPACA_API_URL))
                 .send()
                 .await?
                 .error_for_status()
diff --git a/src/types/alpaca/api/incoming/news.rs b/src/types/alpaca/api/incoming/news.rs
index 042672f..548237d 100644
--- a/src/types/alpaca/api/incoming/news.rs
+++ b/src/types/alpaca/api/incoming/news.rs
@@ -1,5 +1,5 @@
 use crate::{
-    config::{Config, ALPACA_NEWS_DATA_URL},
+    config::{Config, ALPACA_NEWS_DATA_API_URL},
     types::{
         self,
         alpaca::{api::outgoing, shared::news::normalize_html_content},
@@ -83,7 +83,7 @@ pub async fn get_historical(
             config.alpaca_rate_limit.until_ready().await;
             config
                 .alpaca_client
-                .get(ALPACA_NEWS_DATA_URL)
+                .get(ALPACA_NEWS_DATA_API_URL)
                 .query(query)
                 .send()
                 .await?
diff --git a/src/types/alpaca/api/incoming/order.rs b/src/types/alpaca/api/incoming/order.rs
index 1ee3d6d..65e2fd8 100644
--- a/src/types/alpaca/api/incoming/order.rs
+++ b/src/types/alpaca/api/incoming/order.rs
@@ -1,5 +1,5 @@
 use crate::{
-    config::{Config, ALPACA_ORDER_API_URL},
+    config::{Config, ALPACA_API_URL},
     types::alpaca::{api::outgoing, shared},
 };
 use backoff::{future::retry_notify, ExponentialBackoff};
@@ -20,7 +20,7 @@ pub async fn get(
             config.alpaca_rate_limit.until_ready().await;
             config
                 .alpaca_client
-                .get(ALPACA_ORDER_API_URL)
+                .get(&format!("{}/orders", *ALPACA_API_URL))
                 .query(query)
                 .send()
                 .await?
diff --git a/src/types/alpaca/api/incoming/position.rs b/src/types/alpaca/api/incoming/position.rs
index 07dc820..b18f6a6 100644
--- a/src/types/alpaca/api/incoming/position.rs
+++ b/src/types/alpaca/api/incoming/position.rs
@@ -1,5 +1,5 @@
 use crate::{
-    config::{Config, ALPACA_POSITION_API_URL},
+    config::{Config, ALPACA_API_URL},
     types::alpaca::shared::{
         self,
         asset::{Class, Exchange},
@@ -74,7 +74,7 @@ pub async fn get(
             config.alpaca_rate_limit.until_ready().await;
             config
                 .alpaca_client
-                .get(ALPACA_POSITION_API_URL)
+                .get(&format!("{}/positions", *ALPACA_API_URL))
                 .send()
                 .await?
                 .error_for_status()
@@ -108,7 +108,7 @@ pub async fn get_by_symbol(
             config.alpaca_rate_limit.until_ready().await;
             let response = config
                 .alpaca_client
-                .get(&format!("{ALPACA_POSITION_API_URL}/{symbol}"))
+                .get(&format!("{}/positions/{}", *ALPACA_API_URL, symbol))
                 .send()
                 .await?;
 
diff --git a/src/types/alpaca/shared/mod.rs b/src/types/alpaca/shared/mod.rs
index ccda22c..0415624 100644
--- a/src/types/alpaca/shared/mod.rs
+++ b/src/types/alpaca/shared/mod.rs
@@ -1,8 +1,10 @@
 pub mod asset;
+pub mod mode;
 pub mod news;
 pub mod order;
 pub mod sort;
 pub mod source;
 
+pub use mode::Mode;
 pub use sort::Sort;
 pub use source::Source;
diff --git a/src/types/alpaca/shared/mode.rs b/src/types/alpaca/shared/mode.rs
new file mode 100644
index 0000000..bb0d336
--- /dev/null
+++ b/src/types/alpaca/shared/mode.rs
@@ -0,0 +1,33 @@
+use serde::{Deserialize, Serialize};
+use std::{
+    fmt::{Display, Formatter},
+    str::FromStr,
+};
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum Mode {
+    Live,
+    Paper,
+}
+
+impl FromStr for Mode {
+    type Err = String;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s {
+            "live" => Ok(Self::Live),
+            "paper" => Ok(Self::Paper),
+            _ => Err(format!("Unknown mode: {s}")),
+        }
+    }
+}
+
+impl Display for Mode {
+    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), std::fmt::Error> {
+        match self {
+            Self::Live => write!(f, "live"),
+            Self::Paper => write!(f, "paper"),
+        }
+    }
+}