diff --git a/src/main.rs b/src/main.rs
index 5bfba0b..4d2538d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -42,7 +42,9 @@ fn main() {
     let api = GetInfo2Builder::new()
         .access_key(access_key.clone())
         .finalize();
-    println!("{}", api.exec().unwrap());
+    for (coin, amount) in api.exec().unwrap().funds.iter() {
+        println!("coin: {} amount: {}", coin, amount);
+    }
 
     let api = TradeBuilder::new()
         .access_key(access_key.clone())
@@ -51,11 +53,20 @@ fn main() {
         .price(1.0)
         .amount(0.1)
         .finalize();
-    match api.exec() {
-        Ok(res) => {
-            println!("{}", res);
-            let json: Value = serde_json::from_str(res.as_str()).unwrap();
-            let order_id = json["return"]["order_id"].as_u64().unwrap();
+    match api.exec()
+        .and_then(|res| {
+            println!(
+                "received: {}, remains: {}, order_id: {}",
+                res.received,
+                res.remains,
+                res.order_id
+            );
+            if res.order_id == 0 {
+                panic!("Complete trade.");
+            }
+            Ok(res.order_id)
+        })
+        .and_then(|order_id| {
             let api = CancelOrderBuilder::new()
                 .access_key(access_key.clone())
                 .order_id(order_id)
@@ -63,14 +74,29 @@ fn main() {
                 .finalize();
             let wait_time = time::Duration::from_secs(5);
             thread::sleep(wait_time);
-            println!("{}", api.exec().unwrap());
-        }
-        _ => return,
+            api.exec()
+        })
+        .and_then(|res| {
+            println!("Cancel order_id: {}", res.order_id);
+            Ok(())
+        }) {
+
+        Ok(_) => println!("Complete trade and cancel"),
+        Err(e) => println!("Error: {}", e),
     }
 
     let api = ActiveOrdersBuilder::new()
         .access_key(access_key.clone())
         .currency_pair(Some("zaif_jpy".to_string()))
         .finalize();
-    println!("{}", api.exec().unwrap());
+    for (order_id, order) in api.exec().unwrap().iter() {
+        println!(
+            "order_id: {}, currency_pair: {}, action: {}, amount: {}, price: {}",
+            order_id,
+            order.currency_pair,
+            order.action,
+            order.amount,
+            order.price
+        );
+    }
 }
diff --git a/src/trade_api/active_orders.rs b/src/trade_api/active_orders.rs
index e21ecd5..49f462d 100644
--- a/src/trade_api/active_orders.rs
+++ b/src/trade_api/active_orders.rs
@@ -1,8 +1,10 @@
-extern crate reqwest;
+extern crate serde;
+extern crate serde_json;
 
 use std::collections::HashMap;
 
-use core::*;
+use trade_api::TradeApi;
+use core::AccessKey;
 
 builder!(ActiveOrdersBuilder => ActiveOrders {
     access_key: AccessKey = AccessKey::new("", ""),
@@ -10,24 +12,36 @@ builder!(ActiveOrdersBuilder => ActiveOrders {
 });
 
 impl ActiveOrders {
-    pub fn exec(&self) -> reqwest::Result<String> {
-        let param: &mut HashMap<String, String> = &mut HashMap::new();
-        param.insert("method".to_string(), "active_orders".to_string());
+    pub fn exec(&self) -> serde_json::Result<HashMap<u64, ActiveOrdersResponse>> {
+        serde_json::from_value(<Self as TradeApi>::exec(&self)?)
+    }
+}
+
+impl TradeApi for ActiveOrders {
+    fn method(&self) -> &str {
+        "active_orders"
+    }
+    fn parameters(&self) -> HashMap<String, String> {
+        let mut param = HashMap::new();
         if let Some(ref currency_pair) = self.currency_pair {
             param.insert(
                 "currency_pair".to_string(),
                 format!("{}", currency_pair.clone()),
             );
         }
-
-        let api = ApiBuilder::new()
-            .access_key(self.access_key.clone())
-            .uri("https://api.zaif.jp/tapi")
-            .method(Method::Post)
-            .param(param.clone())
-            .finalize();
-
-        api.exec()
+        param
+    }
+    fn access_key(&self) -> &AccessKey {
+        &self.access_key
     }
 }
 
+#[derive(Deserialize)]
+pub struct ActiveOrdersResponse {
+    pub currency_pair: String,
+    pub action: String,
+    pub amount: f64,
+    pub price: f64,
+    pub timestamp: String,
+    pub comment: String,
+}
diff --git a/src/trade_api/cancel_order.rs b/src/trade_api/cancel_order.rs
index 95b7643..79fbb01 100644
--- a/src/trade_api/cancel_order.rs
+++ b/src/trade_api/cancel_order.rs
@@ -1,8 +1,10 @@
-extern crate reqwest;
+extern crate serde;
+extern crate serde_json;
 
 use std::collections::HashMap;
 
-use core::*;
+use trade_api::TradeApi;
+use core::AccessKey;
 
 builder!(CancelOrderBuilder => CancelOrder {
     access_key: AccessKey = AccessKey::new("", ""),
@@ -11,9 +13,17 @@ builder!(CancelOrderBuilder => CancelOrder {
 });
 
 impl CancelOrder {
-    pub fn exec(&self) -> reqwest::Result<String> {
-        let param: &mut HashMap<String, String> = &mut HashMap::new();
-        param.insert("method".to_string(), "cancel_order".to_string());
+    pub fn exec(&self) -> serde_json::Result<CancelOrderResponse> {
+        serde_json::from_value(<Self as TradeApi>::exec(&self)?)
+    }
+}
+
+impl TradeApi for CancelOrder {
+    fn method(&self) -> &str {
+        "cancel_order"
+    }
+    fn parameters(&self) -> HashMap<String, String> {
+        let mut param = HashMap::new();
         param.insert("order_id".to_string(), format!("{}", self.order_id));
         if let Some(ref currency_pair) = self.currency_pair {
             param.insert(
@@ -21,15 +31,15 @@ impl CancelOrder {
                 format!("{}", currency_pair.clone()),
             );
         }
-
-        let api = ApiBuilder::new()
-            .access_key(self.access_key.clone())
-            .uri("https://api.zaif.jp/tapi")
-            .method(Method::Post)
-            .param(param.clone())
-            .finalize();
-
-        api.exec()
+        param
+    }
+    fn access_key(&self) -> &AccessKey {
+        &self.access_key
     }
 }
 
+#[derive(Deserialize)]
+pub struct CancelOrderResponse {
+    pub order_id: u64,
+    pub funds: HashMap<String, f64>,
+}
diff --git a/src/trade_api/get_info2.rs b/src/trade_api/get_info2.rs
index 0d09c29..b327b08 100644
--- a/src/trade_api/get_info2.rs
+++ b/src/trade_api/get_info2.rs
@@ -1,29 +1,38 @@
-extern crate reqwest;
+extern crate serde;
+extern crate serde_json;
 
 use std::collections::HashMap;
 
-use core::*;
+use trade_api::TradeApi;
+use core::AccessKey;
 
 builder!(GetInfo2Builder => GetInfo2 {
     access_key: AccessKey = AccessKey::new("", "")
 });
 
 impl GetInfo2 {
-    pub fn new(access_key: AccessKey) -> GetInfo2 {
-        GetInfo2 { access_key: access_key }
+    pub fn exec(&self) -> serde_json::Result<GetInfo2Response> {
+        serde_json::from_value(<Self as TradeApi>::exec(&self)?)
     }
-    pub fn exec(&self) -> reqwest::Result<String> {
-        let param: &mut HashMap<String, String> = &mut HashMap::new();
-        param.insert("method".to_string(), "get_info2".to_string());
-
-        let api = ApiBuilder::new()
-            .access_key(self.access_key.clone())
-            .uri("https://api.zaif.jp/tapi")
-            .method(Method::Post)
-            .param(param.clone())
-            .finalize();
+}
 
-        api.exec()
+impl TradeApi for GetInfo2 {
+    fn method(&self) -> &str {
+        "get_info2"
+    }
+    fn parameters(&self) -> HashMap<String, String> {
+        HashMap::new()
+    }
+    fn access_key(&self) -> &AccessKey {
+        &self.access_key
     }
 }
 
+#[derive(Deserialize)]
+pub struct GetInfo2Response {
+    pub funds: HashMap<String, f64>,
+    pub deposit: HashMap<String, f64>,
+    pub rights: HashMap<String, i64>,
+    pub open_orders: i64,
+    pub server_time: i64,
+}
diff --git a/src/trade_api/mod.rs b/src/trade_api/mod.rs
index 73d1939..23d0777 100644
--- a/src/trade_api/mod.rs
+++ b/src/trade_api/mod.rs
@@ -1,3 +1,11 @@
+extern crate reqwest;
+extern crate serde_json;
+
+use std::collections::HashMap;
+use self::serde_json::Value;
+
+use core::*;
+
 pub use self::get_info2::*;
 pub use self::trade::*;
 pub use self::active_orders::*;
@@ -7,3 +15,31 @@ mod get_info2;
 mod trade;
 mod active_orders;
 mod cancel_order;
+
+trait TradeApi {
+    fn method(&self) -> &str;
+    fn parameters(&self) -> HashMap<String, String>;
+    fn access_key(&self) -> &AccessKey;
+
+    fn exec(&self) -> serde_json::Result<Value> {
+        let mut param = self.parameters().clone();
+        param.insert("method".to_string(), self.method().to_string());
+
+        let api = ApiBuilder::new()
+            .access_key(self.access_key().clone())
+            .uri("https://api.zaif.jp/tapi")
+            .method(Method::Post)
+            .param(param)
+            .finalize();
+
+        let res = match api.exec() {
+            Ok(res) => res,
+            Err(e) => panic!("reqwest Error: {}", e),
+        };
+        let result: Value = serde_json::from_str(res.as_str())?;
+        if result["success"].as_i64().unwrap() != 1 {
+            panic!("error: {}", result["error"]);
+        }
+        Ok(result["return"].clone())
+    }
+}
diff --git a/src/trade_api/trade.rs b/src/trade_api/trade.rs
index f32ab38..eab81b1 100644
--- a/src/trade_api/trade.rs
+++ b/src/trade_api/trade.rs
@@ -1,8 +1,10 @@
-extern crate reqwest;
+extern crate serde;
+extern crate serde_json;
 
 use std::collections::HashMap;
 
-use core::*;
+use trade_api::TradeApi;
+use core::AccessKey;
 
 #[derive(Copy, Clone)]
 pub enum TradeAction {
@@ -31,9 +33,17 @@ builder!(TradeBuilder => Trade {
 });
 
 impl Trade {
-    pub fn exec(&self) -> reqwest::Result<String> {
-        let param: &mut HashMap<String, String> = &mut HashMap::new();
-        param.insert("method".to_string(), "trade".to_string());
+    pub fn exec(&self) -> serde_json::Result<TradeResponse> {
+        serde_json::from_value(<Self as TradeApi>::exec(&self)?)
+    }
+}
+
+impl TradeApi for Trade {
+    fn method(&self) -> &str {
+        "trade"
+    }
+    fn parameters(&self) -> HashMap<String, String> {
+        let mut param = HashMap::new();
         param.insert("currency_pair".to_string(), self.currency_pair.clone());
         param.insert("action".to_string(), self.action.param_string());
         param.insert("price".to_string(), format!("{}", self.price));
@@ -44,15 +54,17 @@ impl Trade {
         if let Some(ref comment) = self.comment {
             param.insert("comment".to_string(), format!("{}", comment.clone()));
         }
-
-        let api = ApiBuilder::new()
-            .access_key(self.access_key.clone())
-            .uri("https://api.zaif.jp/tapi")
-            .method(Method::Post)
-            .param(param.clone())
-            .finalize();
-
-        api.exec()
+        param
+    }
+    fn access_key(&self) -> &AccessKey {
+        &self.access_key
     }
 }
 
+#[derive(Deserialize)]
+pub struct TradeResponse {
+    pub received: f64,
+    pub remains: f64,
+    pub order_id: u64,
+    pub funds: HashMap<String, f64>,
+}