diff --git a/src/v2_5/bid.rs b/src/v2_5/bid.rs
new file mode 100644
index 0000000..44e7866
--- /dev/null
+++ b/src/v2_5/bid.rs
@@ -0,0 +1,58 @@
+use super::category::Category;
+use serde_utils;
+
+#[derive(Serialize, Deserialize, Debug)]
+pub struct Bid {
+    pub id: String,
+    #[serde(rename = "impid")]
+    pub imp_id: String,
+    pub price: f64,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub nurl: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub burl: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub lurl: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub adm: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub adid: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub adomain: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub bundle: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub iurl: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub cid: Option<String>,
+    #[serde(rename = "crid", skip_serializing_if = "Option::is_none")]
+    pub cr_id: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub tactic: Option<String>,
+    #[serde(skip_serializing_if = "Vec::is_empty")]
+    pub cat: Vec<Category>,
+    #[serde(skip_serializing_if = "Vec::is_empty")]
+    pub attr: Vec<u32>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub api: Option<u32>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub protocol: Option<u32>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub qagmediarating: Option<u32>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub language: Option<String>,
+    #[serde(rename = "dealid", skip_serializing_if = "Option::is_none")]
+    pub deal_id: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub w: Option<u64>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub h: Option<u64>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub wratio: Option<u64>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub hratio: Option<u64>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub exp: Option<u64>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub ext: Option<serde_utils::Ext>,
+}
diff --git a/src/v2_5/mod.rs b/src/v2_5/mod.rs
index 360f4eb..b6ad66a 100644
--- a/src/v2_5/mod.rs
+++ b/src/v2_5/mod.rs
@@ -11,6 +11,7 @@ mod app;
 mod audio;
 mod banner;
 mod banner_ad_type;
+mod bid;
 mod bid_request;
 mod bid_response;
 mod category;
@@ -34,6 +35,7 @@ pub use self::app::*;
 pub use self::audio::*;
 pub use self::banner::*;
 pub use self::banner_ad_type::*;
+pub use self::bid::*;
 pub use self::bid_request::*;
 pub use self::bid_response::*;
 pub use self::category::*;
diff --git a/src/v2_5/seat_bid.rs b/src/v2_5/seat_bid.rs
index 0b6f1c6..4f63450 100644
--- a/src/v2_5/seat_bid.rs
+++ b/src/v2_5/seat_bid.rs
@@ -1,3 +1,13 @@
+use serde_utils;
+use super::bid::Bid;
+
 #[derive(Serialize, Deserialize, Debug)]
 pub struct SeatBid {
+    pub bid: Vec<Bid>, // todo: require 1+ bid somehow
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub seat: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub group: Option<u32>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub ext: Option<serde_utils::Ext>,
 }