diff --git a/Cargo.toml b/Cargo.toml
index 74ea7e09..920ee81e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,3 +10,4 @@ url = "1.6.0"
 serde = "1.0.27"
 serde_derive = "1.0.27"
 serde_json = "1.0.9"
+serde_plain = "0.2.0"
diff --git a/src/lib.rs b/src/lib.rs
index 25ff5bae..4a3f4938 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -9,6 +9,7 @@ extern crate serde;
 #[macro_use]
 extern crate serde_derive;
 extern crate serde_json;
+extern crate serde_plain;
 extern crate url;
 
 #[macro_use]
@@ -17,7 +18,9 @@ mod macros;
 mod auth;
 mod dsn;
 mod project_id;
+mod protocol;
 
 pub use auth::*;
 pub use dsn::*;
 pub use project_id::*;
+pub use protocol::*;
diff --git a/src/protocol.rs b/src/protocol.rs
new file mode 100644
index 00000000..4219b9ae
--- /dev/null
+++ b/src/protocol.rs
@@ -0,0 +1,148 @@
+use std::collections::HashMap;
+
+use serde_json::Value;
+
+/// Represents a message.
+#[derive(Serialize, Deserialize, Default, Clone, Debug)]
+pub struct Message {
+    pub message: String,
+    #[serde(skip_serializing_if="Vec::is_empty")]
+    pub params: Vec<String>,
+}
+
+/// Represents a frame.
+#[derive(Serialize, Deserialize, Default, Clone, Debug)]
+pub struct Frame {
+    pub filename: String,
+    pub abs_path: Option<String>,
+    pub function: String,
+    pub lineno: Option<u32>,
+    pub context_line: Option<String>,
+    pub pre_context: Option<Vec<String>>,
+    pub post_context: Option<Vec<String>>,
+}
+
+/// Represents a stacktrace.
+#[derive(Serialize, Deserialize, Debug, Default, Clone)]
+pub struct Stacktrace {
+    pub frames: Vec<Frame>,
+}
+
+/// Represents a list of exceptions.
+#[derive(Serialize, Deserialize, Default, Clone, Debug)]
+pub struct Exception {
+    pub values: Vec<SingleException>,
+}
+
+/// Represents a single exception
+#[derive(Serialize, Deserialize, Debug, Default, Clone)]
+pub struct SingleException {
+    #[serde(rename="type")]
+    pub ty: String,
+    pub value: String,
+    pub stacktrace: Option<Stacktrace>,
+}
+
+/// Represents a single breadcrumb
+#[derive(Serialize, Deserialize, Debug, Default, Clone)]
+pub struct Breadcrumb {
+    pub timestamp: f64,
+    #[serde(rename="type")]
+    pub ty: String,
+    pub message: String,
+    pub category: String,
+}
+
+/// Represents a full event for Sentry.
+#[derive(Serialize, Deserialize, Debug, Default, Clone)]
+pub struct Event {
+    pub tags: HashMap<String, String>,
+    pub extra: HashMap<String, Value>,
+    pub level: String,
+    #[serde(skip_serializing_if="Option::is_none")]
+    pub fingerprint: Option<Vec<String>>,
+    #[serde(skip_serializing_if="Option::is_none", rename="sentry.interfaces.Message")]
+    pub message: Option<Message>,
+    pub platform: String,
+    pub timestamp: f64,
+    #[serde(skip_serializing_if="Option::is_none")]
+    pub server_name: Option<String>,
+    #[serde(skip_serializing_if="Option::is_none")]
+    pub release: Option<String>,
+    #[serde(skip_serializing_if="Option::is_none")]
+    pub dist: Option<String>,
+    #[serde(skip_serializing_if="Option::is_none")]
+    pub environment: Option<String>,
+    #[serde(skip_serializing_if="HashMap::is_empty")]
+    pub user: HashMap<String, String>,
+    #[serde(skip_serializing_if="HashMap::is_empty")]
+    pub contexts: HashMap<String, HashMap<String, String>>,
+    #[serde(skip_serializing_if="Vec::is_empty")]
+    pub breadcrumbs: Vec<Breadcrumb>,
+    pub exception: Option<Exception>,
+}
+
+/// Holds a single contextual item.
+#[derive(Debug, Default, Clone)]
+pub struct Context {
+    data: ContextData,
+    rest: HashMap<String, Value>,
+}
+
+#[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq, Hash)]
+#[serde(rename_all="lowercase")]
+pub enum Orientation {
+    Portrait,
+    Landscape,
+}
+
+#[derive(Debug, Clone)]
+pub enum ContextData {
+    Default,
+    Device {
+        name: Option<String>,
+        family: Option<String>,
+        model: Option<String>,
+        model_id: Option<String>,
+        arch: Option<String>,
+        battery_level: Option<f32>, 
+        orientation: Option<Orientation>,
+    },
+    Os {
+        name: Option<String>,
+        version: Option<String>,
+        build: Option<String>,
+        kernel_version: Option<String>,
+        rooted: Option<bool>,
+    },
+    Runtime {
+        name: Option<String>,
+        version: Option<String>,
+    }
+}
+
+impl Default for ContextData {
+    fn default() -> ContextData {
+        ContextData::Default
+    }
+}
+
+impl ContextData {
+    pub fn get_type(&self) -> &str {
+        match *self {
+            ContextData::Default => "default",
+            ContextData::Device { .. } => "device",
+            ContextData::Os { .. } => "os",
+            ContextData::Runtime { .. } => "runtime",
+        }
+    }
+}
+
+impl From<ContextData> for Context {
+    fn from(data: ContextData) -> Context {
+        Context {
+            data: data,
+            rest: HashMap::new(),
+        }
+    }
+}