diff --git a/Cargo.toml b/Cargo.toml
index ca29e539..5cc90888 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,5 +1,5 @@
 [package]
-authors = ["Jimmy Cuadra <jimmy@jimmycuadra.com>"]
+authors = ["Jonas Platte <jplatte+git@posteo.de>"]
 categories = ["api-bindings", "web-programming"]
 description = "Types for the endpoints in the Matrix server-server API."
 documentation = "https://docs.rs/ruma-federation-api"
@@ -13,3 +13,8 @@ repository = "https://github.com/ruma/ruma-federation-api"
 version = "0.1.0"
 
 [dependencies]
+js_int = "0.1.3"
+ruma-events = "0.18.0"
+ruma-identifiers = "0.14.1"
+serde = { version = "1.0.105", features = ["derive"] }
+serde_json = "1.0.50"
diff --git a/src/lib.rs b/src/lib.rs
index 8b137891..b2189a10 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1 +1,40 @@
+// TODO
+//!#[warn(missing_docs)]
 
+use std::collections::HashMap;
+
+use js_int::UInt;
+use ruma_events::EventType;
+use ruma_identifiers::{EventId, RoomId, UserId};
+use serde::{Deserialize, Serialize};
+use serde_json::Value as JsonValue;
+
+#[derive(Deserialize, Serialize)]
+pub struct RoomV3Pdu {
+    pub room_id: RoomId,
+    pub sender: UserId,
+    pub origin: String,
+    pub origin_server_ts: UInt,
+
+    // TODO: Replace with event content collection from ruma-events once that exists
+    #[serde(rename = "type")]
+    pub kind: EventType,
+    pub content: JsonValue,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub state_key: Option<String>,
+    pub prev_events: Vec<EventId>,
+    pub depth: UInt,
+    pub auth_events: Vec<EventId>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub redacts: Option<EventId>,
+    #[serde(default, skip_serializing_if = "serde_json::Map::is_empty")]
+    pub unsigned: serde_json::Map<String, JsonValue>,
+    pub hashes: EventHash,
+    pub signatures: HashMap<String, HashMap<String, String>>,
+}
+
+#[derive(Deserialize, Serialize)]
+pub struct EventHash {
+    pub sha256: String,
+}