diff --git a/rpc/monero-rpc-types/Cargo.toml b/rpc/monero-rpc-types/Cargo.toml
index f638a93..880c3c5 100644
--- a/rpc/monero-rpc-types/Cargo.toml
+++ b/rpc/monero-rpc-types/Cargo.toml
@@ -9,7 +9,7 @@ repository  = "https://github.com/Cuprate/cuprate/tree/main/rpc/monero-rpc-types
 keywords    = ["monero", "rpc", "types"]
 
 [features]
-default = ["dep:serde"]
+default = ["serde"]
 
 [dependencies]
 monero-serai = { workspace = true }
diff --git a/rpc/monero-rpc-types/src/json.rs b/rpc/monero-rpc-types/src/json.rs
index fd30727..5526925 100644
--- a/rpc/monero-rpc-types/src/json.rs
+++ b/rpc/monero-rpc-types/src/json.rs
@@ -1,8 +1,20 @@
 //! TODO
+//!
+//! <https://github.com/monero-project/monero/blob/cc73fe71162d564ffda8e549b79a350bca53c454/src/rpc/daemon_messages.h>.
 
 //---------------------------------------------------------------------------------------------------- Import
+use crate::macros::define_monero_rpc_type_struct;
 
 //---------------------------------------------------------------------------------------------------- TODO
+define_monero_rpc_type_struct! {
+    get_height,
+    daemon_messages.h => 81..=87,
+    GetHeight { height: 123 } => r#"{"height":123}"#,
+    GetHeight {
+        /// A block height.
+        height: u64,
+    }
+}
 
 //---------------------------------------------------------------------------------------------------- Tests
 #[cfg(test)]
diff --git a/rpc/monero-rpc-types/src/lib.rs b/rpc/monero-rpc-types/src/lib.rs
index da0d5d2..4c2094f 100644
--- a/rpc/monero-rpc-types/src/lib.rs
+++ b/rpc/monero-rpc-types/src/lib.rs
@@ -76,6 +76,9 @@
 	// FIXME: good lint but is less clear in most cases.
 	clippy::items_after_statements,
 
+	// TODO
+	rustdoc::bare_urls,
+
 	clippy::module_name_repetitions,
 	clippy::module_inception,
 	clippy::redundant_pub_crate,
diff --git a/rpc/monero-rpc-types/src/macros.rs b/rpc/monero-rpc-types/src/macros.rs
index e012259..3c8132f 100644
--- a/rpc/monero-rpc-types/src/macros.rs
+++ b/rpc/monero-rpc-types/src/macros.rs
@@ -2,22 +2,75 @@
 //!
 //! These generate repetitive documentation, tests, etc.
 
-//---------------------------------------------------------------------------------------------------- Documentation macros
+//---------------------------------------------------------------------------------------------------- Struct definition
 /// TODO
-macro_rules! serde_doc_test {
+macro_rules! define_monero_rpc_type_struct {
     (
-        $type:ty, // TODO
+        $monero_daemon_rpc_doc_link:ident, // TODO
+        $monero_code_filename:ident.$monero_code_filename_extension:ident => // TODO
+        $monero_code_line_start:literal..= // TODO
+        $monero_code_line_end:literal, // TODO
+        $type_literal:expr => // TODO
+        $type_as_json:literal, // TODO
+        $type_name:ident { // TODO
+            $(
+                $( #[$field_attr:meta] )* // TODO
+                $field:ident: $type:ty, // TODO
+            )*
+        }
     ) => {
-        #[doc = "TODO"]
+        ///
+        #[derive(Copy, Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
+        #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+        ///
+        // Documents the original Monero type and where it is located in `monero-project/monero`.
+        #[doc = concat!(
+            "",
+            "Definition: [`",
+            stringify!($monero_code_filename),
+            ".",
+            stringify!($monero_code_filename_extension),
+            " @ ",
+            stringify!($monero_code_line_start),
+            "..=",
+            stringify!($monero_code_line_end),
+            "`](",
+            "https://github.com/monero-project/monero/blob/cc73fe71162d564ffda8e549b79a350bca53c454/src/rpc/",
+            stringify!($monero_code_filename),
+            ".",
+            stringify!($monero_code_filename_extension),
+            "#L",
+            stringify!($monero_code_line_start),
+            "-L",
+            stringify!($monero_code_line_end),
+            "), documentation: [`",
+            stringify!($monero_daemon_rpc_doc_link),
+            "`](https://www.getmonero.org/resources/developer-guides/daemon-rpc.html",
+            "#",
+            stringify!($monero_daemon_rpc_doc_link),
+            ").",
+        )]
+        ///
+        // Doc-test that tests (de)serialization.
+        /// # `serde` example
+        /// ```rust
+        #[doc = "# use monero_rpc_types::{json::*, binary::*, data::*, mix::*};"]
+        #[doc = concat!("let t = ", stringify!($type_literal), ";")]
+        #[doc = "let string = serde_json::to_string(&t).unwrap();"]
+        #[doc = concat!("assert_eq!(string, ", stringify!($type_as_json), ");")]
+        #[doc = ""]
+        #[doc = "let t2 = serde_json::from_str(&string).unwrap();"]
+        #[doc = "assert_eq!(t, t2);"]
+        /// ```
+        // The type.
+        pub struct $type_name {
+            $(
+                $( #[$field_attr] )*
+                pub $field: $type,
+            )*
+        }
     };
 }
+pub(crate) use define_monero_rpc_type_struct;
 
-/// TODO
-macro_rules! monero_ref {
-    (
-        $monero_code_link:literal,    // TODO
-        $monero_rpc_doc_link:literal, // TODO
-    ) => {
-        #[doc = "TODO"]
-    };
-}
+//---------------------------------------------------------------------------------------------------- Documentation macros