diff --git a/Cargo.toml b/Cargo.toml
index 1c9b5b6..23e4cc6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,8 +27,8 @@ members = [
 	"p2p/p2p-core",
 	"p2p/bucket",
 	"p2p/dandelion-tower",
-	"p2p/address-book",
 	"p2p/async-buffer",
+	"p2p/address-book",
 
 	# Storage
 	"storage/blockchain",
diff --git a/rpc/types/src/defaults.rs b/rpc/types/src/defaults.rs
index 6bf1aa4..9457793 100644
--- a/rpc/types/src/defaults.rs
+++ b/rpc/types/src/defaults.rs
@@ -5,7 +5,7 @@
 //! has a [`crate::json::GetBlockRequest::height`]
 //! field and a [`crate::json::GetBlockRequest::hash`]
 //! field, when the RPC interface reads JSON without
-//! `height`, it will use [`default_height`] to fill that in.
+//! `height`, it will use [`default`] to fill that in.
 
 //---------------------------------------------------------------------------------------------------- Import
 
@@ -16,12 +16,6 @@ pub(crate) const fn default_true() -> bool {
     true
 }
 
-/// Default `0` value used in request/response types.
-#[inline]
-pub(crate) fn default_zero<T: From<u8>>() -> T {
-    T::from(0)
-}
-
 /// Default `1` value used in request/response types.
 #[inline]
 pub(crate) fn default_one<T: From<u8>>() -> T {
@@ -36,16 +30,4 @@ pub(crate) fn default<T: Default>() -> T {
 
 //---------------------------------------------------------------------------------------------------- Tests
 #[cfg(test)]
-mod test {
-    use super::*;
-
-    /// Tests that [`default_zero`] returns `0` on all unsigned numbers.
-    #[test]
-    fn zero() {
-        assert_eq!(default_zero::<usize>(), 0);
-        assert_eq!(default_zero::<u64>(), 0);
-        assert_eq!(default_zero::<u32>(), 0);
-        assert_eq!(default_zero::<u16>(), 0);
-        assert_eq!(default_zero::<u8>(), 0);
-    }
-}
+mod test {}
diff --git a/rpc/types/src/json.rs b/rpc/types/src/json.rs
index 39165b1..e304a67 100644
--- a/rpc/types/src/json.rs
+++ b/rpc/types/src/json.rs
@@ -78,15 +78,15 @@ define_request_and_response! {
         //
         // This is a HACK since `serde`'s default attribute only takes in
         // string literals and macros (stringify) within attributes do not work.
-        extra_nonce: String,
-        prev_block: String,
+        extra_nonce: String = default::<String>(), "default",
+        prev_block: String = default::<String>(), "default",
 
         // Another optional expression:
         // This indicates to the macro to (de)serialize
         // this field as another type in epee.
         //
         // See `cuprate_epee_encoding::epee_object` for info.
-        reserve_size: u64,
+        reserve_size: u64 /* as Type */,
 
         wallet_address: String,
     },
@@ -197,7 +197,7 @@ define_request_and_response! {
 
     Request {
         amount_of_blocks: u64,
-        prev_block: String,
+        prev_block: String = default::<String>(), "default",
         starting_nonce: u32,
         wallet_address: String,
     },
@@ -217,7 +217,7 @@ define_request_and_response! {
 
     #[derive(Copy)]
     Request {
-        fill_pow_hash: bool,
+        fill_pow_hash: bool = default::<bool>(), "default",
     },
 
     AccessResponseBase {
@@ -232,9 +232,9 @@ define_request_and_response! {
     GetBlockHeaderByHash,
 
     Request {
-        hash: Hex<32>,
-        hashes: Vec<Hex<32>>,
-        fill_pow_hash: bool,
+        hash: Hex<32> = default::<Hex<32>>(), "default",
+        hashes: Vec<Hex<32>> = default::<Vec<Hex<32>>>(), "default",
+        fill_pow_hash: bool = default::<bool>(), "default",
     },
 
     AccessResponseBase {
@@ -253,7 +253,7 @@ define_request_and_response! {
     #[derive(Copy)]
     Request {
         height: u64,
-        fill_pow_hash: bool,
+        fill_pow_hash: bool = default::<bool>(), "default",
     },
 
     AccessResponseBase {
@@ -272,7 +272,7 @@ define_request_and_response! {
     Request {
         start_height: u64,
         end_height: u64,
-        fill_pow_hash: bool,
+        fill_pow_hash: bool = default::<bool>(), "default",
     },
 
     AccessResponseBase {
@@ -290,9 +290,9 @@ define_request_and_response! {
         // `monerod` has both `hash` and `height` fields.
         // In the RPC handler, if `hash.is_empty()`, it will use it, else, it uses `height`.
         // <https://github.com/monero-project/monero/blob/cc73fe71162d564ffda8e549b79a350bca53c454/src/rpc/core_rpc_server.cpp#L2674>
-        hash: String,
-        height: u64,
-        fill_pow_hash: bool,
+        hash: String = default::<String>(), "default",
+        height: u64 = default::<u64>(), "default",
+        fill_pow_hash: bool = default::<bool>(), "default",
     },
 
     AccessResponseBase {
@@ -445,7 +445,7 @@ define_request_and_response! {
     FlushTransactionPool (restricted),
 
     Request {
-        txids: Vec<Hex<32>>,
+        txids: Vec<Hex<32>> = default::<Vec<Hex<32>>>(), "default",
     },
 
     #[repr(transparent)]
@@ -461,11 +461,11 @@ define_request_and_response! {
     GetOutputHistogram,
 
     Request {
-        amounts: Vec<u64>,
-        min_count: u64,
-        max_count: u64,
-        unlocked: bool,
-        recent_cutoff: u64,
+        amounts: Vec<u64> = default::<Vec<u64>>(), "default",
+        min_count: u64 = default::<u64>(), "default",
+        max_count: u64 = default::<u64>(), "default",
+        unlocked: bool = default::<bool>(), "default",
+        recent_cutoff: u64 = default::<u64>(), "default",
     },
 
     AccessResponseBase {
@@ -520,7 +520,7 @@ define_request_and_response! {
     GetFeeEstimate,
 
     Request {
-        grace_blocks: u64,
+        grace_blocks: u64 = default::<u64>(), "default",
     },
 
     AccessResponseBase {
@@ -550,7 +550,7 @@ define_request_and_response! {
     RelayTx (restricted),
 
     Request {
-        txids: Vec<Hex<32>>,
+        txids: Vec<Hex<32>> = default::<Vec<Hex<32>>>(), "default",
     },
 
     #[repr(transparent)]
@@ -604,10 +604,10 @@ define_request_and_response! {
     Request {
         amounts: Vec<u64>,
         binary: bool = default_true(), "default_true",
-        compress: bool,
-        cumulative: bool,
-        from_height: u64,
-        to_height: u64,
+        compress: bool = default::<bool>(), "default",
+        cumulative: bool = default::<bool>(), "default",
+        from_height: u64 = default::<u64>(), "default",
+        to_height: u64 = default::<u64>(), "default",
     },
 
     AccessResponseBase {
@@ -643,7 +643,7 @@ define_request_and_response! {
 
     #[derive(Copy)]
     Request {
-        check: bool,
+        check: bool = default::<bool>(), "default",
     },
 
     ResponseBase {
diff --git a/rpc/types/src/macros.rs b/rpc/types/src/macros.rs
index 77ffe87..c815844 100644
--- a/rpc/types/src/macros.rs
+++ b/rpc/types/src/macros.rs
@@ -238,7 +238,6 @@ macro_rules! define_request {
     ) => {
         #[allow(dead_code, missing_docs, reason = "inside a macro")]
         #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
-        #[cfg_attr(feature = "serde", serde(default))] // TODO: link epee field not serializing oddity
         #[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
         $( #[$attr] )*
         pub struct $t {
@@ -292,6 +291,7 @@ macro_rules! define_response {
         }
     ) => {
         $( #[$attr] )*
+        #[cfg_attr(feature = "serde", serde(default))] // TODO: link epee field not serializing oddity
         pub struct $t {
             $(
                 $( #[$field_attr] )*
@@ -329,6 +329,7 @@ macro_rules! define_response {
         }
     ) => {
         $( #[$attr] )*
+        #[cfg_attr(feature = "serde", serde(default))] // TODO: link epee field not serializing oddity
         pub struct $t {
             #[cfg_attr(feature = "serde", serde(flatten))]
             pub base: $base,
diff --git a/rpc/types/src/other.rs b/rpc/types/src/other.rs
index 17e88c0..045665f 100644
--- a/rpc/types/src/other.rs
+++ b/rpc/types/src/other.rs
@@ -12,12 +12,12 @@ use cuprate_types::rpc::{OutKey, Peer, PublicNode, TxpoolStats};
 use crate::{
     base::{AccessResponseBase, ResponseBase},
     macros::define_request_and_response,
-    misc::{GetOutputsOut, KeyImageSpentStatus, SpentKeyImageInfo, Status, TxEntry, TxInfo},
+    misc::{GetOutputsOut, SpentKeyImageInfo, Status, TxEntry, TxInfo},
     RpcCallValue,
 };
 
 #[cfg(any(feature = "serde", feature = "epee"))]
-use crate::defaults::default_true;
+use crate::defaults::{default, default_true};
 
 //---------------------------------------------------------------------------------------------------- Definitions
 define_request_and_response! {
@@ -44,9 +44,9 @@ define_request_and_response! {
         // FIXME: this is documented as optional but it isn't serialized as an optional
         // but it is set _somewhere_ to false in `monerod`
         // <https://github.com/monero-project/monero/blob/cc73fe71162d564ffda8e549b79a350bca53c454/src/rpc/core_rpc_server_commands_defs.h#L382>
-        decode_as_json: bool,
-        prune: bool,
-        split: bool,
+        decode_as_json: bool = default::<bool>(), "default",
+        prune: bool = default::<bool>(), "default",
+        split: bool = default::<bool>(), "default",
     },
 
     AccessResponseBase {
@@ -83,7 +83,8 @@ define_request_and_response! {
     },
 
     AccessResponseBase {
-        spent_status: Vec<KeyImageSpentStatus>,
+        /// These [`u8`]s are [`crate::misc::KeyImageSpentStatus`].
+        spent_status: Vec<u8>,
     }
 }
 
@@ -96,7 +97,7 @@ define_request_and_response! {
 
     Request {
         tx_as_hex: String,
-        do_not_relay: bool,
+        do_not_relay: bool = default::<bool>(), "default",
         do_sanity_checks: bool = default_true(), "default_true",
     },
 
@@ -189,7 +190,7 @@ define_request_and_response! {
 
     Request {
         public_only: bool = default_true(), "default_true",
-        include_blocked: bool,
+        include_blocked: bool = default::<bool>(), "default",
     },
 
     ResponseBase {
@@ -236,7 +237,7 @@ define_request_and_response! {
     SetLogCategories (restricted),
 
     Request {
-        categories: String,
+        categories: String = default::<String>(), "default",
     },
 
     ResponseBase {
@@ -253,9 +254,9 @@ define_request_and_response! {
 
     Request {
         address: String,
-        username: String,
-        password: String,
-        proxy: String,
+        username: String = default::<String>(), "default",
+        password: String = default::<String>(), "default",
+        proxy: String = default::<String>(), "default",
     },
 
     Response {
@@ -325,8 +326,8 @@ define_request_and_response! {
     SetLimit (restricted),
 
     Request {
-        limit_down: i64,
-        limit_up: i64,
+        limit_down: i64 = default::<i64>(), "default",
+        limit_up: i64 = default::<i64>(), "default",
     },
 
     ResponseBase {
@@ -408,7 +409,7 @@ define_request_and_response! {
 
     Request {
         command: String,
-        path: String,
+        path: String = default::<String>(), "default",
     },
     ResponseBase {
         auto_uri: String,
@@ -458,9 +459,9 @@ define_request_and_response! {
     GetPublicNodes (restricted),
 
     Request {
-        gray: bool,
+        gray: bool = default::<bool>(), "default",
         white: bool = default_true(), "default_true",
-        include_blocked: bool,
+        include_blocked: bool = default::<bool>(), "default",
     },
 
     ResponseBase {
@@ -698,7 +699,7 @@ mod test {
 
     #[test]
     fn get_transactions_response() {
-        test_json::<GetTransactionsRequest>(other::GET_TRANSACTIONS_RESPONSE, None);
+        test_json::<GetTransactionsResponse>(other::GET_TRANSACTIONS_RESPONSE, None);
     }
 
     #[test]
@@ -737,7 +738,7 @@ mod test {
             other::IS_KEY_IMAGE_SPENT_RESPONSE,
             Some(IsKeyImageSpentResponse {
                 base: AccessResponseBase::OK,
-                spent_status: vec![KeyImageSpentStatus::SpentInBlockchain; 2],
+                spent_status: vec![1, 1],
             }),
         );
     }
diff --git a/types/hex/src/hex.rs b/types/hex/src/hex.rs
index f395f66..33bb416 100644
--- a/types/hex/src/hex.rs
+++ b/types/hex/src/hex.rs
@@ -19,6 +19,17 @@ use serde::{Deserialize, Deserializer, Serialize};
 ///
 /// let from_str = serde_json::from_str::<Hex<32>>(expected_json).unwrap();
 /// assert_eq!(hex_bytes, from_str);
+///
+/// //------
+///
+/// let vec = vec![hex_bytes; 2];
+/// let expected_json = r#"["0101010101010101010101010101010101010101010101010101010101010101","0101010101010101010101010101010101010101010101010101010101010101"]"#;
+///
+/// let to_string = serde_json::to_string(&vec).unwrap();
+/// assert_eq!(to_string, expected_json);
+///
+/// let from_str = serde_json::from_str::<Vec<Hex<32>>>(expected_json).unwrap();
+/// assert_eq!(vec, from_str);
 /// ```
 ///
 /// # Deserialization
@@ -30,6 +41,19 @@ use serde::{Deserialize, Deserializer, Serialize};
 #[repr(transparent)]
 pub struct Hex<const N: usize>(#[serde(with = "hex::serde")] pub [u8; N]);
 
+impl<const N: usize> Hex<N> {
+    /// Returns `true` if the inner array is zeroed.
+    ///
+    /// ```rust
+    /// # use cuprate_hex::Hex;
+    /// assert!(Hex([0; 32]).is_zeroed());
+    /// assert!(!Hex([1; 32]).is_zeroed());
+    /// ```
+    pub fn is_zeroed(&self) -> bool {
+        *self == Self([0; N])
+    }
+}
+
 impl<'de, const N: usize> Deserialize<'de> for Hex<N>
 where
     [u8; N]: FromHex,