diff --git a/xmtp_content_types/src/lib.rs b/xmtp_content_types/src/lib.rs
index b0c1b609e..95042313b 100644
--- a/xmtp_content_types/src/lib.rs
+++ b/xmtp_content_types/src/lib.rs
@@ -1,6 +1,11 @@
 pub mod group_updated;
 pub mod membership_change;
+pub mod reaction;
+pub mod reply;
+pub mod read_receipt;
+pub mod remote_attachment;
 pub mod text;
+pub mod transaction_reference;
 
 use diesel::{
     backend::Backend,
@@ -38,11 +43,11 @@ impl ContentType {
             text::TextCodec::TYPE_ID => Self::Text,
             membership_change::GroupMembershipChangeCodec::TYPE_ID => Self::GroupMembershipChange,
             group_updated::GroupUpdatedCodec::TYPE_ID => Self::GroupUpdated,
-            "reaction" => Self::Reaction,
-            "reply" => Self::Reply,
-            "read_receipt" => Self::ReadReceipt,
-            "remote_attachment" => Self::RemoteAttachment,
-            "transaction_reference" => Self::TransactionReference,
+            reaction::ReactionCodec::TYPE_ID => Self::Reaction,
+            reply::ReplyCodec::TYPE_ID => Self::Reply,
+            read_receipt::ReadReceiptCodec::TYPE_ID => Self::ReadReceipt,
+            remote_attachment::RemoteAttachmentCodec::TYPE_ID => Self::RemoteAttachment,
+            transaction_reference::TransactionReferenceCodec::TYPE_ID => Self::TransactionReference,
             _ => Self::Unknown,
         }
     }
@@ -53,11 +58,11 @@ impl ContentType {
             Self::Text => text::TextCodec::TYPE_ID,
             Self::GroupMembershipChange => membership_change::GroupMembershipChangeCodec::TYPE_ID,
             Self::GroupUpdated => group_updated::GroupUpdatedCodec::TYPE_ID,
-            Self::Reaction => "reaction",
-            Self::Reply => "reply",
-            Self::ReadReceipt => "read_receipt",
-            Self::RemoteAttachment => "remote_attachment",
-            Self::TransactionReference => "transaction_reference",
+            Self::Reaction => reaction::ReactionCodec::TYPE_ID,
+            Self::Reply => reply::ReplyCodec::TYPE_ID,
+            Self::ReadReceipt => read_receipt::ReadReceiptCodec::TYPE_ID,
+            Self::RemoteAttachment => remote_attachment::RemoteAttachmentCodec::TYPE_ID,
+            Self::TransactionReference => transaction_reference::TransactionReferenceCodec::TYPE_ID,
         }
     }
 }
diff --git a/xmtp_content_types/src/reaction.rs b/xmtp_content_types/src/reaction.rs
new file mode 100644
index 000000000..50a89ebce
--- /dev/null
+++ b/xmtp_content_types/src/reaction.rs
@@ -0,0 +1,6 @@
+pub struct ReactionCodec {}
+
+impl ReactionCodec {
+    const AUTHORITY_ID: &'static str = "xmtp.org";
+    pub const TYPE_ID: &'static str = "reaction";
+}
diff --git a/xmtp_content_types/src/read_receipt.rs b/xmtp_content_types/src/read_receipt.rs
new file mode 100644
index 000000000..a81a2b7ad
--- /dev/null
+++ b/xmtp_content_types/src/read_receipt.rs
@@ -0,0 +1,6 @@
+pub struct ReadReceiptCodec {}
+
+impl ReadReceiptCodec {
+    const AUTHORITY_ID: &'static str = "xmtp.org";
+    pub const TYPE_ID: &'static str = "read_receipt";
+}
diff --git a/xmtp_content_types/src/remote_attachment.rs b/xmtp_content_types/src/remote_attachment.rs
new file mode 100644
index 000000000..77680aefe
--- /dev/null
+++ b/xmtp_content_types/src/remote_attachment.rs
@@ -0,0 +1,6 @@
+pub struct RemoteAttachmentCodec {}
+
+impl RemoteAttachmentCodec {
+    const AUTHORITY_ID: &'static str = "xmtp.org";
+    pub const TYPE_ID: &'static str = "remote_attachment";
+}
diff --git a/xmtp_content_types/src/reply.rs b/xmtp_content_types/src/reply.rs
new file mode 100644
index 000000000..6f8ba32f3
--- /dev/null
+++ b/xmtp_content_types/src/reply.rs
@@ -0,0 +1,6 @@
+pub struct ReplyCodec {}
+
+impl ReplyCodec {
+    const AUTHORITY_ID: &'static str = "xmtp.org";
+    pub const TYPE_ID: &'static str = "reply";
+}
diff --git a/xmtp_content_types/src/transaction_reference.rs b/xmtp_content_types/src/transaction_reference.rs
new file mode 100644
index 000000000..c7060dc88
--- /dev/null
+++ b/xmtp_content_types/src/transaction_reference.rs
@@ -0,0 +1,6 @@
+pub struct TransactionReferenceCodec {}
+
+impl TransactionReferenceCodec {
+    const AUTHORITY_ID: &'static str = "xmtp.org";
+    pub const TYPE_ID: &'static str = "transaction_reference";
+}