diff --git a/.gitignore b/.gitignore
index 918d7befce..87c9d1f937 100644
--- a/.gitignore
+++ b/.gitignore
@@ -44,7 +44,7 @@ dump
 
 fuzzing-code-coverage
 
-*.wasm
+./*.wasm
 stats
 !uniond/vendor/**/*.wasm
 _
diff --git a/Cargo.lock b/Cargo.lock
index 91ca3aaaa6..0ce174412e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -12463,6 +12463,17 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "serde-wasm-bindgen"
+version = "0.6.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8302e169f0eddcc139c70f139d19d6467353af16f9fce27e8c30158036a1e16b"
+dependencies = [
+ "js-sys",
+ "serde",
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "serde_bytes"
 version = "0.11.19"
@@ -15388,12 +15399,15 @@ name = "ucs03-zkgm-packet"
 version = "0.0.0"
 dependencies = [
  "alloy-sol-types",
+ "embed-commit",
  "enumorph",
  "hex-literal 0.4.1",
  "serde",
+ "serde-wasm-bindgen",
  "serde_json",
  "ucs03-zkgm",
  "unionlabs-primitives",
+ "wasm-bindgen",
 ]
 
 [[package]]
diff --git a/cosmwasm/cosmwasm.nix b/cosmwasm/cosmwasm.nix
index 183f317c14..b6e1521349 100644
--- a/cosmwasm/cosmwasm.nix
+++ b/cosmwasm/cosmwasm.nix
@@ -1051,6 +1051,10 @@ _: {
       access-manager = crane.buildWasmContract "cosmwasm/access-manager" { };
       access-managed-example = crane.buildWasmContract "e2e/access-managed-example" { };
 
+      ucs03-zkgm-packet = crane.buildWasm "lib/ucs03-zkgm-packet" {
+        features = [ "serde" ];
+      };
+
       cw20-base = crane.buildWasmContract "cosmwasm/cw20-base" { };
 
       cw20-wrapped-tokenfactory = crane.buildWasmContract "cosmwasm/cw20-wrapped-tokenfactory" { };
@@ -1127,6 +1131,7 @@ _: {
             lst-staker
             access-managed-example
             proxy-account-factory
+            ucs03-zkgm-packet
             ;
           cosmwasm-scripts =
             {
diff --git a/flake.nix b/flake.nix
index e19c60e7e7..daba14267a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -555,6 +555,10 @@
                 yq
                 perl
               ])
+              ++ [
+                pkgsUnstable.wasm-bindgen-cli_0_2_100
+                pkgs.wasm-pack
+              ]
               ++ (with pkgsUnstable; [
                 bun
                 pnpm_10
@@ -569,6 +573,7 @@
                 nodePackages_latest."@tailwindcss/language-server"
                 nodePackages_latest.typescript-language-server
                 nodePackages_latest.vscode-langservers-extracted
+                binaryen
               ])
               ++ (with pkgs; [
                 wasm-tools
diff --git a/lib/ucs03-zkgm-packet/Cargo.toml b/lib/ucs03-zkgm-packet/Cargo.toml
index 4846e6ccd3..a8b795606c 100644
--- a/lib/ucs03-zkgm-packet/Cargo.toml
+++ b/lib/ucs03-zkgm-packet/Cargo.toml
@@ -11,13 +11,19 @@ repository   = { workspace = true }
 [lints]
 workspace = true
 
+[lib]
+crate-type = ["cdylib"]
+
 [dependencies]
 alloy-sol-types      = { workspace = true }
+embed-commit         = { workspace = true }
 enumorph             = { workspace = true }
 hex-literal          = { workspace = true }
 serde                = { workspace = true, optional = true, features = ["derive"] }
-ucs03-zkgm           = { workspace = true }
+serde-wasm-bindgen   = "0.6.5"
+ucs03-zkgm           = { workspace = true, features = ["library"] }
 unionlabs-primitives = { workspace = true }
+wasm-bindgen         = "=0.2.100"
 
 [features]
 default = ["serde"]
diff --git a/lib/ucs03-zkgm-packet/src/lib.rs b/lib/ucs03-zkgm-packet/src/lib.rs
index 1f92044635..80f125861f 100644
--- a/lib/ucs03-zkgm-packet/src/lib.rs
+++ b/lib/ucs03-zkgm-packet/src/lib.rs
@@ -3,6 +3,7 @@ use std::error::Error;
 use alloy_sol_types::{SolValue, abi::TokenSeq};
 use ucs03_zkgm::com::{TAG_ACK_FAILURE, TAG_ACK_SUCCESS};
 use unionlabs_primitives::{Bytes, H256, U256};
+use wasm_bindgen::{JsValue, prelude::wasm_bindgen};
 
 pub use crate::{
     batch::{Batch, BatchAck, BatchShape},
@@ -134,6 +135,13 @@ impl Instruction {
     }
 }
 
+#[wasm_bindgen]
+pub fn decode_packet(packet: Vec<u8>) -> core::result::Result<JsValue, JsValue> {
+    let packet = ZkgmPacket::decode(packet).map_err(|err| JsValue::from_str(&err.to_string()))?;
+
+    Ok(serde_wasm_bindgen::to_value(&packet)?)
+}
+
 #[cfg(test)]
 mod tests {
     use hex_literal::hex;
diff --git a/tools/rust/buildWasm.nix b/tools/rust/buildWasm.nix
new file mode 100644
index 0000000000..382d350660
--- /dev/null
+++ b/tools/rust/buildWasm.nix
@@ -0,0 +1,62 @@
+{
+  buildWorkspaceMember,
+  crateCargoToml,
+  pkgs,
+  pkgsUnstable,
+  lib,
+}:
+let
+  CARGO_BUILD_TARGET = "wasm32-unknown-unknown";
+
+  dashesToUnderscores = builtins.replaceStrings [ "-" ] [ "_" ];
+
+  mkFeaturesString =
+    features: if features == null then "" else (lib.concatMapStrings (feature: "-${feature}") features);
+
+  cargoBuildInstallPhase =
+    {
+      crateDirFromRoot,
+      contractFileNameWithoutExt,
+    }:
+    ''
+      ${pkgs.binaryen}/bin/wasm-opt target/wasm32-unknown-unknown/wasm-release/${contractFileNameWithoutExt}.wasm -Oz -o ${(crateCargoToml crateDirFromRoot).package.name}
+
+      ${pkgs.lib.meta.getExe pkgsUnstable.wasm-bindgen-cli_0_2_100} ${(crateCargoToml crateDirFromRoot).package.name} --out-dir $out --typescript --target web
+    '';
+  cargoBuildExtraArgs =
+    features:
+    "--no-default-features --lib ${
+      if features != null then lib.concatStringsSep " " ([ "--features" ] ++ features) else ""
+    }";
+  # TODO: Add back -C opt-level=z once https://github.com/CosmWasm/cosmwasm/issues/2557 is resolved
+  mkRustflags = "-C opt-level=z -C link-arg=-s -C target-cpu=mvp -C passes=adce,loop-deletion -Zlocation-detail=none";
+in
+crateDirFromRoot:
+{
+  features ? null,
+  extraBuildInputs ? [ ],
+  extraNativeBuildInputs ? [ ],
+}:
+let
+  packageName = "${(crateCargoToml crateDirFromRoot).package.name}${mkFeaturesString features}";
+
+  contract-basename = dashesToUnderscores (crateCargoToml crateDirFromRoot).package.name;
+
+  all = buildWorkspaceMember crateDirFromRoot {
+    inherit extraBuildInputs extraNativeBuildInputs;
+    buildStdTarget = CARGO_BUILD_TARGET;
+    pnameSuffix = mkFeaturesString features;
+
+    cargoBuildExtraArgs = cargoBuildExtraArgs features;
+    rustflags = mkRustflags;
+
+    cargoBuildInstallPhase = cargoBuildInstallPhase {
+      inherit crateDirFromRoot;
+      contractFileNameWithoutExt = contract-basename;
+    };
+    extraEnv = {
+      CARGO_PROFILE = "wasm-release";
+    };
+  };
+in
+all.${packageName}
diff --git a/tools/rust/buildWasmContract.nix b/tools/rust/buildWasmContract.nix
index ab607dbd21..182733a333 100644
--- a/tools/rust/buildWasmContract.nix
+++ b/tools/rust/buildWasmContract.nix
@@ -3,10 +3,6 @@
   crateCargoToml,
   pkgs,
   lib,
-  craneLib,
-  rust,
-  dbg,
-  gitRev,
 }:
 let
   CARGO_BUILD_TARGET = "wasm32-unknown-unknown";
@@ -37,7 +33,6 @@ let
 
   cargoBuildInstallPhase =
     {
-      features,
       contractFileNameWithoutExt,
       checks,
       maxSize,
@@ -90,7 +85,6 @@ let
 
     cargoBuildInstallPhase = cargoBuildInstallPhase {
       inherit
-        features
         checks
         maxSize
         ;
diff --git a/tools/rust/crane.nix b/tools/rust/crane.nix
index 43c604985b..b1ea462eb6 100644
--- a/tools/rust/crane.nix
+++ b/tools/rust/crane.nix
@@ -4,6 +4,7 @@
   perSystem =
     args@{
       pkgs,
+      pkgsUnstable,
       rust,
       dbg,
       gitRev,
@@ -630,10 +631,16 @@
               crateCargoToml
               pkgs
               lib
-              rust
-              craneLib
-              dbg
-              gitRev
+              ;
+          };
+
+          buildWasm = import ./buildWasm.nix {
+            inherit
+              buildWorkspaceMember
+              crateCargoToml
+              pkgs
+              pkgsUnstable
+              lib
               ;
           };
 
@@ -643,6 +650,7 @@
             cargoWorkspaceSrc
             buildWorkspaceMember
             buildWasmContract
+            buildWasm
             allCargoTomls
             ;
           lib = craneLib;