diff --git a/src/common/serialization/clap/ext/params.cpp b/src/common/serialization/clap/ext/params.cpp
new file mode 100644
index 00000000..fe8def80
--- /dev/null
+++ b/src/common/serialization/clap/ext/params.cpp
@@ -0,0 +1,49 @@
+// yabridge: a Wine plugin bridge
+// Copyright (C) 2020-2022 Robbert van der Helm
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "params.h"
+
+#include "../../../utils.h"
+
+namespace clap {
+namespace ext {
+namespace params {
+
+ParamInfo::ParamInfo(const clap_param_info_t& original)
+    : id(original.id),
+      flags(original.flags),
+      cookie(reinterpret_cast<size_t>(original.cookie)),
+      name(original.name),
+      module(original.module),
+      min_value(original.min_value),
+      max_value(original.max_value),
+      default_value(original.default_value) {}
+
+void ParamInfo::reconstruct(clap_param_info_t& port_info) const {
+    port_info = clap_param_info_t{};
+    port_info.id = id;
+    port_info.flags = flags;
+    port_info.cookie = reinterpret_cast<void*>(static_cast<size_t>(cookie));
+    strlcpy_buffer<sizeof(port_info.name)>(port_info.name, name);
+    strlcpy_buffer<sizeof(port_info.module)>(port_info.module, module);
+    port_info.min_value = min_value;
+    port_info.max_value = max_value;
+    port_info.default_value = default_value;
+}
+
+}  // namespace params
+}  // namespace ext
+}  // namespace clap
diff --git a/src/common/serialization/clap/ext/params.h b/src/common/serialization/clap/ext/params.h
new file mode 100644
index 00000000..6a397c3b
--- /dev/null
+++ b/src/common/serialization/clap/ext/params.h
@@ -0,0 +1,300 @@
+// yabridge: a Wine plugin bridge
+// Copyright (C) 2020-2022 Robbert van der Helm
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#pragma once
+
+#include <optional>
+#include <string>
+#include <vector>
+
+#include <clap/ext/params.h>
+
+#include "../../../bitsery/ext/in-place-optional.h"
+#include "../../common.h"
+
+// Serialization messages for `clap/ext/params.h`
+
+namespace clap {
+namespace ext {
+namespace params {
+
+/**
+ * A serializable version of `clap_param_info` that owns all of the data it
+ * references.
+ */
+struct ParamInfo {
+    /**
+     * Parse a native `clap_param_info` struct so it can be serialized and sent
+     * to the Wine plugin host.
+     */
+    ParamInfo(const clap_param_info_t& original);
+
+    /**
+     * Default constructor for bitsery.
+     */
+    ParamInfo() {}
+
+    /**
+     * Write the stored information to a host provided info struct.
+     */
+    void reconstruct(clap_param_info_t& port_info) const;
+
+    clap_id id;
+    clap_param_info_flags flags;
+    // This is the `void*` provided by the plugin, as an integer
+    native_size_t cookie;
+    std::string name;
+    std::string module;
+    double min_value;
+    double max_value;
+    double default_value;
+
+    template <typename S>
+    void serialize(S& s) {
+        s.value4b(id);
+        s.value4b(flags);
+        s.value8b(cookie);
+        s.text1b(name, 4096);
+        s.text1b(module, 4096);
+        s.value8b(min_value);
+        s.value8b(max_value);
+        s.value8b(default_value);
+    }
+};
+
+namespace plugin {
+
+/**
+ * Message struct for `clap_plugin_params::count()`.
+ */
+struct Count {
+    using Response = PrimitiveResponse<uint32_t>;
+
+    native_size_t instance_id;
+
+    template <typename S>
+    void serialize(S& s) {
+        s.value8b(instance_id);
+    }
+};
+
+/**
+ * The response to the `clap::ext::params::GetInfo` message defined below.
+ */
+struct GetInfoResponse {
+    std::optional<ParamInfo> result;
+
+    template <typename S>
+    void serialize(S& s) {
+        s.ext(result, bitsery::ext::InPlaceOptional(),
+              [](S& s, auto& v) { s.object(v); });
+    }
+};
+
+/**
+ * Message struct for `clap_plugin_params::get_info()`.
+ */
+struct GetInfo {
+    using Response = GetInfoResponse;
+
+    native_size_t instance_id;
+    uint32_t param_index;
+
+    template <typename S>
+    void serialize(S& s) {
+        s.value8b(instance_id);
+        s.value4b(param_index);
+    }
+};
+
+/**
+ * The response to the `clap::ext::params::GetValue` message defined below.
+ */
+struct GetValueResponse {
+    std::optional<double> result;
+
+    template <typename S>
+    void serialize(S& s) {
+        s.ext(result, bitsery::ext::InPlaceOptional(),
+              [](S& s, auto& v) { s.value8b(v); });
+    }
+};
+
+/**
+ * Message struct for `clap_plugin_params::get_value()`.
+ */
+struct GetValue {
+    using Response = GetValueResponse;
+
+    native_size_t instance_id;
+    clap_id param_id;
+
+    template <typename S>
+    void serialize(S& s) {
+        s.value8b(instance_id);
+        s.value4b(param_id);
+    }
+};
+
+/**
+ * The response to the `clap::ext::params::ValueToText` message defined below.
+ */
+struct ValueToTextResponse {
+    std::optional<std::string> result;
+
+    template <typename S>
+    void serialize(S& s) {
+        s.ext(result, bitsery::ext::InPlaceOptional(),
+              [](S& s, auto& v) { s.text1b(v, 4096); });
+    }
+};
+
+/**
+ * Message struct for `clap_plugin_params::value_to_text()`.
+ */
+struct ValueToText {
+    using Response = ValueToTextResponse;
+
+    native_size_t instance_id;
+    clap_id param_id;
+    double value;
+
+    template <typename S>
+    void serialize(S& s) {
+        s.value8b(instance_id);
+        s.value4b(param_id);
+        s.value8b(value);
+    }
+};
+
+/**
+ * The response to the `clap::ext::params::TextToValue` message defined below.
+ */
+struct TextToValueResponse {
+    std::optional<double> result;
+
+    template <typename S>
+    void serialize(S& s) {
+        s.ext(result, bitsery::ext::InPlaceOptional(),
+              [](S& s, auto& v) { s.value8b(v); });
+    }
+};
+
+/**
+ * Message struct for `clap_plugin_params::text_to_value()`.
+ */
+struct TextToValue {
+    using Response = TextToValueResponse;
+
+    native_size_t instance_id;
+    clap_id param_id;
+    std::string display;
+
+    template <typename S>
+    void serialize(S& s) {
+        s.value8b(instance_id);
+        s.value4b(param_id);
+        s.text1b(display, 4096);
+    }
+};
+
+/**
+ * The response to the `clap::ext::params::Flush` message defined below.
+ */
+struct FlushResponse {
+    // TODO: Output events
+
+    template <typename S>
+    void serialize(S& s) {
+        // TODO: Output events
+    }
+};
+
+// TODO: This can be either a main thread or an audio thread function call
+//       depending on whether or not the plugin is active
+/**
+ * Message struct for `clap_plugin_params::flush()`.
+ */
+struct Flush {
+    using Response = FlushResponse;
+
+    native_size_t instance_id;
+    // TODO: Input events
+
+    template <typename S>
+    void serialize(S& s) {
+        s.value8b(instance_id);
+        // TODO: Input events
+    }
+};
+
+}  // namespace plugin
+
+namespace host {
+
+/**
+ * Message struct for `clap_host_params::rescan()`.
+ */
+struct Rescan {
+    using Response = Ack;
+
+    native_size_t owner_instance_id;
+    clap_param_rescan_flags flags;
+
+    template <typename S>
+    void serialize(S& s) {
+        s.value8b(owner_instance_id);
+        s.value4b(flags);
+    }
+};
+
+/**
+ * Message struct for `clap_host_params::clear()`.
+ */
+struct Clear {
+    using Response = Ack;
+
+    native_size_t owner_instance_id;
+    clap_id param_id;
+    clap_param_clear_flags flags;
+
+    template <typename S>
+    void serialize(S& s) {
+        s.value8b(owner_instance_id);
+        s.value4b(param_id);
+        s.value4b(flags);
+    }
+};
+
+/**
+ * Message struct for `clap_host_params::request_flush()`.
+ */
+struct RequestFlush {
+    using Response = Ack;
+
+    native_size_t owner_instance_id;
+
+    template <typename S>
+    void serialize(S& s) {
+        s.value8b(owner_instance_id);
+    }
+};
+
+}  // namespace host
+
+}  // namespace params
+}  // namespace ext
+}  // namespace clap
diff --git a/src/plugin/meson.build b/src/plugin/meson.build
index f6e2e659..c0139462 100644
--- a/src/plugin/meson.build
+++ b/src/plugin/meson.build
@@ -79,6 +79,7 @@ if with_clap
     '../common/process.cpp',
     '../common/serialization/clap/ext/audio-ports.cpp',
     '../common/serialization/clap/ext/note-ports.cpp',
+    '../common/serialization/clap/ext/params.cpp',
     '../common/serialization/clap/host.cpp',
     '../common/serialization/clap/plugin.cpp',
     '../common/utils.cpp',
diff --git a/src/wine-host/meson.build b/src/wine-host/meson.build
index 375ffc41..d901fa65 100644
--- a/src/wine-host/meson.build
+++ b/src/wine-host/meson.build
@@ -82,6 +82,7 @@ if with_clap
     '../common/logging/clap.cpp',
     '../common/serialization/clap/ext/audio-ports.cpp',
     '../common/serialization/clap/ext/note-ports.cpp',
+    '../common/serialization/clap/ext/params.cpp',
     '../common/serialization/clap/plugin.cpp',
     'bridges/clap-impls/host-proxy.cpp',
     'bridges/clap.cpp',