diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 8935e93..b8dda9b 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.28.0"
+  ".": "0.29.0"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index bf635d7..f0d8039 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 0.29.0 (2026-01-24)
+
+Full Changelog: [v0.28.0...v0.29.0](https://github.com/kernel/kernel-go-sdk/compare/v0.28.0...v0.29.0)
+
+### Features
+
+* **client:** add a convenient param.SetJSON helper ([00e86b2](https://github.com/kernel/kernel-go-sdk/commit/00e86b280372cea0186578a4e73bf857310233e8))
+
 ## 0.28.0 (2026-01-22)
 
 Full Changelog: [v0.27.0...v0.28.0](https://github.com/kernel/kernel-go-sdk/compare/v0.27.0...v0.28.0)
diff --git a/README.md b/README.md
index 06ad356..e8139cf 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,7 @@ Or to pin the version:
 <!-- x-release-please-start-version -->
 
 ```sh
-go get -u 'github.com/kernel/kernel-go-sdk@v0.28.0'
+go get -u 'github.com/kernel/kernel-go-sdk@v0.29.0'
 ```
 
 <!-- x-release-please-end -->
diff --git a/internal/version.go b/internal/version.go
index 9efbcca..ecc4b71 100644
--- a/internal/version.go
+++ b/internal/version.go
@@ -2,4 +2,4 @@
 
 package internal
 
-const PackageVersion = "0.28.0" // x-release-please-version
+const PackageVersion = "0.29.0" // x-release-please-version
diff --git a/packages/param/param.go b/packages/param/param.go
index 75e8528..5d5e08c 100644
--- a/packages/param/param.go
+++ b/packages/param/param.go
@@ -41,6 +41,19 @@ func Override[T ParamStruct, PtrT InferPtr[T]](v any) T {
 	return *pt
 }
 
+// SetJSON configures a param struct to serialize with the provided raw JSON data.
+// Use this when you have existing JSON that you want to send as request parameters.
+//
+//	var req example.NewUserParams
+//	var rawJSON = []byte(`{"name": "...", "age": 40}`)
+//	param.SetJSON(rawJSON, &req)
+//	res, err := client.Users.New(ctx, req)
+//
+// Note: The struct's existing fields will be ignored; only the provided JSON is serialized.
+func SetJSON(rawJSON []byte, ptr anyParamStruct) {
+	ptr.setMetadata(json.RawMessage(rawJSON))
+}
+
 // IsOmitted returns true if v is the zero value of its type.
 //
 // If IsOmitted is true, and the field uses a `json:"...,omitzero"` tag,
@@ -91,6 +104,11 @@ type ParamStruct interface {
 	extraFields() map[string]any
 }
 
+// A pointer to ParamStruct
+type anyParamStruct interface {
+	setMetadata(any)
+}
+
 // This is an implementation detail and should never be explicitly set.
 type InferPtr[T ParamStruct] interface {
 	setMetadata(any)