diff --git a/cmd/example/main.go b/cmd/example/main.go
index 72ce717..2479323 100644
--- a/cmd/example/main.go
+++ b/cmd/example/main.go
@@ -26,32 +26,38 @@ import (
 )
 
 func main() {
-	var endpoint, pname string
+	var endpoint, pname, ptype string
 	flag.StringVar(&endpoint, "endpoint", "", "Trusty API endpoint to call")
 	flag.StringVar(&pname, "pname", "", "Package name")
+	flag.StringVar(&ptype, "ptype", "", "Package type")
 	flag.Parse()
 
 	ctx := context.Background()
 	client := v2client.New()
 
+	input := &v2types.Dependency{
+		PackageName: pname,
+		PackageType: ptype,
+	}
+
 	switch endpoint {
 	case "summary":
-		if err := summary(ctx, client, pname); err != nil {
+		if err := summary(ctx, client, input); err != nil {
 			fmt.Fprintf(os.Stderr, "error calling endpoint: %s\n", err)
 			os.Exit(1)
 		}
 	case "pkg-meta":
-		if err := pkg(ctx, client, pname); err != nil {
+		if err := pkg(ctx, client, input); err != nil {
 			fmt.Fprintf(os.Stderr, "error calling endpoint: %s\n", err)
 			os.Exit(1)
 		}
 	case "alternatives":
-		if err := alternatives(ctx, client, pname); err != nil {
+		if err := alternatives(ctx, client, input); err != nil {
 			fmt.Fprintf(os.Stderr, "error calling endpoint: %s\n", err)
 			os.Exit(1)
 		}
 	case "provenance":
-		if err := provenance(ctx, client, pname); err != nil {
+		if err := provenance(ctx, client, input); err != nil {
 			fmt.Fprintf(os.Stderr, "error calling endpoint: %s\n", err)
 			os.Exit(1)
 		}
@@ -64,10 +70,12 @@ func main() {
 	}
 }
 
-func summary(ctx context.Context, client v2client.Trusty, pname string) error {
-	res, err := client.Summary(ctx, &v2types.Dependency{
-		PackageName: pname,
-	})
+func summary(
+	ctx context.Context,
+	client v2client.Trusty,
+	input *v2types.Dependency,
+) error {
+	res, err := client.Summary(ctx, input)
 	if err != nil {
 		return err
 	}
@@ -76,10 +84,12 @@ func summary(ctx context.Context, client v2client.Trusty, pname string) error {
 	return nil
 }
 
-func pkg(ctx context.Context, client v2client.Trusty, pname string) error {
-	res, err := client.PackageMetadata(ctx, &v2types.Dependency{
-		PackageName: pname,
-	})
+func pkg(
+	ctx context.Context,
+	client v2client.Trusty,
+	input *v2types.Dependency,
+) error {
+	res, err := client.PackageMetadata(ctx, input)
 	if err != nil {
 		return err
 	}
@@ -93,10 +103,12 @@ func pkg(ctx context.Context, client v2client.Trusty, pname string) error {
 	return nil
 }
 
-func alternatives(ctx context.Context, client v2client.Trusty, pname string) error {
-	res, err := client.Alternatives(ctx, &v2types.Dependency{
-		PackageName: pname,
-	})
+func alternatives(
+	ctx context.Context,
+	client v2client.Trusty,
+	input *v2types.Dependency,
+) error {
+	res, err := client.Alternatives(ctx, input)
 	if err != nil {
 		return err
 	}
@@ -105,10 +117,12 @@ func alternatives(ctx context.Context, client v2client.Trusty, pname string) err
 	return nil
 }
 
-func provenance(ctx context.Context, client v2client.Trusty, pname string) error {
-	res, err := client.Provenance(ctx, &v2types.Dependency{
-		PackageName: pname,
-	})
+func provenance(
+	ctx context.Context,
+	client v2client.Trusty,
+	input *v2types.Dependency,
+) error {
+	res, err := client.Provenance(ctx, input)
 	if err != nil {
 		return err
 	}
diff --git a/internal/client/client.go b/internal/client/client.go
index b2c663a..434588e 100644
--- a/internal/client/client.go
+++ b/internal/client/client.go
@@ -337,6 +337,9 @@ func (t *Trusty) Summary(
 	if dep.PackageName == "" {
 		return nil, fmt.Errorf("dependency has no name defined")
 	}
+	if dep.PackageType == "" {
+		return nil, fmt.Errorf("dependency has no ecosystem defined")
+	}
 
 	u, err := urlFor(t.Options.BaseURL, v2SummaryPath)
 	if err != nil {
@@ -347,9 +350,7 @@ func (t *Trusty) Summary(
 	// package_version.
 	q := u.Query()
 	q.Set("package_name", dep.PackageName)
-	if dep.PackageType != nil && *dep.PackageType != "" {
-		q.Set("package_type", strings.ToLower(*dep.PackageType))
-	}
+	q.Set("package_type", strings.ToLower(dep.PackageType))
 	if dep.PackageVersion != nil && *dep.PackageVersion != "" {
 		q.Set("package_version", *dep.PackageVersion)
 	}
@@ -369,6 +370,9 @@ func (t *Trusty) PackageMetadata(
 	if dep.PackageName == "" {
 		return nil, fmt.Errorf("dependency has no name defined")
 	}
+	if dep.PackageType == "" {
+		return nil, fmt.Errorf("dependency has no ecosystem defined")
+	}
 
 	u, err := urlFor(t.Options.BaseURL, v2PkgPath)
 	if err != nil {
@@ -379,9 +383,7 @@ func (t *Trusty) PackageMetadata(
 	// package_version.
 	q := u.Query()
 	q.Set("package_name", dep.PackageName)
-	if dep.PackageType != nil && *dep.PackageType != "" {
-		q.Set("package_type", strings.ToLower(*dep.PackageType))
-	}
+	q.Set("package_type", strings.ToLower(dep.PackageType))
 	if dep.PackageVersion != nil && *dep.PackageVersion != "" {
 		q.Set("package_version", *dep.PackageVersion)
 	}
@@ -399,6 +401,9 @@ func (t *Trusty) Alternatives(
 	if dep.PackageName == "" {
 		return nil, fmt.Errorf("dependency has no name defined")
 	}
+	if dep.PackageType == "" {
+		return nil, fmt.Errorf("dependency has no ecosystem defined")
+	}
 
 	u, err := urlFor(t.Options.BaseURL, v2Alternatives)
 	if err != nil {
@@ -409,9 +414,7 @@ func (t *Trusty) Alternatives(
 	// package_version.
 	q := u.Query()
 	q.Set("package_name", dep.PackageName)
-	if dep.PackageType != nil && *dep.PackageType != "" {
-		q.Set("package_type", strings.ToLower(*dep.PackageType))
-	}
+	q.Set("package_type", strings.ToLower(dep.PackageType))
 	if dep.PackageVersion != nil && *dep.PackageVersion != "" {
 		q.Set("package_version", *dep.PackageVersion)
 	}
@@ -429,6 +432,9 @@ func (t *Trusty) Provenance(
 	if dep.PackageName == "" {
 		return nil, fmt.Errorf("dependency has no name defined")
 	}
+	if dep.PackageType == "" {
+		return nil, fmt.Errorf("dependency has no ecosystem defined")
+	}
 
 	u, err := urlFor(t.Options.BaseURL, v2Provenance)
 	if err != nil {
@@ -439,9 +445,7 @@ func (t *Trusty) Provenance(
 	// package_version.
 	q := u.Query()
 	q.Set("package_name", dep.PackageName)
-	if dep.PackageType != nil && *dep.PackageType != "" {
-		q.Set("package_type", strings.ToLower(*dep.PackageType))
-	}
+	q.Set("package_type", strings.ToLower(dep.PackageType))
 	if dep.PackageVersion != nil && *dep.PackageVersion != "" {
 		q.Set("package_version", *dep.PackageVersion)
 	}
diff --git a/pkg/v2/types/types.go b/pkg/v2/types/types.go
index 7dad632..603be6e 100644
--- a/pkg/v2/types/types.go
+++ b/pkg/v2/types/types.go
@@ -28,7 +28,7 @@ import (
 // Dependency represents request arguments for various endpoints.
 type Dependency struct {
 	PackageName    string
-	PackageType    *string
+	PackageType    string
 	PackageVersion *string
 }