diff --git a/antd-rust/src/client.rs b/antd-rust/src/client.rs
index 3c021ff..1cb28ee 100644
--- a/antd-rust/src/client.rs
+++ b/antd-rust/src/client.rs
@@ -162,6 +162,15 @@ impl Client {
         Ok(HealthStatus {
             ok: Self::str_field(&j, "status") == "ok",
             network: Self::str_field(&j, "network"),
+            version: Self::str_field(&j, "version"),
+            evm_network: Self::str_field(&j, "evm_network"),
+            uptime_seconds: j
+                .get("uptime_seconds")
+                .and_then(|v| v.as_u64())
+                .unwrap_or(0),
+            build_commit: Self::str_field(&j, "build_commit"),
+            payment_token_address: Self::str_field(&j, "payment_token_address"),
+            payment_vault_address: Self::str_field(&j, "payment_vault_address"),
         })
     }
 
diff --git a/antd-rust/src/grpc_client.rs b/antd-rust/src/grpc_client.rs
index 6f93710..b56d7a0 100644
--- a/antd-rust/src/grpc_client.rs
+++ b/antd-rust/src/grpc_client.rs
@@ -81,6 +81,12 @@ impl GrpcClient {
         Ok(HealthStatus {
             ok: resp.status == "ok",
             network: resp.network,
+            version: resp.version,
+            evm_network: resp.evm_network,
+            uptime_seconds: resp.uptime_seconds,
+            build_commit: resp.build_commit,
+            payment_token_address: resp.payment_token_address,
+            payment_vault_address: resp.payment_vault_address,
         })
     }
 
diff --git a/antd-rust/src/grpc_tests.rs b/antd-rust/src/grpc_tests.rs
index 1ed5892..ff2d031 100644
--- a/antd-rust/src/grpc_tests.rs
+++ b/antd-rust/src/grpc_tests.rs
@@ -20,11 +20,12 @@ impl v1::health_service_server::HealthService for MockHealthService {
         Ok(Response::new(v1::HealthCheckResponse {
             status: "ok".to_string(),
             network: "local".to_string(),
-            // Diagnostic fields added in 0.4.0 — left as defaults here
-            // because antd-rust's HealthStatus model has not yet been
-            // extended (tracked in issue #37). The mock just needs to
-            // satisfy the wire type.
-            ..Default::default()
+            version: "0.4.0".to_string(),
+            evm_network: "local".to_string(),
+            uptime_seconds: 42,
+            build_commit: "abcdef123456".to_string(),
+            payment_token_address: "0xtoken".to_string(),
+            payment_vault_address: "0xvault".to_string(),
         }))
     }
 }
@@ -275,6 +276,12 @@ async fn test_grpc_health() {
     let health = client.health().await.unwrap();
     assert!(health.ok);
     assert_eq!(health.network, "local");
+    assert_eq!(health.version, "0.4.0");
+    assert_eq!(health.evm_network, "local");
+    assert_eq!(health.uptime_seconds, 42);
+    assert_eq!(health.build_commit, "abcdef123456");
+    assert_eq!(health.payment_token_address, "0xtoken");
+    assert_eq!(health.payment_vault_address, "0xvault");
 }
 
 #[tokio::test]
diff --git a/antd-rust/src/models.rs b/antd-rust/src/models.rs
index a688879..f72d680 100644
--- a/antd-rust/src/models.rs
+++ b/antd-rust/src/models.rs
@@ -1,10 +1,27 @@
 use serde::{Deserialize, Serialize};
 
 /// Result of a health check against the antd daemon.
-#[derive(Debug, Clone, Serialize, Deserialize)]
+///
+/// The diagnostic fields (`version`, `evm_network`, `uptime_seconds`,
+/// `build_commit`, `payment_token_address`, `payment_vault_address`) were
+/// added in antd 0.4.0. They default to empty / 0 via `#[serde(default)]`,
+/// so deserialization tolerates pre-0.4.0 daemon responses.
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
 pub struct HealthStatus {
     pub ok: bool,
     pub network: String,
+    #[serde(default)]
+    pub version: String,
+    #[serde(default)]
+    pub evm_network: String,
+    #[serde(default)]
+    pub uptime_seconds: u64,
+    #[serde(default)]
+    pub build_commit: String,
+    #[serde(default)]
+    pub payment_token_address: String,
+    #[serde(default)]
+    pub payment_vault_address: String,
 }
 
 /// Result of a put/create operation containing cost and address.
diff --git a/antd-rust/src/tests.rs b/antd-rust/src/tests.rs
index be8f614..3de9b02 100644
--- a/antd-rust/src/tests.rs
+++ b/antd-rust/src/tests.rs
@@ -15,7 +15,18 @@ fn mock_health(server: &mut ServerGuard) -> Mock {
         .mock("GET", "/health")
         .with_status(200)
         .with_header("content-type", "application/json")
-        .with_body(r#"{"status":"ok","network":"local"}"#)
+        .with_body(
+            r#"{
+                "status":"ok",
+                "network":"local",
+                "version":"0.4.0",
+                "evm_network":"local",
+                "uptime_seconds":42,
+                "build_commit":"abcdef123456",
+                "payment_token_address":"0xtoken",
+                "payment_vault_address":"0xvault"
+            }"#,
+        )
         .create()
 }
 
@@ -201,6 +212,12 @@ async fn test_health() {
     let health = client.health().await.unwrap();
     assert!(health.ok);
     assert_eq!(health.network, "local");
+    assert_eq!(health.version, "0.4.0");
+    assert_eq!(health.evm_network, "local");
+    assert_eq!(health.uptime_seconds, 42);
+    assert_eq!(health.build_commit, "abcdef123456");
+    assert_eq!(health.payment_token_address, "0xtoken");
+    assert_eq!(health.payment_vault_address, "0xvault");
 }
 
 #[tokio::test]