diff --git a/antd-cpp/include/antd/models.hpp b/antd-cpp/include/antd/models.hpp
index c3dd450..dff2ee6 100644
--- a/antd-cpp/include/antd/models.hpp
+++ b/antd-cpp/include/antd/models.hpp
@@ -6,10 +6,21 @@
 
 namespace antd {
 
-/// Result of a health check.
+/// Health check result from the antd daemon.
+///
+/// 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 so the struct stays usable when talking to an
+/// older daemon that doesn't report them.
 struct HealthStatus {
     bool ok{false};
     std::string network;
+    std::string version;                ///< antd crate version, e.g. "0.4.0"
+    std::string evm_network;            ///< "arbitrum-one", "arbitrum-sepolia", "local", "custom"
+    std::uint64_t uptime_seconds{0};    ///< seconds since the daemon process started
+    std::string build_commit;           ///< short git SHA, "" if unknown
+    std::string payment_token_address;  ///< "" if unconfigured
+    std::string payment_vault_address;  ///< "" if unconfigured
 };
 
 /// Result of a put/create operation.
diff --git a/antd-cpp/src/client.cpp b/antd-cpp/src/client.cpp
index d35c781..3350d02 100644
--- a/antd-cpp/src/client.cpp
+++ b/antd-cpp/src/client.cpp
@@ -100,6 +100,12 @@ HealthStatus Client::health() {
     return HealthStatus{
         .ok = j.value("status", "") == "ok",
         .network = j.value("network", ""),
+        .version = j.value("version", ""),
+        .evm_network = j.value("evm_network", ""),
+        .uptime_seconds = j.value<std::uint64_t>("uptime_seconds", 0),
+        .build_commit = j.value("build_commit", ""),
+        .payment_token_address = j.value("payment_token_address", ""),
+        .payment_vault_address = j.value("payment_vault_address", ""),
     };
 }
 
diff --git a/antd-cpp/src/grpc_client.cpp b/antd-cpp/src/grpc_client.cpp
index fa8512e..388aa24 100644
--- a/antd-cpp/src/grpc_client.cpp
+++ b/antd-cpp/src/grpc_client.cpp
@@ -86,6 +86,12 @@ HealthStatus GrpcClient::health() {
     return 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-cpp/tests/test_client.cpp b/antd-cpp/tests/test_client.cpp
index af23458..2f36953 100644
--- a/antd-cpp/tests/test_client.cpp
+++ b/antd-cpp/tests/test_client.cpp
@@ -82,13 +82,56 @@ TEST_CASE("AntdError subtypes are catchable as AntdError") {
 // ---------------------------------------------------------------------------
 
 TEST_CASE("HealthStatus from JSON") {
-    auto j = json::parse(R"({"status":"ok","network":"local"})");
-    antd::HealthStatus h;
-    h.ok = j.value("status", "") == "ok";
-    h.network = j.value("network", "");
+    auto j = json::parse(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"
+    })");
+    antd::HealthStatus h{
+        .ok = j.value("status", "") == "ok",
+        .network = j.value("network", ""),
+        .version = j.value("version", ""),
+        .evm_network = j.value("evm_network", ""),
+        .uptime_seconds = j.value<std::uint64_t>("uptime_seconds", 0),
+        .build_commit = j.value("build_commit", ""),
+        .payment_token_address = j.value("payment_token_address", ""),
+        .payment_vault_address = j.value("payment_vault_address", ""),
+    };
 
     CHECK(h.ok);
     CHECK(h.network == "local");
+    CHECK(h.version == "0.4.0");
+    CHECK(h.evm_network == "local");
+    CHECK(h.uptime_seconds == 42);
+    CHECK(h.build_commit == "abcdef123456");
+    CHECK(h.payment_token_address == "0xtoken");
+    CHECK(h.payment_vault_address == "0xvault");
+}
+
+TEST_CASE("HealthStatus defaults populate when pre-0.4.0 daemon omits diagnostics") {
+    auto j = json::parse(R"({"status":"ok","network":"default"})");
+    antd::HealthStatus h{
+        .ok = j.value("status", "") == "ok",
+        .network = j.value("network", ""),
+        .version = j.value("version", ""),
+        .evm_network = j.value("evm_network", ""),
+        .uptime_seconds = j.value<std::uint64_t>("uptime_seconds", 0),
+        .build_commit = j.value("build_commit", ""),
+        .payment_token_address = j.value("payment_token_address", ""),
+        .payment_vault_address = j.value("payment_vault_address", ""),
+    };
+
+    CHECK(h.ok);
+    CHECK(h.network == "default");
+    CHECK(h.version.empty());
+    CHECK(h.evm_network.empty());
+    CHECK(h.uptime_seconds == 0);
+    CHECK(h.build_commit.empty());
 }
 
 TEST_CASE("PutResult from JSON") {