diff --git a/antd-js/README.md b/antd-js/README.md
index b7c63c2..a1533a1 100644
--- a/antd-js/README.md
+++ b/antd-js/README.md
@@ -56,7 +56,7 @@ All methods are `async` and return Promises.
 
 | Method | Returns | Description |
 |--------|---------|-------------|
-| `health()` | `HealthStatus` | Check daemon health and network status |
+| `health()` | `HealthStatus` | Check daemon health — also reports antd version, EVM network, uptime, build commit, and payment contract addresses (antd ≥ 0.4.0) |
 
 ### Data
 
diff --git a/antd-js/src/models.ts b/antd-js/src/models.ts
index fb9d8aa..0786f38 100644
--- a/antd-js/src/models.ts
+++ b/antd-js/src/models.ts
@@ -1,7 +1,20 @@
-/** Health check result from the antd daemon. */
+/**
+ * Health check result from the antd daemon.
+ *
+ * The diagnostic fields (version, evmNetwork, uptimeSeconds, buildCommit,
+ * paymentTokenAddress, paymentVaultAddress) were added in antd 0.4.0. They
+ * default to "" / 0 so the type can still be constructed from the response of
+ * an older daemon that doesn't report them.
+ */
 export interface HealthStatus {
   ok: boolean;
   network: string; // "default", "local", "alpha"
+  version: string; // antd crate version, e.g. "0.4.0"
+  evmNetwork: string; // "arbitrum-one", "arbitrum-sepolia", "local", "custom"
+  uptimeSeconds: number; // seconds since the daemon process started
+  buildCommit: string; // short git SHA, "" if unknown
+  paymentTokenAddress: string; // "" if unconfigured
+  paymentVaultAddress: string; // "" if unconfigured
 }
 
 /** Result of a put/create operation. */
diff --git a/antd-js/src/rest-client.test.ts b/antd-js/src/rest-client.test.ts
index ff836a8..0d7fc7c 100644
--- a/antd-js/src/rest-client.test.ts
+++ b/antd-js/src/rest-client.test.ts
@@ -1,5 +1,5 @@
 import { describe, it, expect, beforeEach, afterEach, vi } from "vitest";
-import { RestClient } from "./rest-client.js";
+import { healthStatusFromJson, RestClient } from "./rest-client.js";
 import {
   NotFoundError,
   BadRequestError,
@@ -42,7 +42,16 @@ const routes: Route[] = [
   {
     method: "GET",
     match: (p) => p === "/health",
-    respond: () => jsonResponse(200, { status: "ok", network: "local" }),
+    respond: () => jsonResponse(200, {
+      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",
+    }),
   },
 
   // Data public PUT
@@ -226,9 +235,31 @@ describe("RestClient", () => {
   // ---- Health ----
 
   describe("health()", () => {
-    it("returns ok: true and network name", async () => {
+    it("returns ok, network, and all 6 diagnostic fields", async () => {
       const result = await client.health();
-      expect(result).toEqual({ ok: true, network: "local" });
+      expect(result).toEqual({
+        ok: true,
+        network: "local",
+        version: "0.4.0",
+        evmNetwork: "local",
+        uptimeSeconds: 42,
+        buildCommit: "abcdef123456",
+        paymentTokenAddress: "0xtoken",
+        paymentVaultAddress: "0xvault",
+      });
+    });
+
+    it("defaults diagnostic fields to empty when talking to a pre-0.4.0 daemon", () => {
+      // Helper-level regression: older daemons reply with just {status, network}.
+      const status = healthStatusFromJson({ status: "ok", network: "default" });
+      expect(status.ok).toBe(true);
+      expect(status.network).toBe("default");
+      expect(status.version).toBe("");
+      expect(status.evmNetwork).toBe("");
+      expect(status.uptimeSeconds).toBe(0);
+      expect(status.buildCommit).toBe("");
+      expect(status.paymentTokenAddress).toBe("");
+      expect(status.paymentVaultAddress).toBe("");
     });
   });
 
diff --git a/antd-js/src/rest-client.ts b/antd-js/src/rest-client.ts
index 4f3dd47..cf39511 100644
--- a/antd-js/src/rest-client.ts
+++ b/antd-js/src/rest-client.ts
@@ -14,6 +14,34 @@ import type {
   WalletBalance,
 } from "./models.js";
 
+/** Wire shape of the antd /health response. All diagnostic fields are
+ * optional so we can still parse responses from a pre-0.4.0 daemon. */
+interface HealthJson {
+  status?: string;
+  network?: string;
+  version?: string;
+  evm_network?: string;
+  uptime_seconds?: number;
+  build_commit?: string;
+  payment_token_address?: string;
+  payment_vault_address?: string;
+}
+
+/** Convert a /health JSON response to a typed HealthStatus. Diagnostic fields
+ * default to empty/zero when talking to a pre-0.4.0 daemon. */
+export function healthStatusFromJson(j: HealthJson): HealthStatus {
+  return {
+    ok: j.status === "ok",
+    network: j.network ?? "unknown",
+    version: j.version ?? "",
+    evmNetwork: j.evm_network ?? "",
+    uptimeSeconds: j.uptime_seconds ?? 0,
+    buildCommit: j.build_commit ?? "",
+    paymentTokenAddress: j.payment_token_address ?? "",
+    paymentVaultAddress: j.payment_vault_address ?? "",
+  };
+}
+
 /** Options for creating a REST client. */
 export interface RestClientOptions {
   /** Base URL of the antd daemon. Defaults to "http://localhost:8082". */
@@ -131,8 +159,8 @@ export class RestClient {
   // ---- Health ----
 
   async health(): Promise<HealthStatus> {
-    const j = await this.getJson<{ status: string; network: string }>("/health");
-    return { ok: j.status === "ok", network: j.network ?? "unknown" };
+    const j = await this.getJson<HealthJson>("/health");
+    return healthStatusFromJson(j);
   }
 
   // ---- Data ----