diff --git a/.changeset/sandbox-eve-client-header.md b/.changeset/sandbox-eve-client-header.md
new file mode 100644
index 000000000..bf43dd934
--- /dev/null
+++ b/.changeset/sandbox-eve-client-header.md
@@ -0,0 +1,5 @@
+---
+"eve": patch
+---
+
+Sandbox API requests now send an `x-eve-client: eve/<version>` header.
diff --git a/packages/eve/src/execution/sandbox/bindings/vercel-client-header.test.ts b/packages/eve/src/execution/sandbox/bindings/vercel-client-header.test.ts
new file mode 100644
index 000000000..f443e4783
--- /dev/null
+++ b/packages/eve/src/execution/sandbox/bindings/vercel-client-header.test.ts
@@ -0,0 +1,41 @@
+import { describe, expect, it, vi } from "vitest";
+
+import {
+  EVE_SANDBOX_CLIENT_HEADER,
+  withEveSandboxClientHeader,
+} from "#execution/sandbox/bindings/vercel-client-header.js";
+
+function headerOf(init: RequestInit | undefined): string | null {
+  return new Headers(init?.headers).get(EVE_SANDBOX_CLIENT_HEADER);
+}
+
+describe("withEveSandboxClientHeader", () => {
+  it("stamps the eve client header as eve/<version>", async () => {
+    const inner = vi.fn<typeof globalThis.fetch>().mockResolvedValue(new Response());
+    const wrapped = withEveSandboxClientHeader(inner);
+
+    await wrapped("https://api.vercel.com/sandboxes");
+
+    const [, init] = inner.mock.calls[0]!;
+    expect(headerOf(init)).toMatch(/^eve\/.+/);
+  });
+
+  it("preserves existing headers", async () => {
+    const inner = vi.fn<typeof globalThis.fetch>().mockResolvedValue(new Response());
+    const wrapped = withEveSandboxClientHeader(inner);
+
+    await wrapped("https://api.vercel.com/sandboxes", {
+      headers: { "user-agent": "vercel/sandbox/1.0.0" },
+    });
+
+    const [, init] = inner.mock.calls[0]!;
+    const headers = new Headers(init?.headers);
+    expect(headers.get("user-agent")).toBe("vercel/sandbox/1.0.0");
+    expect(headers.get(EVE_SANDBOX_CLIENT_HEADER)).toMatch(/^eve\/.+/);
+  });
+
+  it("delegates to globalThis.fetch when no inner fetch is supplied", () => {
+    const wrapped = withEveSandboxClientHeader();
+    expect(typeof wrapped).toBe("function");
+  });
+});
diff --git a/packages/eve/src/execution/sandbox/bindings/vercel-client-header.ts b/packages/eve/src/execution/sandbox/bindings/vercel-client-header.ts
new file mode 100644
index 000000000..48a9a222e
--- /dev/null
+++ b/packages/eve/src/execution/sandbox/bindings/vercel-client-header.ts
@@ -0,0 +1,29 @@
+import { resolveInstalledPackageInfo } from "#internal/application/package.js";
+
+/**
+ * Request header eve stamps on every Vercel Sandbox API call so the sandbox
+ * control plane can attribute traffic to eve and its version.
+ */
+export const EVE_SANDBOX_CLIENT_HEADER = "x-eve-client";
+
+/**
+ * Wraps a `fetch` implementation so every request carries the
+ * {@link EVE_SANDBOX_CLIENT_HEADER} identifying the eve client and version.
+ */
+export function withEveSandboxClientHeader(
+  inner: typeof globalThis.fetch = globalThis.fetch,
+): typeof globalThis.fetch {
+  const { name, version } = resolveInstalledPackageInfo();
+  const clientId = `${name}/${version}`;
+
+  return (input, init) => {
+    const headers = new Headers(
+      init?.headers ??
+        (typeof input === "object" && input !== null && "headers" in input
+          ? (input as Request).headers
+          : undefined),
+    );
+    headers.set(EVE_SANDBOX_CLIENT_HEADER, clientId);
+    return inner(input, { ...init, headers });
+  };
+}
diff --git a/packages/eve/src/execution/sandbox/bindings/vercel-create-sdk.ts b/packages/eve/src/execution/sandbox/bindings/vercel-create-sdk.ts
index 80a6933b2..f3992508f 100644
--- a/packages/eve/src/execution/sandbox/bindings/vercel-create-sdk.ts
+++ b/packages/eve/src/execution/sandbox/bindings/vercel-create-sdk.ts
@@ -1,3 +1,4 @@
+import { getVercelSandboxFetch } from "#execution/sandbox/bindings/vercel-credentials.js";
 import type {
   VercelCreateOptions,
   VercelModule,
@@ -27,6 +28,7 @@ export async function createVercelEveImageSandbox(input: {
   const createOptions: VercelSandboxCreateParams = {
     ...input.createOptions,
     __image: VERCEL_EVE_SANDBOX_IMAGE,
+    fetch: getVercelSandboxFetch(input.createOptions),
   };
   return await input.sandboxModule.Sandbox.create(createOptions);
 }
diff --git a/packages/eve/src/execution/sandbox/bindings/vercel-credentials.ts b/packages/eve/src/execution/sandbox/bindings/vercel-credentials.ts
index c0b5578f4..f6b051135 100644
--- a/packages/eve/src/execution/sandbox/bindings/vercel-credentials.ts
+++ b/packages/eve/src/execution/sandbox/bindings/vercel-credentials.ts
@@ -1,9 +1,10 @@
 import { getVercelOidcToken } from "#compiled/@vercel/oidc/index.js";
+import { withEveSandboxClientHeader } from "#execution/sandbox/bindings/vercel-client-header.js";
 import type { VercelCreateOptions } from "#execution/sandbox/bindings/vercel-sdk-types.js";
 
 export function getVercelSandboxFetch(createOptions: VercelCreateOptions): typeof globalThis.fetch {
   const fetchOverride = (createOptions as { readonly fetch?: typeof globalThis.fetch }).fetch;
-  return fetchOverride ?? globalThis.fetch;
+  return withEveSandboxClientHeader(fetchOverride ?? globalThis.fetch);
 }
 
 export async function getVercelSandboxCredentials(