diff --git a/codegen/pkg/builder/builder.go b/codegen/pkg/builder/builder.go
index 22eb40d..6d32534 100644
--- a/codegen/pkg/builder/builder.go
+++ b/codegen/pkg/builder/builder.go
@@ -100,6 +100,10 @@ func (b *Builder) Build() error {
 		return err
 	}
 
+	if err := b.writeAPIVersionFile(path.Join(b.cfg.Out, "_api_version.py")); err != nil {
+		return err
+	}
+
 	took := time.Since(b.start)
 	slog.Info("sdk generated", slog.Duration("took", took))
 
diff --git a/codegen/pkg/builder/out.go b/codegen/pkg/builder/out.go
index 03a646d..25f117a 100644
--- a/codegen/pkg/builder/out.go
+++ b/codegen/pkg/builder/out.go
@@ -272,6 +272,24 @@ func (b *Builder) writeClientFile(fname string, tags []string) error {
 	return nil
 }
 
+func (b *Builder) writeAPIVersionFile(fname string) error {
+	f, err := os.OpenFile(fname, os.O_RDWR|os.O_CREATE|os.O_TRUNC, os.FileMode(0o755))
+	if err != nil {
+		return fmt.Errorf("create %q: %w", fname, err)
+	}
+	defer func() {
+		_ = f.Close()
+	}()
+
+	if err := b.templates.ExecuteTemplate(f, "api_version.py.tmpl", map[string]any{
+		"Version": b.spec.Info.Version,
+	}); err != nil {
+		return fmt.Errorf("generate api version: %w", err)
+	}
+
+	return nil
+}
+
 func openGeneratedFile(filename string) (*os.File, error) {
 	cwd, err := os.Getwd()
 	if err != nil {
diff --git a/codegen/templates/api_version.py.tmpl b/codegen/templates/api_version.py.tmpl
new file mode 100644
index 0000000..70c2173
--- /dev/null
+++ b/codegen/templates/api_version.py.tmpl
@@ -0,0 +1,2 @@
+# Code generated by `py-sdk-gen`. DO NOT EDIT.
+__api_version__ = "{{ .Version }}"
diff --git a/codegen/templates/client.py.tmpl b/codegen/templates/client.py.tmpl
index 6c7be57..0ee6702 100644
--- a/codegen/templates/client.py.tmpl
+++ b/codegen/templates/client.py.tmpl
@@ -3,7 +3,7 @@ import os
 import httpx
 import typing
 
-from ._service import Resource, AsyncResource
+from ._service import Resource, AsyncResource, runtime_headers
 {{- range .Resources }}
 from .{{ .Package }} import {{ .Name }}Resource, Async{{ .Name }}Resource
 {{- end }}
@@ -25,6 +25,7 @@ class Sumup(Resource):
 			headers={
 				"User-Agent": f"sumup-py/{self.version()}",
 				"Authorization": f"Bearer {self.api_key}",
+				**runtime_headers(),
 			},
         ))
 
@@ -51,6 +52,7 @@ class AsyncSumup(AsyncResource):
 			headers={
 				"User-Agent": f"sumup-py/{self.version()}",
 				"Authorization": f"Bearer {self.api_key}",
+				**runtime_headers(),
 			},
         ))
 
diff --git a/sumup/_api_version.py b/sumup/_api_version.py
new file mode 100644
index 0000000..9d20483
--- /dev/null
+++ b/sumup/_api_version.py
@@ -0,0 +1,2 @@
+# Code generated by `py-sdk-gen`. DO NOT EDIT.
+__api_version__ = "1.0.0"
diff --git a/sumup/_client.py b/sumup/_client.py
index 821f669..fa27d33 100644
--- a/sumup/_client.py
+++ b/sumup/_client.py
@@ -3,7 +3,7 @@
 import httpx
 import typing
 
-from ._service import Resource, AsyncResource
+from ._service import Resource, AsyncResource, runtime_headers
 from .checkouts import CheckoutsResource, AsyncCheckoutsResource
 from .customers import CustomersResource, AsyncCustomersResource
 from .members import MembersResource, AsyncMembersResource
@@ -35,6 +35,7 @@ def __init__(
                 headers={
                     "User-Agent": f"sumup-py/{self.version()}",
                     "Authorization": f"Bearer {self.api_key}",
+                    **runtime_headers(),
                 },
             )
         )
@@ -127,6 +128,7 @@ def __init__(
                 headers={
                     "User-Agent": f"sumup-py/{self.version()}",
                     "Authorization": f"Bearer {self.api_key}",
+                    **runtime_headers(),
                 },
             )
         )
diff --git a/sumup/_service.py b/sumup/_service.py
index 7e6003a..126a7a9 100644
--- a/sumup/_service.py
+++ b/sumup/_service.py
@@ -1,4 +1,9 @@
 import httpx
+import platform
+import sys
+from functools import lru_cache
+
+from ._api_version import __api_version__
 from ._version import __version__
 
 HeaderTypes = dict[str, str]
@@ -10,6 +15,48 @@ def version():
         return f"v{__version__}"
 
 
+def runtime_headers() -> dict[str, str]:
+    return dict(_runtime_headers())
+
+
+@lru_cache(maxsize=1)
+def _runtime_headers() -> tuple[tuple[str, str], ...]:
+    arch_raw = platform.machine()
+    arch = arch_raw.lower() if arch_raw else ""
+    arch_map = {
+        "x86_64": "x86_64",
+        "x64": "x86_64",
+        "amd64": "x86_64",
+        "x86": "x86",
+        "i386": "x86",
+        "i686": "x86",
+        "ia32": "x86",
+        "x32": "x86",
+        "aarch64": "arm64",
+        "arm64": "arm64",
+        "arm": "arm",
+    }
+    arch = arch_map.get(arch, "unknown")
+
+    os_name = sys.platform
+    os_map = {
+        "win32": "windows",
+        "linux": "linux",
+        "darwin": "darwin",
+    }
+    os_name = os_map.get(os_name, os_name)
+
+    return (
+        ("X-Sumup-Api-Version", __api_version__),
+        ("X-Sumup-Lang", "python"),
+        ("X-Sumup-Package-Version", __version__),
+        ("X-Sumup-Os", os_name),
+        ("X-Sumup-Arch", arch),
+        ("X-Sumup-Runtime", "python"),
+        ("X-Sumup-Runtime-Version", platform.python_version()),
+    )
+
+
 class Resource(BaseResource):
     _client: httpx.Client