diff --git a/client.go b/client.go
index 62d3690..df99b72 100644
--- a/client.go
+++ b/client.go
@@ -27,6 +27,7 @@ type (
 		client          *http.Client
 		commonHeaders   http.Header
 		locked          bool
+		auth            *AuthInfo
 	}
 )
 
@@ -195,7 +196,9 @@ func (c *Client) applyReqHeaders(req *http.Request, headers http.Header) {
 }
 
 func (c *Client) requestWithStats(req *http.Request, res *Response) (*http.Response, error) {
-	res.Stats = &RequestStats{}
+	res.Stats = &RequestStats{
+		Auth: c.getAuth(),
+	}
 	var dns, tlshs, connect time.Time
 	req = req.WithContext(
 		httptrace.WithClientTrace(
diff --git a/koios.go b/koios.go
index 980c8ee..e89a50b 100644
--- a/koios.go
+++ b/koios.go
@@ -48,7 +48,8 @@ const (
 	// DefaultOrigin is default origin header used by api client.
 	DefaultOrigin = "https://github.com/cardano-community/koios-go-client/v4"
 	// PageSize is default page size used by api client.
-	PageSize uint = 1000
+	PageSize       uint = 1000
+	DefaultTimeout      = 30 * time.Second
 )
 
 // Predefined errors used by the library.
@@ -76,6 +77,7 @@ var (
 	ErrClientLocked             = errors.New("client is locked")
 	ErrNoScriptHash             = errors.New("missing script hash(es)")
 	ErrNoUTxORef                = errors.New("missing UTxO reference(s)")
+	ErrAuth                     = errors.New("auth error")
 
 	// ZeroLovelace is alias decimal.Zero.
 	ZeroLovelace = decimal.Zero.Copy() //nolint: gochecknoglobals
@@ -158,6 +160,8 @@ type (
 
 		// ReqDurStr String representation of ReqDur.
 		ReqDurStr string `json:"req_dur_str,omitempty"`
+
+		Auth AuthInfo `json:"auth"`
 	}
 )
 
@@ -178,6 +182,7 @@ type (
 func New(opts ...Option) (*Client, error) {
 	c := &Client{
 		commonHeaders: make(http.Header),
+		auth:          &AuthInfo{},
 	}
 	// set default base url
 	_ = c.setBaseURL(DefaultScheme, MainnetHost, DefaultAPIVersion, DefaultPort)
diff --git a/options.go b/options.go
index 7d17a50..1eddb6c 100644
--- a/options.go
+++ b/options.go
@@ -82,7 +82,7 @@ func HTTPClient(client *http.Client) Option {
 			if c.locked {
 				return ErrClientLocked
 			}
-			timeout := time.Second * 60
+			timeout := DefaultTimeout
 			if client == nil {
 				client = &http.Client{}
 			}