diff --git a/affected_earthquake.go b/affected_earthquake.go
index 3bb519a..7bf197d 100644
--- a/affected_earthquake.go
+++ b/affected_earthquake.go
@@ -3,6 +3,7 @@ package gempago
 import (
 	"encoding/json"
 	"errors"
+	"fmt"
 	"io"
 	"net/http"
 	"strconv"
@@ -10,8 +11,10 @@ import (
 	"time"
 )
 
+// TODO add exponential backoff algorithm
+
 func AffectedEarthQuake() ([]*EarthQuakeData, error) {
-	req, err := http.NewRequest(http.MethodGet, "https://data.bmkg.go.id/DataMKG/TEWS/gempadirasakan.json", nil)
+	req, err := http.NewRequest(http.MethodGet, fmt.Sprintf("%s/gempadirasakan.json", _BMKG), nil)
 	if err != nil {
 		return nil, err
 	}
diff --git a/const.go b/const.go
new file mode 100644
index 0000000..e4a41f9
--- /dev/null
+++ b/const.go
@@ -0,0 +1,6 @@
+package gempago
+
+const (
+	_BMKG = "https://data.bmkg.go.id/DataMKG/TEWS"
+	_USGS = ""
+)
diff --git a/http_wrapper.go b/http_wrapper.go
new file mode 100644
index 0000000..728d23f
--- /dev/null
+++ b/http_wrapper.go
@@ -0,0 +1 @@
+package gempago
diff --git a/latest_earthquake.go b/latest_earthquake.go
index 75e4c14..257ebaa 100644
--- a/latest_earthquake.go
+++ b/latest_earthquake.go
@@ -12,7 +12,7 @@ import (
 )
 
 func LatestEarthQuake() (*EarthQuakeData, error) {
-	req, err := http.NewRequest(http.MethodGet, "https://data.bmkg.go.id/DataMKG/TEWS/autogempa.json", nil)
+	req, err := http.NewRequest(http.MethodGet, fmt.Sprintf("%s/autogempa.json", _BMKG), nil)
 	if err != nil {
 		return nil, err
 	}
@@ -79,7 +79,7 @@ func LatestEarthQuake() (*EarthQuakeData, error) {
 	earthQuakeData.Potential = data.InfoGempa.Gempa.Potensi
 	earthQuakeData.AffectedRegion = data.InfoGempa.Gempa.Dirasakan
 
-	earthQuakeData.Shakemap = fmt.Sprintf("https://data.bmkg.go.id/DataMKG/TEWS/%s", data.InfoGempa.Gempa.Shakemap)
+	earthQuakeData.Shakemap = fmt.Sprintf("%s/%s", _BMKG, data.InfoGempa.Gempa.Shakemap)
 
 	return &earthQuakeData, nil
 }
diff --git a/recents_earthquake.go b/recents_earthquake.go
index 12ab5e5..347e488 100644
--- a/recents_earthquake.go
+++ b/recents_earthquake.go
@@ -3,6 +3,7 @@ package gempago
 import (
 	"encoding/json"
 	"errors"
+	"fmt"
 	"io"
 	"net/http"
 	"strconv"
@@ -11,7 +12,7 @@ import (
 )
 
 func RecentsEarthQuake() ([]*EarthQuakeData, error) {
-	req, err := http.NewRequest(http.MethodGet, "https://data.bmkg.go.id/DataMKG/TEWS/gempaterkini.json", nil)
+	req, err := http.NewRequest(http.MethodGet, fmt.Sprintf("%s/gempaterkini.json", _BMKG), nil)
 	if err != nil {
 		return nil, err
 	}