diff --git a/captcha.go b/captcha.go
new file mode 100644
index 0000000..70c0636
--- /dev/null
+++ b/captcha.go
@@ -0,0 +1,13 @@
+package contracts
+
+import (
+	"net/http"
+
+	"github.com/samber/do"
+)
+
+type Captcha interface {
+	Middleware(container *do.Injector) func(next http.Handler) http.Handler
+	Verify(id, answer string, clear bool) bool
+	Generate(captchaUuid string) (id, answer string)
+}