diff --git a/internal/service/api/handlers/get_gist_data.go b/internal/service/api/handlers/get_gist_data.go
index 1d8a0bc..2e003c8 100644
--- a/internal/service/api/handlers/get_gist_data.go
+++ b/internal/service/api/handlers/get_gist_data.go
@@ -27,7 +27,7 @@ func GetGistData(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	gistProof, err := StateContract(r).GetGISTProofByRoot(&bind.CallOpts{}, req.StateRoot, userID.BigInt())
+	gistProof, err := StateContract(r).GetGISTProofByRoot(&bind.CallOpts{}, userID.BigInt(), req.StateRoot)
 	if err != nil {
 		Log(r).WithError(err).Error("failed to get GIST proof")
 		ape.RenderErr(w, problems.InternalError())