diff --git a/bridge/setu/listener/rootchain_selfheal_graph.go b/bridge/setu/listener/rootchain_selfheal_graph.go
index 736f4bc99..43542c7f0 100644
--- a/bridge/setu/listener/rootchain_selfheal_graph.go
+++ b/bridge/setu/listener/rootchain_selfheal_graph.go
@@ -14,6 +14,8 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
 	jsoniter "github.com/json-iterator/go"
+
+	"github.com/maticnetwork/heimdall/helper"
 )
 
 // StakeUpdate represents the StakeUpdate event
@@ -42,6 +44,7 @@ type stateSyncResponse struct {
 	} `json:"data"`
 }
 
+// querySubGraph queries the subgraph and limits the read size
 func (rl *RootChainListener) querySubGraph(query []byte, ctx context.Context) (data []byte, err error) {
 	request, err := http.NewRequestWithContext(ctx, http.MethodPost, rl.subGraphClient.graphUrl, bytes.NewBuffer(query))
 	if err != nil {
@@ -56,7 +59,10 @@ func (rl *RootChainListener) querySubGraph(query []byte, ctx context.Context) (d
 	}
 	defer response.Body.Close()
 
-	return io.ReadAll(response.Body)
+	// Limit the number of bytes read from the response body
+	limitedBody := http.MaxBytesReader(nil, response.Body, helper.APIBodyLimit)
+
+	return io.ReadAll(limitedBody)
 }
 
 // getLatestStateID returns state ID from the latest StateSynced event
diff --git a/bridge/setu/processor/base.go b/bridge/setu/processor/base.go
index f33b4e357..5505463dc 100644
--- a/bridge/setu/processor/base.go
+++ b/bridge/setu/processor/base.go
@@ -162,12 +162,14 @@ func (bp *BaseProcessor) checkTxAgainstMempool(msg types.Msg, event interface{})
 		bp.Logger.Error("Error fetching mempool tx", "url", endpoint, "error", err)
 		return false, err
 	}
-
-	body, err := io.ReadAll(resp.Body)
 	defer resp.Body.Close()
 
+	// Limit the number of bytes read from the response body
+	limitedBody := http.MaxBytesReader(nil, resp.Body, helper.APIBodyLimit)
+
+	body, err := io.ReadAll(limitedBody)
 	if err != nil {
-		bp.Logger.Error("Error fetching mempool tx", "error", err)
+		bp.Logger.Error("Error reading response body for mempool tx", "error", err)
 		return false, err
 	}
 
diff --git a/bridge/setu/util/common.go b/bridge/setu/util/common.go
index d8173b004..12a4ae108 100644
--- a/bridge/setu/util/common.go
+++ b/bridge/setu/util/common.go
@@ -652,10 +652,12 @@ func GetUnconfirmedTxnCount(event interface{}) int {
 		logger.Error("Error fetching mempool txs count", "url", endpoint, "error", err)
 		return 0
 	}
-
-	body, err := io.ReadAll(resp.Body)
 	defer resp.Body.Close()
 
+	// Limit the number of bytes read from the response body
+	limitedBody := http.MaxBytesReader(nil, resp.Body, helper.APIBodyLimit)
+
+	body, err := io.ReadAll(limitedBody)
 	if err != nil {
 		logger.Error("Error fetching mempool txs count", "error", err)
 		return 0
diff --git a/helper/call.go b/helper/call.go
index dca52bece..75424a496 100644
--- a/helper/call.go
+++ b/helper/call.go
@@ -310,10 +310,10 @@ func (c *ContractCaller) GetRootHash(start uint64, end uint64, checkpointLength
 	return common.FromHex(rootHash), nil
 }
 
-// GetRootHash get root hash from bor chain
+// GetVoteOnHash gets vote on hash from bor chain
 func (c *ContractCaller) GetVoteOnHash(start uint64, end uint64, milestoneLength uint64, hash string, milestoneID string) (bool, error) {
 	if start > end {
-		return false, errors.New("Start block number is greater than the end block number")
+		return false, errors.New("start block number is greater than the end block number")
 	}
 
 	ctx, cancel := context.WithTimeout(context.Background(), c.MaticChainTimeout)
@@ -368,7 +368,7 @@ func (c *ContractCaller) GetValidatorInfo(valID types.ValidatorID, stakingInfoIn
 	// amount, startEpoch, endEpoch, signer, status, err := c.StakingInfoInstance.GetStakerDetails(nil, big.NewInt(int64(valID)))
 	stakerDetails, err := stakingInfoInstance.GetStakerDetails(nil, big.NewInt(int64(valID)))
 	if err != nil {
-		Logger.Error("Error fetching validator information from stake manager", "validatorId", valID, "status", stakerDetails.Status, "error", err)
+		Logger.Error("Error fetching validator information from stake manager", "validatorId", valID, "error", err)
 		return
 	}
 
@@ -814,6 +814,9 @@ func (c *ContractCaller) GetSpanDetails(id *big.Int, validatorSetInstance *valid
 	error,
 ) {
 	d, err := validatorSetInstance.GetSpan(nil, id)
+	if err != nil {
+		return nil, nil, nil, err
+	}
 	return d.Number, d.StartBlock, d.EndBlock, err
 }
 
diff --git a/helper/util.go b/helper/util.go
index e3f41956e..5e17674d7 100644
--- a/helper/util.go
+++ b/helper/util.go
@@ -42,6 +42,8 @@ import (
 	"github.com/maticnetwork/heimdall/types/rest"
 )
 
+const APIBodyLimit = 128 * 1024 * 1024 // 128 MB
+
 //go:generate mockgen -destination=./mocks/http_client_mock.go -package=mocks . HTTPClient
 type HTTPClient interface {
 	Get(string) (resp *http.Response, err error)
@@ -567,10 +569,19 @@ func SignStdTx(cliCtx context.CLIContext, stdTx authTypes.StdTx, appendSig bool,
 // ReadStdTxFromFile and decode a StdTx from the given filename.  Can pass "-" to read from stdin.
 func ReadStdTxFromFile(cdc *amino.Codec, filename string) (stdTx authTypes.StdTx, err error) {
 	var bytes []byte
+
 	if filename == "-" {
-		bytes, err = io.ReadAll(os.Stdin)
+		limitedReader := &io.LimitedReader{R: os.Stdin, N: APIBodyLimit}
+		bytes, err = io.ReadAll(limitedReader)
 	} else {
-		bytes, err = os.ReadFile(filename)
+		file, er := os.Open(filename)
+		if er != nil {
+			err = er
+			return
+		}
+		defer file.Close()
+		limitedReader := &io.LimitedReader{R: file, N: APIBodyLimit}
+		bytes, err = io.ReadAll(limitedReader)
 	}
 
 	if err != nil {
@@ -802,7 +813,7 @@ func GetHeimdallServerEndpoint(endpoint string) string {
 	return u.String()
 }
 
-// FetchFromAPI fetches data from any URL
+// FetchFromAPI fetches data from any URL with limited read size
 func FetchFromAPI(cliCtx cliContext.CLIContext, URL string) (result rest.ResponseWithHeight, err error) {
 	resp, err := Client.Get(URL)
 	if err != nil {
@@ -811,9 +822,12 @@ func FetchFromAPI(cliCtx cliContext.CLIContext, URL string) (result rest.Respons
 
 	defer resp.Body.Close()
 
-	// response
+	// Limit the number of bytes read from the response body
+	limitedBody := http.MaxBytesReader(nil, resp.Body, APIBodyLimit)
+
+	// Handle the response
 	if resp.StatusCode == 200 {
-		body, err := io.ReadAll(resp.Body)
+		body, err := io.ReadAll(limitedBody)
 		if err != nil {
 			return result, err
 		}
diff --git a/types/rest/rest.go b/types/rest/rest.go
index 622e743cb..92f1cfe9e 100644
--- a/types/rest/rest.go
+++ b/types/rest/rest.go
@@ -23,7 +23,8 @@ import (
 
 const (
 	DefaultPage  = 1
-	DefaultLimit = 30 // should be consistent with tendermint/tendermint/rpc/core/pipe.go:19
+	DefaultLimit = 30                // should be consistent with tendermint/tendermint/rpc/core/pipe.go:19
+	APIBodyLimit = 128 * 1024 * 1024 // 128 MB
 )
 
 var (
@@ -128,7 +129,10 @@ func (br BaseReq) ValidateBasic(w http.ResponseWriter) bool {
 // ReadRESTReq reads and unmarshals a Request's body to the BaseReq struct.
 // Writes an error response to ResponseWriter and returns true if errors occurred.
 func ReadRESTReq(w http.ResponseWriter, r *http.Request, cdc *codec.Codec, req interface{}) bool {
-	body, err := io.ReadAll(r.Body)
+	// Limit the number of bytes read from the request body
+	limitedBody := http.MaxBytesReader(w, r.Body, APIBodyLimit)
+
+	body, err := io.ReadAll(limitedBody)
 	if err != nil {
 		WriteErrorResponse(w, http.StatusBadRequest, err.Error())
 		return false