diff --git a/relayer/proto/relayer.gen.go b/relayer/proto/relayer.gen.go
index ad65f313..8dc3cf19 100644
--- a/relayer/proto/relayer.gen.go
+++ b/relayer/proto/relayer.gen.go
@@ -1,4 +1,4 @@
-// sequence-relayer v0.4.0 59a862f763edcaca2fb2e11901b24873c4c02034
+// sequence-relayer v0.4.0 e870aab3d2d1c607ee9142f897e79e8e659b4348
 // --
 // This file has been generated by https://github.com/webrpc/webrpc using gen/golang
 // Do not edit by hand. Update your webrpc schema and re-generate.
@@ -31,7 +31,7 @@ func WebRPCSchemaVersion() string {
 
 // Schema hash generated from your RIDL schema
 func WebRPCSchemaHash() string {
-	return "59a862f763edcaca2fb2e11901b24873c4c02034"
+	return "e870aab3d2d1c607ee9142f897e79e8e659b4348"
 }
 
 //
@@ -280,6 +280,7 @@ type MetaTxnLog struct {
 	MetaTxnID       *string                `json:"metaTxnID" db:"meta_txn_id"`
 	TxnStatus       ETHTxnStatus           `json:"txnStatus" db:"txn_status"`
 	TxnRevertReason string                 `json:"txnRevertReason" db:"txn_revert_reason"`
+	Requeues        uint                   `json:"requeues" db:"requeues"`
 	Target          prototyp.Hash          `json:"target" db:"target"`
 	Input           prototyp.Hash          `json:"input" db:"input"`
 	TxnArgs         map[string]interface{} `json:"txnArgs" db:"txn_args"`
@@ -348,6 +349,15 @@ type SentTransactionsFilter struct {
 	Failed  *bool `json:"failed"`
 }
 
+type SimulateResult struct {
+	Executed  bool    `json:"executed"`
+	Succeeded bool    `json:"succeeded"`
+	Result    *string `json:"result"`
+	Reason    *string `json:"reason"`
+	GasUsed   uint    `json:"gasUsed"`
+	GasLimit  uint    `json:"gasLimit"`
+}
+
 type FeeOption struct {
 	Token    *FeeToken `json:"token"`
 	To       string    `json:"to"`
@@ -391,7 +401,7 @@ type Relayer interface {
 	SendMetaTxn(ctx context.Context, call *MetaTxn) (bool, string, error)
 	GetMetaTxnNonce(ctx context.Context, walletContractAddress string, space *string) (string, error)
 	GetMetaTxnReceipt(ctx context.Context, metaTxID string) (*MetaTxnReceipt, error)
-	UpdateMetaTxnGasLimits(ctx context.Context, walletAddress string, walletConfig *WalletConfig, payload string) (string, error)
+	Simulate(ctx context.Context, wallet string, transactions string) ([]*SimulateResult, error)
 	FeeTokens(ctx context.Context) (bool, []*FeeToken, error)
 	GetMetaTxnNetworkFeeOptions(ctx context.Context, walletConfig *WalletConfig, payload string) ([]*FeeOption, error)
 	SentTransactions(ctx context.Context, filter *SentTransactionsFilter, page *Page) (*Page, []*Transaction, error)
@@ -408,7 +418,7 @@ var WebRPCServices = map[string][]string{
 		"SendMetaTxn",
 		"GetMetaTxnNonce",
 		"GetMetaTxnReceipt",
-		"UpdateMetaTxnGasLimits",
+		"Simulate",
 		"FeeTokens",
 		"GetMetaTxnNetworkFeeOptions",
 		"SentTransactions",
@@ -438,7 +448,7 @@ func NewRelayerClient(addr string, client HTTPClient) Relayer {
 		prefix + "SendMetaTxn",
 		prefix + "GetMetaTxnNonce",
 		prefix + "GetMetaTxnReceipt",
-		prefix + "UpdateMetaTxnGasLimits",
+		prefix + "Simulate",
 		prefix + "FeeTokens",
 		prefix + "GetMetaTxnNetworkFeeOptions",
 		prefix + "SentTransactions",
@@ -533,14 +543,13 @@ func (c *relayerClient) GetMetaTxnReceipt(ctx context.Context, metaTxID string)
 	return out.Ret0, err
 }
 
-func (c *relayerClient) UpdateMetaTxnGasLimits(ctx context.Context, walletAddress string, walletConfig *WalletConfig, payload string) (string, error) {
+func (c *relayerClient) Simulate(ctx context.Context, wallet string, transactions string) ([]*SimulateResult, error) {
 	in := struct {
-		Arg0 string        `json:"walletAddress"`
-		Arg1 *WalletConfig `json:"walletConfig"`
-		Arg2 string        `json:"payload"`
-	}{walletAddress, walletConfig, payload}
+		Arg0 string `json:"wallet"`
+		Arg1 string `json:"transactions"`
+	}{wallet, transactions}
 	out := struct {
-		Ret0 string `json:"payload"`
+		Ret0 []*SimulateResult `json:"results"`
 	}{}
 
 	err := doJSONRequest(ctx, c.client, c.urls[8], in, &out)
diff --git a/relayer/rpc_relayer.go b/relayer/rpc_relayer.go
index 16e91732..3522b19d 100644
--- a/relayer/rpc_relayer.go
+++ b/relayer/rpc_relayer.go
@@ -52,22 +52,17 @@ func (r *RpcRelayer) EstimateGasLimits(ctx context.Context, walletConfig sequenc
 		return nil, err
 	}
 
-	config, err := r.protoConfig(ctx, &walletConfig, walletAddress)
+	response, err := r.Service.Simulate(ctx, walletAddress.Hex(), hexutil.Encode(requestData))
 	if err != nil {
 		return nil, err
 	}
 
-	response, err := r.Service.UpdateMetaTxnGasLimits(ctx, walletAddress.Hex(), config, hexutil.Encode(requestData))
-	if err != nil {
-		return nil, err
-	}
-
-	responseData, err := hexutil.Decode(response)
-	if err != nil {
-		return nil, err
+	txns = txns.Clone()
+	for i, txn := range txns {
+		txn.GasLimit = big.NewInt(int64(response[i].GasLimit))
 	}
 
-	return sequence.DecodeRawTransactions(responseData)
+	return txns, nil
 }
 
 // NOTE: nonce space is 160 bits wide