cosmos
diff --git a/‎CHANGELOG.md‎
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diff --git a/‎config/server_app_options.go‎
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diff --git a/‎docs/migrations/v0.4.0_to_v0.5.0_UNRELEASED.md‎
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diff --git a/‎evmd/app.go‎
Lines changed: 3 additions & 23 deletions b/‎evmd/app.go‎
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diff --git a/‎evmd/mempool.go‎
Lines changed: 65 additions & 0 deletions b/‎evmd/mempool.go‎
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diff --git a/‎mempool/mempool.go‎
Lines changed: 12 additions & 1 deletion b/‎mempool/mempool.go‎
Lines changed: 12 additions & 1 deletion
@@ -25,6 +25,7 @@
 
 ### IMPROVEMENTS
 
+- [\#698](https://github.com/cosmos/evm/pull/698) Expose mempool configuration flags and move mempool configuration in app.go to helper
 - [\#538](https://github.com/cosmos/evm/pull/538) Optimize `eth_estimateGas` gRPC path: short-circuit plain transfers, add optimistic gas bound based on `MaxUsedGas`.
 - [\#513](https://github.com/cosmos/evm/pull/513) Replace `TestEncodingConfig` with production `EncodingConfig` in encoding package to remove test dependencies from production code.
 - [\#467](https://github.com/cosmos/evm/pull/467) Replace GlobalEVMMempool by passing to JSONRPC on initiate.
 
@@ -7,6 +7,7 @@ import (
 	"github.com/holiman/uint256"
 	"github.com/spf13/cast"
 
+	"github.com/cosmos/evm/mempool/txpool/legacypool"
 	srvflags "github.com/cosmos/evm/server/flags"
 
 	"cosmossdk.io/log"
@@ -21,6 +22,11 @@ import (
 // GetBlockGasLimit reads the genesis json file using AppGenesisFromFile
 // to extract the consensus block gas limit before InitChain is called.
 func GetBlockGasLimit(appOpts servertypes.AppOptions, logger log.Logger) uint64 {
+	if appOpts == nil {
+		logger.Error("app options is nil, using zero block gas limit")
+		return math.MaxUint64
+	}
+
 	homeDir := cast.ToString(appOpts.Get(flags.FlagHome))
 	if homeDir == "" {
 		logger.Error("home directory not found in app options, using zero block gas limit")
@@ -69,6 +75,11 @@ func GetBlockGasLimit(appOpts servertypes.AppOptions, logger log.Logger) uint64
 // This is currently not used, but is kept in case this is useful for the mempool,
 // in addition to the min tip flag
 func GetMinGasPrices(appOpts servertypes.AppOptions, logger log.Logger) sdk.DecCoins {
+	if appOpts == nil {
+		logger.Error("app options is nil, using empty DecCoins")
+		return sdk.DecCoins{}
+	}
+
 	minGasPricesStr := cast.ToString(appOpts.Get(sdkserver.FlagMinGasPrices))
 	minGasPrices, err := sdk.ParseDecCoins(minGasPricesStr)
 	if err != nil {
@@ -82,6 +93,11 @@ func GetMinGasPrices(appOpts servertypes.AppOptions, logger log.Logger) sdk.DecC
 // GetMinTip reads the min tip from the app options, set from app.toml
 // This field is also known as the minimum priority fee
 func GetMinTip(appOpts servertypes.AppOptions, logger log.Logger) *uint256.Int {
+	if appOpts == nil {
+		logger.Error("app options is nil, using zero min tip")
+		return nil
+	}
+
 	minTipUint64 := cast.ToUint64(appOpts.Get(srvflags.EVMMinTip))
 	minTip := uint256.NewInt(minTipUint64)
 
@@ -92,3 +108,46 @@ func GetMinTip(appOpts servertypes.AppOptions, logger log.Logger) *uint256.Int {
 	logger.Error("invalid min tip value in app.toml or flag, falling back to nil", "min_tip", minTipUint64)
 	return nil
 }
+
+// GetLegacyPoolConfig reads the legacy pool configuration from appOpts and overrides
+// default values with values from app.toml if they exist and are non-zero.
+func GetLegacyPoolConfig(appOpts servertypes.AppOptions, logger log.Logger) *legacypool.Config {
+	if appOpts == nil {
+		logger.Error("app options is nil, using default mempool config")
+		return &legacypool.DefaultConfig
+	}
+
+	legacyConfig := legacypool.DefaultConfig
+	if priceLimit := cast.ToUint64(appOpts.Get(srvflags.EVMMempoolPriceLimit)); priceLimit != 0 {
+		legacyConfig.PriceLimit = priceLimit
+	}
+	if priceBump := cast.ToUint64(appOpts.Get(srvflags.EVMMempoolPriceBump)); priceBump != 0 {
+		legacyConfig.PriceBump = priceBump
+	}
+	if accountSlots := cast.ToUint64(appOpts.Get(srvflags.EVMMempoolAccountSlots)); accountSlots != 0 {
+		legacyConfig.AccountSlots = accountSlots
+	}
+	if globalSlots := cast.ToUint64(appOpts.Get(srvflags.EVMMempoolGlobalSlots)); globalSlots != 0 {
+		legacyConfig.GlobalSlots = globalSlots
+	}
+	if accountQueue := cast.ToUint64(appOpts.Get(srvflags.EVMMempoolAccountQueue)); accountQueue != 0 {
+		legacyConfig.AccountQueue = accountQueue
+	}
+	if globalQueue := cast.ToUint64(appOpts.Get(srvflags.EVMMempoolGlobalQueue)); globalQueue != 0 {
+		legacyConfig.GlobalQueue = globalQueue
+	}
+	if lifetime := cast.ToDuration(appOpts.Get(srvflags.EVMMempoolLifetime)); lifetime != 0 {
+		legacyConfig.Lifetime = lifetime
+	}
+
+	return &legacyConfig
+}
+
+func GetCosmosPoolMaxTx(appOpts servertypes.AppOptions, logger log.Logger) int {
+	if appOpts == nil {
+		logger.Error("app options is nil, using default cosmos pool max tx of -1 (no-op)")
+		return 0
+	}
+
+	return cast.ToInt(appOpts.Get(sdkserver.FlagMempoolMaxTxs))
+}
@@ -135,6 +135,79 @@ mempoolConfig.CosmosPoolConfig = &cosmosCfg
 mempoolConfig.BroadCastTxFn = func(txs []*ethtypes.Transaction) error { return nil }
 ```
 
+#### New Configuration Options
+
+PR [#698](https://github.com/cosmos/evm/pull/698) adds new configuration options for the EVM mempool that can be set via `app.toml` or CLI flags. These options allow fine-tuning of the EVM legacy pool behavior.
+
+##### Configuration via `app.toml`
+
+The following mempool configuration options are now available in `app.toml` under the `[evm.mempool]` section:
+
+```toml
+[evm.mempool]
+# PriceLimit is the minimum gas price to enforce for acceptance into the pool (in wei)
+price-limit = 1
+
+# PriceBump is the minimum price bump percentage to replace an already existing transaction (nonce)
+price-bump = 10
+
+# AccountSlots is the number of executable transaction slots guaranteed per account
+account-slots = 16
+
+# GlobalSlots is the maximum number of executable transaction slots for all accounts
+global-slots = 5120
+
+# AccountQueue is the maximum number of non-executable transaction slots permitted per account
+account-queue = 64
+
+# GlobalQueue is the maximum number of non-executable transaction slots for all accounts
+global-queue = 1024
+
+# Lifetime is the maximum amount of time non-executable transaction are queued
+lifetime = "3h0m0s"
+```
+
+##### Configuration via CLI Flags
+
+These options can also be set via CLI flags:
+
+- `--evm.mempool.price-limit` (default: 1)
+- `--evm.mempool.price-bump` (default: 10)
+- `--evm.mempool.account-slots` (default: 16)
+- `--evm.mempool.global-slots` (default: 5120)
+- `--evm.mempool.account-queue` (default: 64)
+- `--evm.mempool.global-queue` (default: 1024)
+- `--evm.mempool.lifetime` (default: 3h0m0s)
+
+##### Cosmos Mempool Max Transactions
+
+A new flag `--mempool.max-txs` allows limiting the maximum number of transactions in the Cosmos mempool. Set to 0 or -1 for unbounded (default: 0).
+
+##### Simplified Mempool Setup
+
+The mempool configuration can now be handled by a helper function. If you prefer to use the configuration from `app.toml` and CLI flags, you can refactor your mempool setup:
+
+```go
+// Before: Manual configuration in app.go
+mempoolConfig := &evmmempool.EVMMempoolConfig{
+    AnteHandler:   app.GetAnteHandler(),
+    BlockGasLimit: blockGasLimit,
+    MinTip:        minTip,
+}
+evmMempool := evmmempool.NewExperimentalEVMMempool(
+    app.CreateQueryContext, logger, app.EVMKeeper, app.FeeMarketKeeper,
+    app.txConfig, app.clientCtx, mempoolConfig,
+)
+
+// After: Using helper function (optional)
+// See evmd/mempool.go for reference implementation
+if err := app.configureEVMMempool(appOpts, logger); err != nil {
+    panic(fmt.Sprintf("failed to configure EVM mempool: %s", err.Error()))
+}
+```
+
+The helper function reads configuration from `appOpts` and applies defaults where needed. Note that `NewExperimentalEVMMempool` now takes an additional `cosmosPoolMaxTx` parameter.
+
 ### Default Precompiles
 
 Default precompiles have been moved to `/evm/precompiles/types/defaults.go` and the function name was
@@ -175,6 +248,18 @@ and moves them to state or genesis.
 It is critical to remove any use of EvmAppOptions as calling the configurator will panic the chain
 at runtime during startup.
 
+#### EVM Chain ID
+
+The EVM chain ID is now retrieved directly from `appOpts` instead of being passed as a parameter. In `app.go`, the chain ID is obtained using:
+
+```go
+evmChainID := cast.ToUint64(appOpts.Get(srvflags.EVMChainID))
+```
+
+See `evmd/app.go:216` for the reference implementation.
+
+#### Function Signature Changes
+
 In `app.go`, remove evmChainID and evmAppOptions from the NewApp signature.
 
 ```diff
 
@@ -717,29 +717,9 @@ func NewExampleApp(
 	app.setAnteHandler(app.txConfig, maxGasWanted)
 
 	// set the EVM priority nonce mempool
-	// If you wish to use the noop mempool, remove this codeblock
-	if evmtypes.GetChainConfig() != nil {
-		// Get the block gas limit from genesis file
-		blockGasLimit := evmconfig.GetBlockGasLimit(appOpts, logger)
-		// Get GetMinTip from app.toml or cli flag configuration
-		mipTip := evmconfig.GetMinTip(appOpts, logger)
-
-		mempoolConfig := &evmmempool.EVMMempoolConfig{
-			AnteHandler:   app.GetAnteHandler(),
-			BlockGasLimit: blockGasLimit,
-			MinTip:        mipTip,
-		}
-
-		evmMempool := evmmempool.NewExperimentalEVMMempool(app.CreateQueryContext, logger, app.EVMKeeper, app.FeeMarketKeeper, app.txConfig, app.clientCtx, mempoolConfig)
-		app.EVMMempool = evmMempool
-
-		app.SetMempool(evmMempool)
-		checkTxHandler := evmmempool.NewCheckTxHandler(evmMempool)
-		app.SetCheckTxHandler(checkTxHandler)
-
-		abciProposalHandler := baseapp.NewDefaultProposalHandler(evmMempool, app)
-		abciProposalHandler.SetSignerExtractionAdapter(evmmempool.NewEthSignerExtractionAdapter(sdkmempool.NewDefaultSignerExtractionAdapter()))
-		app.SetPrepareProposal(abciProposalHandler.PrepareProposalHandler())
+	// if you wish to use the noop mempool, remove this codeblock
+	if err := app.configureEVMMempool(appOpts, logger); err != nil {
+		panic(fmt.Sprintf("failed to configure EVM mempool: %s", err.Error()))
 	}
 
 	// In v0.46, the SDK introduces _postHandlers_. PostHandlers are like
 
@@ -0,0 +1,65 @@
+package evmd
+
+import (
+	"fmt"
+
+	"cosmossdk.io/log"
+
+	"github.com/cosmos/cosmos-sdk/baseapp"
+	servertypes "github.com/cosmos/cosmos-sdk/server/types"
+	sdkmempool "github.com/cosmos/cosmos-sdk/types/mempool"
+
+	evmconfig "github.com/cosmos/evm/config"
+	evmmempool "github.com/cosmos/evm/mempool"
+	evmtypes "github.com/cosmos/evm/x/vm/types"
+)
+
+// configureEVMMempool sets up the EVM mempool and related handlers using viper configuration.
+func (app *EVMD) configureEVMMempool(appOpts servertypes.AppOptions, logger log.Logger) error {
+	if evmtypes.GetChainConfig() == nil {
+		logger.Debug("evm chain config is not set, skipping mempool configuration")
+		return nil
+	}
+
+	mempoolConfig, err := app.createMempoolConfig(appOpts, logger)
+	if err != nil {
+		return fmt.Errorf("failed to get mempool config: %w", err)
+	}
+	cosmosPoolMaxTx := evmconfig.GetCosmosPoolMaxTx(appOpts, logger)
+
+	evmMempool := evmmempool.NewExperimentalEVMMempool(
+		app.CreateQueryContext,
+		logger,
+		app.EVMKeeper,
+		app.FeeMarketKeeper,
+		app.txConfig,
+		app.clientCtx,
+		mempoolConfig,
+		cosmosPoolMaxTx,
+	)
+	app.EVMMempool = evmMempool
+	app.SetMempool(evmMempool)
+	checkTxHandler := evmmempool.NewCheckTxHandler(evmMempool)
+	app.SetCheckTxHandler(checkTxHandler)
+
+	abciProposalHandler := baseapp.NewDefaultProposalHandler(evmMempool, app)
+	abciProposalHandler.SetSignerExtractionAdapter(
+		evmmempool.NewEthSignerExtractionAdapter(
+			sdkmempool.NewDefaultSignerExtractionAdapter(),
+		),
+	)
+	app.SetPrepareProposal(abciProposalHandler.PrepareProposalHandler())
+
+	return nil
+}
+
+// createMempoolConfig creates a new EVMMempoolConfig with the default configuration
+// and overrides it with values from appOpts if they exist and are non-zero.
+func (app *EVMD) createMempoolConfig(appOpts servertypes.AppOptions, logger log.Logger) (*evmmempool.EVMMempoolConfig, error) {
+	return &evmmempool.EVMMempoolConfig{
+		AnteHandler:      app.GetAnteHandler(),
+		LegacyPoolConfig: evmconfig.GetLegacyPoolConfig(appOpts, logger),
+		BlockGasLimit:    evmconfig.GetBlockGasLimit(appOpts, logger),
+		MinTip:           evmconfig.GetMinTip(appOpts, logger),
+	}, nil
+}
@@ -82,7 +82,16 @@ type EVMMempoolConfig struct {
 // It initializes both EVM and Cosmos transaction pools, sets up blockchain interfaces,
 // and configures fee-based prioritization. The config parameter allows customization
 // of pools and verification functions, with sensible defaults created if not provided.
-func NewExperimentalEVMMempool(getCtxCallback func(height int64, prove bool) (sdk.Context, error), logger log.Logger, vmKeeper VMKeeperI, feeMarketKeeper FeeMarketKeeperI, txConfig client.TxConfig, clientCtx client.Context, config *EVMMempoolConfig) *ExperimentalEVMMempool {
+func NewExperimentalEVMMempool(
+	getCtxCallback func(height int64, prove bool) (sdk.Context, error),
+	logger log.Logger,
+	vmKeeper VMKeeperI,
+	feeMarketKeeper FeeMarketKeeperI,
+	txConfig client.TxConfig,
+	clientCtx client.Context,
+	config *EVMMempoolConfig,
+	cosmosPoolMaxTx int,
+) *ExperimentalEVMMempool {
 	var (
 		cosmosPool sdkmempool.ExtMempool
 		blockchain *Blockchain
@@ -137,6 +146,7 @@ func NewExperimentalEVMMempool(getCtxCallback func(height int64, prove bool) (sd
 		panic("tx pool should contain only legacypool")
 	}
 
+	// TODO: move this logic to evmd.createMempoolConfig and set the max tx there
 	// Create Cosmos Mempool from configuration
 	cosmosPoolConfig := config.CosmosPoolConfig
 	if cosmosPoolConfig == nil {
@@ -166,6 +176,7 @@ func NewExperimentalEVMMempool(getCtxCallback func(height int64, prove bool) (sd
 		cosmosPoolConfig = &defaultConfig
 	}
 
+	cosmosPoolConfig.MaxTx = cosmosPoolMaxTx
 	cosmosPool = sdkmempool.NewPriorityMempool(*cosmosPoolConfig)
 
 	evmMempool := &ExperimentalEVMMempool{