diff --git a/sei-cosmos/types/dec_coin.go b/sei-cosmos/types/dec_coin.go
index 6997c019cb..1b8f468b81 100644
--- a/sei-cosmos/types/dec_coin.go
+++ b/sei-cosmos/types/dec_coin.go
@@ -179,16 +179,18 @@ func sanitizeDecCoins(decCoins []DecCoin) DecCoins {
 	return newDecCoins.Sort()
 }
 
-// NewDecCoinsFromCoins constructs a new coin set with decimal values
-// from regular Coins.
-func NewDecCoinsFromCoins(coins ...Coin) DecCoins {
-	decCoins := make(DecCoins, len(coins))
+// NewDecCoinsFromCoins constructs DecCoins from Coins, or an error if any
+// amount exceeds the decimal conversion range.
+func NewDecCoinsFromCoins(coins ...Coin) (DecCoins, error) {
 	newCoins := NewCoins(coins...)
+	decCoins := make(DecCoins, len(newCoins))
 	for i, coin := range newCoins {
+		if !coin.Amount.CanConvertToDec() {
+			return nil, fmt.Errorf("coin %s amount exceeds decimal conversion range", coin)
+		}
 		decCoins[i] = NewDecCoinFromCoin(coin)
 	}
-
-	return decCoins
+	return decCoins, nil
 }
 
 // String implements the Stringer interface for DecCoins. It returns a
diff --git a/sei-cosmos/types/dec_coin_test.go b/sei-cosmos/types/dec_coin_test.go
index 1159b174bd..f630830df6 100644
--- a/sei-cosmos/types/dec_coin_test.go
+++ b/sei-cosmos/types/dec_coin_test.go
@@ -1,6 +1,7 @@
 package types_test
 
 import (
+	"math/big"
 	"strings"
 	"testing"
 
@@ -18,7 +19,26 @@ import (
 func TestNewDecCoinConversionRange(t *testing.T) {
 	require.Panics(t, func() { sdk.NewDecCoin("stake", maxInt()) }, "NewDecCoin must reject max Int")
 	require.Panics(t, func() { sdk.NewDecCoinFromCoin(sdk.NewCoin("stake", maxInt())) }, "NewDecCoinFromCoin must reject max Int")
-	require.Panics(t, func() { sdk.NewDecCoinsFromCoins(sdk.NewCoin("stake", maxInt())) }, "NewDecCoinsFromCoins must reject max Int")
+
+	require.False(t, sdk.Int{}.CanConvertToDec())
+	require.False(t, maxInt().CanConvertToDec())
+	_, err := sdk.NewDecCoinsFromCoins(sdk.NewCoin("stake", maxInt()))
+	require.Error(t, err)
+
+	// Largest Int whose whole-coin Dec stays within maxDecBitLen (315):
+	// floor((2^315 - 1) / 10^18).
+	ten18 := new(big.Int).Exp(big.NewInt(10), big.NewInt(18), nil)
+	maxScaled := new(big.Int).Sub(new(big.Int).Lsh(big.NewInt(1), 315), big.NewInt(1))
+	maxConvertible := sdk.NewIntFromBigInt(new(big.Int).Quo(maxScaled, ten18))
+	require.True(t, maxConvertible.CanConvertToDec())
+	decCoins, err := sdk.NewDecCoinsFromCoins(sdk.NewCoin("stake", maxConvertible))
+	require.NoError(t, err)
+	require.Equal(t, maxConvertible.ToDec(), decCoins[0].Amount)
+
+	oneAbove := maxConvertible.Add(sdk.OneInt())
+	require.False(t, oneAbove.CanConvertToDec())
+	_, err = sdk.NewDecCoinsFromCoins(sdk.NewCoin("stake", oneAbove))
+	require.Error(t, err)
 }
 
 type decCoinTestSuite struct {
@@ -293,7 +313,7 @@ func (s *decCoinTestSuite) TestSubDecCoins() {
 		msg        string
 	}{
 		{
-			sdk.NewDecCoinsFromCoins(sdk.NewCoin("mytoken", sdk.NewInt(10)), sdk.NewCoin("btc", sdk.NewInt(20)), sdk.NewCoin("eth", sdk.NewInt(30))),
+			sdk.NewDecCoins(sdk.NewDecCoin("mytoken", sdk.NewInt(10)), sdk.NewDecCoin("btc", sdk.NewInt(20)), sdk.NewDecCoin("eth", sdk.NewInt(30))),
 			true,
 			"sorted coins should have passed",
 		},
@@ -309,7 +329,8 @@ func (s *decCoinTestSuite) TestSubDecCoins() {
 		},
 	}
 
-	decCoins := sdk.NewDecCoinsFromCoins(sdk.NewCoin("btc", sdk.NewInt(10)), sdk.NewCoin("eth", sdk.NewInt(15)), sdk.NewCoin("mytoken", sdk.NewInt(5)))
+	decCoins, err := sdk.NewDecCoinsFromCoins(sdk.NewCoin("btc", sdk.NewInt(10)), sdk.NewCoin("eth", sdk.NewInt(15)), sdk.NewCoin("mytoken", sdk.NewInt(5)))
+	s.Require().NoError(err)
 
 	for _, tc := range tests {
 		tc := tc
diff --git a/sei-cosmos/types/int.go b/sei-cosmos/types/int.go
index 45e521641b..2836c4d3a5 100644
--- a/sei-cosmos/types/int.go
+++ b/sei-cosmos/types/int.go
@@ -160,6 +160,15 @@ func (i Int) ToDec() Dec {
 	return NewDecFromInt(i)
 }
 
+// CanConvertToDec reports whether i fits in a whole-number Dec (i × 10^Precision).
+func (i Int) CanConvertToDec() bool {
+	if i.i == nil {
+		return false
+	}
+	scaled := new(big.Int).Mul(i.BigInt(), precisionMultiplier(0))
+	return scaled.BitLen() <= maxDecBitLen
+}
+
 // Int64 converts Int to int64
 // Panics if the value is out of range
 func (i Int) Int64() int64 {
diff --git a/sei-cosmos/x/auth/legacy/legacytx/stdtx.go b/sei-cosmos/x/auth/legacy/legacytx/stdtx.go
index 3798017e7a..c065b37c09 100644
--- a/sei-cosmos/x/auth/legacy/legacytx/stdtx.go
+++ b/sei-cosmos/x/auth/legacy/legacytx/stdtx.go
@@ -73,7 +73,11 @@ func (fee StdFee) GasPrices() sdk.DecCoins {
 	if fee.Gas > uint64(math.MaxInt64) {
 		panic(fmt.Sprintf("gas %d exceeds max int64", fee.Gas))
 	}
-	return sdk.NewDecCoinsFromCoins(fee.Amount...).QuoDec(sdk.NewDec(int64(fee.Gas))) //nolint:gosec G115 -- bounds checked above
+	decAmount, err := sdk.NewDecCoinsFromCoins(fee.Amount...)
+	if err != nil {
+		panic(err)
+	}
+	return decAmount.QuoDec(sdk.NewDec(int64(fee.Gas))) //nolint:gosec G115 -- bounds checked above
 }
 
 // StdTx is the legacy transaction format for wrapping a Msg with Fee and Signatures.
diff --git a/sei-cosmos/x/distribution/keeper/allocation.go b/sei-cosmos/x/distribution/keeper/allocation.go
index 82bc95275f..204834442d 100644
--- a/sei-cosmos/x/distribution/keeper/allocation.go
+++ b/sei-cosmos/x/distribution/keeper/allocation.go
@@ -20,10 +20,13 @@ func (k Keeper) AllocateTokens(
 	// (and distributed to the previous proposer)
 	feeCollector := k.authKeeper.GetModuleAccount(ctx, k.feeCollectorName)
 	feesCollectedInt := k.bankKeeper.GetAllBalances(ctx, feeCollector.GetAddress())
-	feesCollected := sdk.NewDecCoinsFromCoins(feesCollectedInt...)
+	feesCollected, err := sdk.NewDecCoinsFromCoins(feesCollectedInt...)
+	if err != nil {
+		panic(err)
+	}
 
 	// transfer collected fees to the distribution module account
-	err := k.bankKeeper.SendCoinsFromModuleToModule(ctx, k.feeCollectorName, types.ModuleName, feesCollectedInt)
+	err = k.bankKeeper.SendCoinsFromModuleToModule(ctx, k.feeCollectorName, types.ModuleName, feesCollectedInt)
 	if err != nil {
 		panic(err)
 	}
diff --git a/sei-cosmos/x/distribution/keeper/fee_pool.go b/sei-cosmos/x/distribution/keeper/fee_pool.go
index 292754e915..02c23eb006 100644
--- a/sei-cosmos/x/distribution/keeper/fee_pool.go
+++ b/sei-cosmos/x/distribution/keeper/fee_pool.go
@@ -10,17 +10,22 @@ import (
 func (k Keeper) DistributeFromFeePool(ctx sdk.Context, amount sdk.Coins, receiveAddr sdk.AccAddress) error {
 	feePool := k.GetFeePool(ctx)
 
+	decAmount, err := sdk.NewDecCoinsFromCoins(amount...)
+	if err != nil {
+		return err
+	}
+
 	// NOTE the community pool isn't a module account, however its coins
 	// are held in the distribution module account. Thus the community pool
 	// must be reduced separately from the SendCoinsFromModuleToAccount call
-	newPool, negative := feePool.CommunityPool.SafeSub(sdk.NewDecCoinsFromCoins(amount...))
+	newPool, negative := feePool.CommunityPool.SafeSub(decAmount)
 	if negative {
 		return types.ErrBadDistribution
 	}
 
 	feePool.CommunityPool = newPool
 
-	err := k.bankKeeper.SendCoinsFromModuleToAccount(ctx, types.ModuleName, receiveAddr, amount)
+	err = k.bankKeeper.SendCoinsFromModuleToAccount(ctx, types.ModuleName, receiveAddr, amount)
 	if err != nil {
 		return err
 	}
diff --git a/sei-cosmos/x/distribution/keeper/grpc_query_test.go b/sei-cosmos/x/distribution/keeper/grpc_query_test.go
index 1cb6b1718f..7eb6c83a31 100644
--- a/sei-cosmos/x/distribution/keeper/grpc_query_test.go
+++ b/sei-cosmos/x/distribution/keeper/grpc_query_test.go
@@ -592,7 +592,9 @@ func (suite *KeeperTestSuite) TestGRPCCommunityPool() {
 				suite.Require().Nil(err)
 				req = &types.QueryCommunityPoolRequest{}
 
-				expPool = &types.QueryCommunityPoolResponse{Pool: sdk.NewDecCoinsFromCoins(amount...)}
+				pool, err := sdk.NewDecCoinsFromCoins(amount...)
+				suite.Require().NoError(err)
+				expPool = &types.QueryCommunityPoolResponse{Pool: pool}
 			},
 			true,
 		},
diff --git a/sei-cosmos/x/distribution/keeper/hooks.go b/sei-cosmos/x/distribution/keeper/hooks.go
index ee00bc6f63..d125d12252 100644
--- a/sei-cosmos/x/distribution/keeper/hooks.go
+++ b/sei-cosmos/x/distribution/keeper/hooks.go
@@ -63,7 +63,11 @@ func (h Hooks) AfterValidatorRemoved(ctx sdk.Context, _ sdk.ConsAddress, valAddr
 				}
 			} else {
 				feePool := h.k.GetFeePool(ctx)
-				feePool.CommunityPool = feePool.CommunityPool.Add(sdk.NewDecCoinsFromCoins(coins...)...)
+				decCoins, err := sdk.NewDecCoinsFromCoins(coins...)
+				if err != nil {
+					panic(err)
+				}
+				feePool.CommunityPool = feePool.CommunityPool.Add(decCoins...)
 				h.k.SetFeePool(ctx, feePool)
 			}
 		}
diff --git a/sei-cosmos/x/distribution/keeper/keeper.go b/sei-cosmos/x/distribution/keeper/keeper.go
index c3fe032ef1..1340c5a299 100644
--- a/sei-cosmos/x/distribution/keeper/keeper.go
+++ b/sei-cosmos/x/distribution/keeper/keeper.go
@@ -127,11 +127,16 @@ func (k Keeper) WithdrawValidatorCommission(ctx sdk.Context, valAddr sdk.ValAddr
 	}
 
 	commission, remainder := accumCommission.Commission.TruncateDecimal()
+	commissionDec, err := sdk.NewDecCoinsFromCoins(commission...)
+	if err != nil {
+		return nil, err
+	}
+
 	k.SetValidatorAccumulatedCommission(ctx, valAddr, types.ValidatorAccumulatedCommission{Commission: remainder}) // leave remainder to withdraw later
 
 	// update outstanding
 	outstanding := k.GetValidatorOutstandingRewards(ctx, valAddr).Rewards
-	k.SetValidatorOutstandingRewards(ctx, valAddr, types.ValidatorOutstandingRewards{Rewards: outstanding.Sub(sdk.NewDecCoinsFromCoins(commission...))})
+	k.SetValidatorOutstandingRewards(ctx, valAddr, types.ValidatorOutstandingRewards{Rewards: outstanding.Sub(commissionDec)})
 
 	if !commission.IsZero() {
 		accAddr := sdk.AccAddress(valAddr)
@@ -169,12 +174,17 @@ func (k Keeper) GetTotalRewards(ctx sdk.Context) (totalRewards sdk.DecCoins) {
 // added to the pool. An error is returned if the amount cannot be sent to the
 // module account.
 func (k Keeper) FundCommunityPool(ctx sdk.Context, amount sdk.Coins, sender sdk.AccAddress) error {
+	decAmount, err := sdk.NewDecCoinsFromCoins(amount...)
+	if err != nil {
+		return err
+	}
+
 	if err := k.bankKeeper.SendCoinsFromAccountToModule(ctx, sender, types.ModuleName, amount); err != nil {
 		return err
 	}
 
 	feePool := k.GetFeePool(ctx)
-	feePool.CommunityPool = feePool.CommunityPool.Add(sdk.NewDecCoinsFromCoins(amount...)...)
+	feePool.CommunityPool = feePool.CommunityPool.Add(decAmount...)
 	k.SetFeePool(ctx, feePool)
 
 	return nil
diff --git a/sei-cosmos/x/distribution/keeper/keeper_test.go b/sei-cosmos/x/distribution/keeper/keeper_test.go
index 1f317a822d..7fdee31a5c 100644
--- a/sei-cosmos/x/distribution/keeper/keeper_test.go
+++ b/sei-cosmos/x/distribution/keeper/keeper_test.go
@@ -304,7 +304,9 @@ func TestFundCommunityPool(t *testing.T) {
 	err := app.DistrKeeper.FundCommunityPool(ctx, amount, addr[0])
 	assert.Nil(t, err)
 
-	assert.Equal(t, initPool.CommunityPool.Add(sdk.NewDecCoinsFromCoins(amount...)...), app.DistrKeeper.GetFeePool(ctx).CommunityPool)
+	wantPool, err := sdk.NewDecCoinsFromCoins(amount...)
+	require.NoError(t, err)
+	assert.Equal(t, initPool.CommunityPool.Add(wantPool...), app.DistrKeeper.GetFeePool(ctx).CommunityPool)
 	assert.Empty(t, app.BankKeeper.GetAllBalances(ctx, addr[0]))
 }
 
@@ -322,11 +324,28 @@ func TestFundCommunityPoolRejectsOutOfRangeAmount(t *testing.T) {
 	coins := sdk.NewCoins(sdk.NewCoin("bigcoin", maxAmt))
 	require.NoError(t, apptesting.FundAccount(app.BankKeeper, ctx, addr[0], coins))
 
-	require.Panics(t, func() {
-		_ = app.DistrKeeper.FundCommunityPool(ctx, coins, addr[0])
-	}, "funding the community pool with an out-of-range amount must be rejected")
+	require.NotPanics(t, func() {
+		err := app.DistrKeeper.FundCommunityPool(ctx, coins, addr[0])
+		require.Error(t, err)
+	})
 
 	// The stored fee pool must be unchanged after the rejected attempt.
-	require.NotPanics(t, func() { app.DistrKeeper.GetFeePool(ctx) })
 	require.True(t, app.DistrKeeper.GetFeePool(ctx).CommunityPool.IsZero())
+	require.Equal(t, coins, app.BankKeeper.GetAllBalances(ctx, addr[0]))
+}
+
+func TestDistributeFromFeePoolRejectsOutOfRangeAmount(t *testing.T) {
+	app := seiapp.Setup(t, false, false, false)
+	ctx := app.BaseApp.NewContext(false, tmproto.Header{})
+
+	recipient := seiapp.AddTestAddrs(app, ctx, 1, sdk.ZeroInt())[0]
+	maxAmt := sdk.NewIntFromBigInt(new(big.Int).Sub(new(big.Int).Lsh(big.NewInt(1), 256), big.NewInt(1)))
+	coins := sdk.NewCoins(sdk.NewCoin("bigcoin", maxAmt))
+
+	require.NotPanics(t, func() {
+		err := app.DistrKeeper.DistributeFromFeePool(ctx, coins, recipient)
+		require.Error(t, err)
+	})
+	require.True(t, app.DistrKeeper.GetFeePool(ctx).CommunityPool.IsZero())
+	require.True(t, app.BankKeeper.GetAllBalances(ctx, recipient).IsZero())
 }
diff --git a/sei-cosmos/x/distribution/proposal_handler_test.go b/sei-cosmos/x/distribution/proposal_handler_test.go
index 532535f019..fadbed266e 100644
--- a/sei-cosmos/x/distribution/proposal_handler_test.go
+++ b/sei-cosmos/x/distribution/proposal_handler_test.go
@@ -1,6 +1,7 @@
 package distribution_test
 
 import (
+	"math/big"
 	"testing"
 
 	tmproto "github.com/sei-protocol/sei-chain/sei-tendermint/proto/tendermint/types"
@@ -42,7 +43,9 @@ func TestProposalHandlerPassed(t *testing.T) {
 	require.True(t, app.BankKeeper.GetAllBalances(ctx, account.GetAddress()).IsZero())
 
 	feePool := app.DistrKeeper.GetFeePool(ctx)
-	feePool.CommunityPool = sdk.NewDecCoinsFromCoins(amount...)
+	poolCoins, err := sdk.NewDecCoinsFromCoins(amount...)
+	require.NoError(t, err)
+	feePool.CommunityPool = poolCoins
 	app.DistrKeeper.SetFeePool(ctx, feePool)
 
 	tp := testProposal(recipient, amount)
@@ -70,3 +73,23 @@ func TestProposalHandlerFailed(t *testing.T) {
 	balances := app.BankKeeper.GetAllBalances(ctx, recipient)
 	require.True(t, balances.IsZero())
 }
+
+func TestProposalHandlerRejectsOutOfRangeAmount(t *testing.T) {
+	app := seiapp.Setup(t, false, false, false)
+	ctx := app.BaseApp.NewContext(false, tmproto.Header{})
+
+	recipient := delAddr1
+	account := app.AccountKeeper.NewAccountWithAddress(ctx, recipient)
+	app.AccountKeeper.SetAccount(ctx, account)
+
+	maxAmt := sdk.NewIntFromBigInt(new(big.Int).Sub(new(big.Int).Lsh(big.NewInt(1), 256), big.NewInt(1)))
+	huge := sdk.NewCoins(sdk.NewCoin(sdk.DefaultBondDenom, maxAmt))
+	tp := testProposal(recipient, huge)
+	require.Error(t, tp.ValidateBasic(), "ValidateBasic must reject unconvertible spend amounts")
+
+	hdlr := distribution.NewCommunityPoolSpendProposalHandler(app.DistrKeeper)
+	require.NotPanics(t, func() {
+		require.Error(t, hdlr(ctx, tp))
+	})
+	require.True(t, app.BankKeeper.GetAllBalances(ctx, recipient).IsZero())
+}
diff --git a/sei-cosmos/x/distribution/types/msg.go b/sei-cosmos/x/distribution/types/msg.go
index 1e4810dfd7..b5c6b7ca5c 100644
--- a/sei-cosmos/x/distribution/types/msg.go
+++ b/sei-cosmos/x/distribution/types/msg.go
@@ -158,6 +158,9 @@ func (msg MsgFundCommunityPool) ValidateBasic() error {
 	if !msg.Amount.IsValid() {
 		return sdkerrors.Wrap(sdkerrors.ErrInvalidCoins, msg.Amount.String())
 	}
+	if _, err := sdk.NewDecCoinsFromCoins(msg.Amount...); err != nil {
+		return sdkerrors.Wrap(sdkerrors.ErrInvalidCoins, err.Error())
+	}
 	if msg.Depositor == "" {
 		return sdkerrors.Wrap(sdkerrors.ErrInvalidAddress, msg.Depositor)
 	}
diff --git a/sei-cosmos/x/distribution/types/msg_test.go b/sei-cosmos/x/distribution/types/msg_test.go
index fa2a4d4f9e..b4b2c749c4 100644
--- a/sei-cosmos/x/distribution/types/msg_test.go
+++ b/sei-cosmos/x/distribution/types/msg_test.go
@@ -1,6 +1,7 @@
 package types
 
 import (
+	"math/big"
 	"testing"
 
 	"github.com/stretchr/testify/require"
@@ -75,6 +76,7 @@ func TestMsgWithdrawValidatorCommission(t *testing.T) {
 
 // test ValidateBasic for MsgDepositIntoCommunityPool
 func TestMsgDepositIntoCommunityPool(t *testing.T) {
+	maxAmt := sdk.NewIntFromBigInt(new(big.Int).Sub(new(big.Int).Lsh(big.NewInt(1), 256), big.NewInt(1)))
 	tests := []struct {
 		amount     sdk.Coins
 		depositor  sdk.AccAddress
@@ -83,6 +85,7 @@ func TestMsgDepositIntoCommunityPool(t *testing.T) {
 		{sdk.NewCoins(sdk.NewInt64Coin("uatom", 10000)), sdk.AccAddress{}, false},
 		{sdk.Coins{sdk.NewInt64Coin("uatom", 10), sdk.NewInt64Coin("uatom", 10)}, delAddr1, false},
 		{sdk.NewCoins(sdk.NewInt64Coin("uatom", 1000)), delAddr1, true},
+		{sdk.NewCoins(sdk.NewCoin("uatom", maxAmt)), delAddr1, false},
 	}
 	for i, tc := range tests {
 		msg := NewMsgFundCommunityPool(tc.amount, tc.depositor)
diff --git a/sei-cosmos/x/distribution/types/proposal.go b/sei-cosmos/x/distribution/types/proposal.go
index 7ed9adb23f..b44794efa8 100644
--- a/sei-cosmos/x/distribution/types/proposal.go
+++ b/sei-cosmos/x/distribution/types/proposal.go
@@ -47,6 +47,9 @@ func (csp *CommunityPoolSpendProposal) ValidateBasic() error {
 	if !csp.Amount.IsValid() {
 		return ErrInvalidProposalAmount
 	}
+	if _, err := sdk.NewDecCoinsFromCoins(csp.Amount...); err != nil {
+		return ErrInvalidProposalAmount
+	}
 	if csp.Recipient == "" {
 		return ErrEmptyProposalRecipient
 	}