diff --git a/src/safe_cli/ethereum_client.py b/src/safe_cli/ethereum_client.py
new file mode 100644
index 00000000..3c3f2da6
--- /dev/null
+++ b/src/safe_cli/ethereum_client.py
@@ -0,0 +1,35 @@
+from safe_eth.eth import EthereumClient, TxSpeed
+from web3 import Web3
+from web3.types import TxParams, Wei
+
+# safe-cli refuses a cap above this many times the node's gas price. A cap that high is a typo more often than a
+# choice: extra zeros, or wei typed as gwei.
+MAX_FEE_PER_GAS_LIMIT = 10
+
+
+class SafeCliEthereumClient(EthereumClient):
+    """
+    ``EthereumClient`` that sends EIP-1559 transactions with the ``maxFeePerGas`` the user gave in
+    ``--max-fee-per-gas``. Without the option it behaves as ``EthereumClient``.
+    """
+
+    # The user's cap in wei, or None
+    max_fee_per_gas: int | None = None
+
+    def set_eip1559_fees(
+        self, tx: TxParams, tx_speed: TxSpeed = TxSpeed.NORMAL
+    ) -> TxParams:
+        tx = super().set_eip1559_fees(tx, tx_speed)
+        if self.max_fee_per_gas is None:
+            return tx
+        node_price = self.w3.eth.gas_price
+        if node_price and self.max_fee_per_gas > MAX_FEE_PER_GAS_LIMIT * node_price:
+            raise ValueError(
+                f"--max-fee-per-gas: {Web3.from_wei(self.max_fee_per_gas, 'gwei')} gwei is more than "
+                f"{MAX_FEE_PER_GAS_LIMIT} times the node's gas price ({Web3.from_wei(node_price, 'gwei')} gwei). "
+                "safe-cli sent nothing."
+            )
+        tx["maxFeePerGas"] = Wei(self.max_fee_per_gas)
+        # A node rejects a tip above the cap
+        tx["maxPriorityFeePerGas"] = min(tx["maxPriorityFeePerGas"], tx["maxFeePerGas"])
+        return tx
diff --git a/src/safe_cli/main.py b/src/safe_cli/main.py
index 84cbeb54..edb681e7 100644
--- a/src/safe_cli/main.py
+++ b/src/safe_cli/main.py
@@ -15,6 +15,7 @@
 
 from . import VERSION
 from .argparse_validators import check_hex_str
+from .ethereum_client import SafeCliEthereumClient
 from .operators import SafeOperator
 from .safe_cli import SafeCli
 from .tx_builder.exceptions import SoliditySyntaxError, TxBuilderEncodingError
@@ -29,6 +30,31 @@
 
 app = typer.Typer(name="Safe CLI")
 
+MAX_FEE_PER_GAS_OPTION = "--max-fee-per-gas"
+
+
+@app.callback()
+def global_options(
+    max_fee_per_gas: Annotated[
+        float | None,
+        typer.Option(
+            MAX_FEE_PER_GAS_OPTION,
+            envvar="SAFE_CLI_MAX_FEE_PER_GAS",
+            help="maxFeePerGas in gwei for each transaction safe-cli sends. Without it safe-cli estimates the "
+            "fee from the fee history. Limit: 10 times the node's gas price. Put it before the command or the "
+            "Safe address.",
+            show_default=False,
+        ),
+    ] = None,
+):
+    if max_fee_per_gas is not None and not max_fee_per_gas > 0:
+        raise typer.BadParameter(
+            "expected a positive number of gwei", param_hint=MAX_FEE_PER_GAS_OPTION
+        )
+    SafeCliEthereumClient.max_fee_per_gas = (
+        None if max_fee_per_gas is None else Web3.to_wei(max_fee_per_gas, "gwei")
+    )
+
 
 def _build_safe_operator_and_load_keys(
     safe_address: ChecksumAddress,
@@ -401,7 +427,11 @@ def _is_safe_cli_default_command(arguments: list[str]) -> bool:
 
 
 def main():
+    # --max-fee-per-gas and its value come before the command
+    first = 1
+    if len(sys.argv) > 1 and sys.argv[1].startswith(MAX_FEE_PER_GAS_OPTION):
+        first = 2 if "=" in sys.argv[1] else 3
     # By default, the attended mode is initialised. Otherwise, the required command must be specified.
-    if _is_safe_cli_default_command(sys.argv):
-        sys.argv.insert(1, "attended-mode")
+    if _is_safe_cli_default_command(sys.argv[:1] + sys.argv[first:]):
+        sys.argv.insert(first, "attended-mode")
     app()
diff --git a/src/safe_cli/operators/safe_operator.py b/src/safe_cli/operators/safe_operator.py
index 0c94779b..f3e20699 100644
--- a/src/safe_cli/operators/safe_operator.py
+++ b/src/safe_cli/operators/safe_operator.py
@@ -38,6 +38,7 @@
 from web3.contract import Contract
 from web3.exceptions import BadFunctionCallOutput
 
+from safe_cli.ethereum_client import SafeCliEthereumClient
 from safe_cli.ethereum_hd_wallet import get_account_from_words
 from safe_cli.operators.exceptions import (
     AccountNotLoadedException,
@@ -162,7 +163,7 @@ def __init__(
     ):
         self.address = address
         self.node_url = node_url
-        self.ethereum_client = EthereumClient(self.node_url)
+        self.ethereum_client = SafeCliEthereumClient(self.node_url)
         self.ens = ENS.from_web3(self.ethereum_client.w3)
         self.network: EthereumNetwork = self.ethereum_client.get_network()
         try:
diff --git a/tests/test_ethereum_client.py b/tests/test_ethereum_client.py
new file mode 100644
index 00000000..0be179c5
--- /dev/null
+++ b/tests/test_ethereum_client.py
@@ -0,0 +1,184 @@
+import unittest
+from unittest import mock
+
+from eth_account import Account
+from safe_eth.eth import EthereumClient
+from typer.testing import CliRunner
+from web3 import Web3
+
+from safe_cli.ethereum_client import MAX_FEE_PER_GAS_LIMIT, SafeCliEthereumClient
+from safe_cli.main import app, main
+from safe_cli.operators.hw_wallets.hw_wallet_manager import HwWalletManager
+
+from .safe_cli_test_case_mixin import SafeCliTestCaseMixin
+
+GWEI = 10**9
+runner = CliRunner()
+
+
+class TestSafeCliEthereumClient(SafeCliTestCaseMixin, unittest.TestCase):
+    def tearDown(self):
+        SafeCliEthereumClient.max_fee_per_gas = None
+
+    def _fees(self, base_fee: int, tip: int, node_price: int) -> dict:
+        ethereum_client = SafeCliEthereumClient(self.ethereum_node_url)
+        with (
+            mock.patch.object(
+                EthereumClient, "estimate_fee_eip1559", return_value=(base_fee, tip)
+            ),
+            mock.patch.object(
+                type(ethereum_client.w3.eth),
+                "gas_price",
+                new_callable=mock.PropertyMock,
+                return_value=node_price,
+            ),
+        ):
+            return ethereum_client.set_eip1559_fees({"gasPrice": 1})
+
+    def test_without_the_option_nothing_changes(self):
+        fees = self._fees(20 * GWEI, 2 * GWEI, 25 * GWEI)
+        self.assertEqual(fees["maxFeePerGas"], 22 * GWEI)
+        self.assertEqual(fees["maxPriorityFeePerGas"], 2 * GWEI)
+
+    def test_max_fee_per_gas(self):
+        SafeCliEthereumClient.max_fee_per_gas = 715_000 * GWEI
+        # A node that forecasts 625,625 gwei for the next block and charges 715,000
+        fees = self._fees(625_625 * GWEI, 0, 715_000 * GWEI)
+        self.assertEqual(fees["maxFeePerGas"], 715_000 * GWEI)
+        self.assertEqual(fees["maxPriorityFeePerGas"], 0)
+        self.assertNotIn("gasPrice", fees)
+
+        # A cap below the estimated tip lowers the tip to the cap
+        SafeCliEthereumClient.max_fee_per_gas = 1 * GWEI
+        fees = self._fees(20 * GWEI, 2 * GWEI, 22 * GWEI)
+        self.assertEqual(fees["maxFeePerGas"], 1 * GWEI)
+        self.assertEqual(fees["maxPriorityFeePerGas"], 1 * GWEI)
+
+    def test_limit(self):
+        SafeCliEthereumClient.max_fee_per_gas = MAX_FEE_PER_GAS_LIMIT * 22 * GWEI
+        fees = self._fees(20 * GWEI, 2 * GWEI, 22 * GWEI)
+        self.assertEqual(fees["maxFeePerGas"], MAX_FEE_PER_GAS_LIMIT * 22 * GWEI)
+
+        SafeCliEthereumClient.max_fee_per_gas += 1
+        with self.assertRaisesRegex(ValueError, "more than 10 times"):
+            self._fees(20 * GWEI, 2 * GWEI, 22 * GWEI)
+
+        # Some development chains report a gas price of 0: no limit applies
+        self._fees(20 * GWEI, 2 * GWEI, 0)
+
+    def test_command_line_option(self):
+        result = runner.invoke(app, ["--max-fee-per-gas", "31.5", "version"])
+        self.assertEqual(result.exit_code, 0)
+        self.assertEqual(SafeCliEthereumClient.max_fee_per_gas, 31_500_000_000)
+
+        result = runner.invoke(app, ["version"])
+        self.assertEqual(result.exit_code, 0)
+        self.assertIsNone(SafeCliEthereumClient.max_fee_per_gas)
+
+        for value in ("0", "-1", "nan", "fast"):
+            result = runner.invoke(app, [f"--max-fee-per-gas={value}", "version"])
+            self.assertEqual(result.exit_code, 2, value)
+
+        with mock.patch.dict("os.environ", {"SAFE_CLI_MAX_FEE_PER_GAS": "40"}):
+            runner.invoke(app, ["version"])
+            self.assertEqual(SafeCliEthereumClient.max_fee_per_gas, 40 * GWEI)
+            # The command line overrides the environment
+            runner.invoke(app, ["--max-fee-per-gas=41", "version"])
+            self.assertEqual(SafeCliEthereumClient.max_fee_per_gas, 41 * GWEI)
+
+    @mock.patch.object(type(app), "__call__")
+    def test_attended_mode_after_the_option(self, mock_app: mock.MagicMock):
+        safe, node = Account.create().address, "http://localhost:8545"
+        for arguments, expected in (
+            ([safe, node], ["attended-mode", safe, node]),
+            (
+                ["--max-fee-per-gas", "30", safe, node],
+                ["--max-fee-per-gas", "30", "attended-mode", safe, node],
+            ),
+            (
+                ["--max-fee-per-gas=30", safe, node],
+                ["--max-fee-per-gas=30", "attended-mode", safe, node],
+            ),
+            (
+                ["--max-fee-per-gas", "30", "send-ether", safe, node],
+                ["--max-fee-per-gas", "30", "send-ether", safe, node],
+            ),
+        ):
+            with mock.patch("sys.argv", ["safe-cli", *arguments]) as argv:
+                main()
+                self.assertEqual(argv[1:], expected)
+
+    def _sent_to(self, address: str, since_block: int) -> list:
+        return [
+            transaction
+            for number in range(since_block + 1, self.w3.eth.block_number + 1)
+            for transaction in self.w3.eth.get_block(number, True)["transactions"]
+            if transaction["to"] == address
+        ]
+
+    def test_every_way_of_sending_uses_it(self):
+        safe_operator = self.setup_operator()
+        owner = self.ethereum_test_account
+        safe_operator.accounts.add(owner)
+        safe_operator.default_sender = owner
+        self.w3.eth.send_transaction(
+            {"from": owner.address, "to": safe_operator.address, "value": 10}
+        )
+        # The fee history forecasts 0.6 x the base fee the chain charges, so the node refuses the estimate
+        forecast = self.w3.eth.get_block("latest")["baseFeePerGas"] * 6 // 10
+        cap = self.w3.eth.gas_price * 3
+        SafeCliEthereumClient.max_fee_per_gas = cap
+        with mock.patch.object(
+            EthereumClient, "estimate_fee_eip1559", return_value=(forecast, 0)
+        ):
+            # Executing a Safe transaction with a local key
+            block = self.w3.eth.block_number
+            self.assertTrue(safe_operator.send_ether(Account.create().address, 1))
+            (transaction,) = self._sent_to(safe_operator.address, block)
+            self.assertEqual(
+                (transaction["type"], transaction["maxFeePerGas"]), (2, cap)
+            )
+
+            # approve_hash
+            block = self.w3.eth.block_number
+            self.assertTrue(
+                safe_operator.approve_hash(Web3.keccak(text="fee cap"), owner.address)
+            )
+            (transaction,) = self._sent_to(safe_operator.address, block)
+            self.assertEqual(
+                (transaction["type"], transaction["maxFeePerGas"]), (2, cap)
+            )
+
+            # Executing a Safe transaction with a hardware wallet
+            sender = mock.Mock()
+            sender.address = owner.address
+            sender.get_signed_raw_transaction.side_effect = lambda tx, chain_id: (
+                self.w3.eth.account.sign_transaction(tx, owner.key).raw_transaction
+            )
+            safe_operator.default_sender = None
+            safe_operator.hw_wallet_manager = HwWalletManager()
+            safe_operator.hw_wallet_manager.sender = sender
+            block = self.w3.eth.block_number
+            self.assertTrue(safe_operator.send_ether(Account.create().address, 1))
+            (transaction,) = self._sent_to(safe_operator.address, block)
+            self.assertEqual(
+                (transaction["type"], transaction["maxFeePerGas"]), (2, cap)
+            )
+
+        # Without the option the node refuses: the wording differs between Ganache and anvil
+        SafeCliEthereumClient.max_fee_per_gas = None
+        safe_operator.default_sender = owner
+        forecast = self.w3.eth.get_block("latest")["baseFeePerGas"] * 6 // 10
+        with (
+            mock.patch.object(
+                EthereumClient, "estimate_fee_eip1559", return_value=(forecast, 0)
+            ),
+            self.assertRaisesRegex(
+                Exception, r"(?i)max ?fee ?per ?gas.*less than.*base ?fee"
+            ),
+        ):
+            safe_operator.send_ether(Account.create().address, 1)
+
+
+if __name__ == "__main__":
+    unittest.main()