Yes — Cryptnox can hold sfrxETH after you add it manually as an ERC-20 token on Ethereum, or as its EVM-chain deployment or representation on a network such as Fraxtal, Arbitrum, Optimism, Polygon, BNB Smart Chain, Fantom, or Moonbeam. sfrxETH is not pre-programmed on the card. The card secures the private key for the 0x-prefixed EVM address, and that key is generated inside the secure element and never leaves it.
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sfrxETH is held with Cryptnox through EVM token configuration. On Ethereum, it is added as an ERC-20 token. On Fraxtal and other EVM-chain deployments or representations, the relevant network and token contract must be added manually before the wallet interface is expected to show the balance. The card does not arrive with sfrxETH already enabled.
For the buyer, the important distinction is between the asset display and the signing key. The wallet interface reads the selected EVM network and the sfrxETH contract entry. The Cryptnox card protects the private key for the 0x-prefixed address that controls transfers from that account. Frax describes the relationship between frxETH and sfrxETH in its frxETH asset overview, and publishes deployment details in its address documentation.
If you want to compare broader asset coverage before setting up sfrxETH, review the Cryptnox coin and blockchain support page. For this asset, support comes through manual EVM token or network setup, not through a pre-programmed token entry on arrival.
On Ethereum, sfrxETH is an ERC-20 token controlled from an Ethereum-style EVM account. The receiving address begins with 0x and follows the 20-byte EVM address format. To make the token visible in the wallet interface, the Ethereum sfrxETH contract entry must be present. The Cryptnox card does not need a separate sfrxETH-only mode; it signs for the EVM address that controls the token.
When you receive Ethereum-based sfrxETH, the address is the control point and the token contract is the display and transaction reference. The private key for the address is generated inside the Cryptnox secure element and never leaves it. The phone or wallet interface can prepare an Ethereum token transaction, but the card supplies the signature for the 0x account.
This setup is specific to an EVM token. If your portfolio also includes a non-EVM asset, the Cryptnox hardware wallet for Bitcoin page is a useful comparison because Bitcoin does not use the same 0x address model as Ethereum-based sfrxETH.
sfrxETH can also be held as an EVM-chain deployment or representation on networks such as Fraxtal, Arbitrum, Optimism, Polygon, BNB Smart Chain, Fantom, or Moonbeam when the relevant EVM network and token contract are added manually. In that workflow, the card still protects the private key for a 0x-prefixed account, but the selected network and token contract determine which sfrxETH balance the wallet interface reads.
This matters when moving between Ethereum and another EVM chain. A 0x address can look familiar across EVM networks, but Ethereum sfrxETH and a Fraxtal or Polygon representation are not displayed from one shared token entry. Each network context needs the correct sfrxETH contract entry for that chain.
When the selected network is Fraxtal, the sfrxETH entry must correspond to the Fraxtal deployment. When the selected network is Polygon, the entry must correspond to the Polygon representation. The card’s role is to sign for the 0x account; the network configuration controls which contract the interface queries.
If you hold other EVM assets alongside sfrxETH, the Cryptnox hardware wallet for Polygon page is a relevant comparison because Polygon also uses the EVM address pattern. For a different address model, the Cryptnox hardware wallet for TRON page helps separate TRON setup expectations from the EVM path used for sfrxETH.
For sfrxETH, the token entry in a wallet interface is not the main security boundary. Control comes from the private key for the 0x address that can sign Ethereum or EVM token transactions. In the Cryptnox Crypto Hardware Wallet – Dual-Card Set, private keys are generated inside the secure element and never leave it, so the key that controls the sfrxETH address is not exported to the phone or wallet interface.
Each card uses an EAL6+-certified chip for the secure element. For an sfrxETH holder, the practical result is that Ethereum, Fraxtal, or another added EVM network can present transaction details externally, while the signing key remains inside the card when the transaction is approved.
The free Cryptnox app on iOS and Android connects to Web3 through WalletConnect and works with MetaMask. For sfrxETH, that gives you a way to work with Ethereum or an added EVM network while keeping the signing key on the card. For product steps before adding the sfrxETH token entry, start with the Cryptnox hardware wallet tutorials.
The Dual-Card Set ships uninitialised. During setup, the seed is generated inside both secure elements, so the second card is the backup for the same wallet. For sfrxETH, that means the backup card controls the same 0x address that can hold the ERC-20 token on Ethereum or the relevant EVM-chain representation on another added network.
By default, the setup does not ask you to write down a recovery phrase. Instead, the second smart card is created as the backup during the same setup process. Importing an existing BIP39 recovery phrase is an advanced option, but the default path for the Dual-Card Set is to generate the seed inside both cards.
If one card is unavailable, the second card is the intended backup for the same EVM account. The sfrxETH token entry may still need to be added again in the wallet interface used to display the balance, especially if you are switching between Ethereum and another EVM deployment. The backup card controls the same wallet, while token visibility depends on the selected network and contract entry.
For buyers comparing this model across assets, the Cryptnox hardware wallet collection explains the smart-card approach used across supported wallet pages. For sfrxETH, the extra purchase consideration is manual EVM token setup for the chain where you hold the asset.
The Cryptnox card is a contact and NFC smart card. You can tap it to a phone or insert it into a reader when a signing action is needed. That dual-interface form factor fits an sfrxETH workflow because the phone or wallet interface can show Ethereum, Fraxtal, or another added EVM network, while the card signs for the address that controls the token.
On mobile, the Cryptnox app on iOS and Android is the card companion for Web3 use through WalletConnect and MetaMask. In an sfrxETH workflow, that can mean selecting Ethereum for the ERC-20 token, or selecting Fraxtal, Arbitrum, Optimism, Polygon, BNB Smart Chain, Fantom, or Moonbeam after that network and token contract have been added.
The same visible 0x pattern across EVM networks can make mistakes easy. Treat Ethereum sfrxETH and an EVM-chain representation as separate token entries tied to separate network contexts, even when the account address looks familiar.
The Cryptnox Crypto Hardware Wallet – Dual-Card Set is the product to choose when you want a smart-card wallet for the private key controlling an sfrxETH-capable 0x address. The set is sold uninitialised, and the backup card is created during setup when the seed is generated inside both secure elements.
The cards are Swiss-engineered and made in Switzerland. For sfrxETH, the buying decision should focus on whether you want hardware-backed control of an EVM address and are comfortable adding the token manually. The product does not arrive with sfrxETH already enabled; you add the Ethereum ERC-20 token entry or the relevant EVM network and token contract once you set up the wallet flow you plan to use.
If your portfolio includes other chains, compare setup expectations before purchase. The Cryptnox hardware wallet for Ronin page is useful when evaluating another network alongside sfrxETH, while this page is specifically about Ethereum and EVM-token handling for Staked Frax Ether.
No. sfrxETH is not pre-programmed on the card. You add it once as an ERC-20 token on Ethereum, or as the relevant EVM-chain deployment or representation after adding the required network and token contract details.
Use a 0x-prefixed 20-byte EVM address. That format applies when holding sfrxETH as an ERC-20 token on Ethereum and when using EVM deployments or representations such as Fraxtal, Arbitrum, Optimism, Polygon, BNB Smart Chain, Fantom, or Moonbeam.
Yes. Add the relevant Fraxtal network and the sfrxETH token contract manually. The Cryptnox card secures the private key for the EVM address, while the Fraxtal network and token entry determine how the sfrxETH balance is displayed and used.
The Dual-Card Set ships uninitialised. During setup, the seed is generated inside both secure elements, so the second card is the backup for the same wallet. By default, this setup does not require writing down a recovery phrase.
No. Unlock approval can use the phone’s face or fingerprint check through the Cryptnox app, but the card itself has no such sensor. The card’s role is to hold the private key inside the secure element and sign transactions.
Yes. The Cryptnox app works with MetaMask and connects to Web3 through WalletConnect. For sfrxETH, add the correct Ethereum token entry or the relevant EVM network and token contract so the asset can be displayed and used.
The private key for the 0x address is generated inside the card’s secure element and never leaves it. The phone or wallet interface can prepare the Ethereum or EVM transaction, but the signing key remains inside the card.
No, and on this network that is not a limitation. The Cryptnox wallet uses one address per chain. HD address rotation comes from Bitcoin’s UTXO model and the BIP32/BIP44/BIP49/BIP84 derivation scheme; on account-model networks each account is a single fixed address by design, so the question does not apply in the same way. Cryptnox’s single-address-per-chain behaviour matches how these networks work.
At the cryptography layer the card derives keys along BIP32 and SLIP-10 paths, one path per supported chain, though that is not exposed in the app as multi-address management.
Yes. Cryptnox ships worldwide from the official CRYPTNOX store. Orders to Switzerland, the European Union and the United States are dispatched from stock already held in each of those regions, so the parcel does not cross a customs border into your country and there are no import duties to pay. Orders to other destinations are shipped internationally, and any import duties or local taxes are set by the destination country and are the recipient’s responsibility. Current shipping rates are shown at checkout.