Stealf

What Stealf is trying to do

Stealf describes itself as a privacy layer for everyday finance, built on Solana, and the design has two halves that are deliberately kept apart. One is a stablecoin payment account that behaves like normal money - tap a card at the counter, send a transfer, all on a compliant account wired into the conventional banking system. The other is a private wallet that you control, where transfers stay private. Stealf's claim is that there is no on-chain link between them, so you can spend without revealing which wallet the money came from.

The infrastructure it leans on

Rather than building every piece itself, Stealf assembles established privacy and custody primitives: Arcium for encrypted compute, Umbra for private transfers, Solana for settlement, and Turnkey for key management inside a trusted execution environment. That is a sensible architecture for a small team - the hard cryptographic work sits with specialist protocols - but it also means the product's security and privacy guarantees depend on those third parties continuing to function, not just on Stealf.

How far along it is

Not far, publicly. Access is through TestFlight while the app is in beta, and the site publishes no fee schedule, no spending limits, no card network, no issuing partner, no country list and no launch date. The FAQ raises the questions users will care about - who Stealf is for, whether identity verification is required, whether the card is Solana-only, and whether you can export your private keys - which suggests the answers exist for beta users but have not been written into public terms yet.

How to treat it

This is one to watch rather than one to sign up for on the strength of the marketing. The combination it is aiming at is genuinely underserved - private spending without giving up a card that works in shops - and the choice of Umbra and Arcium puts it in more serious technical company than most new cards. But without published fees, an issuing partner, a licence and a launch plan, there is nothing concrete to compare against the rest of this directory, and no basis for trusting it with meaningful balances yet.

Stealf splits a balance into a stablecoin spending account you can tap at the counter and a separate savings side, and it is still in beta. Fuse Card spends USDC from a self-custodial Solana wallet without that split, and MiniPay does the same from a self-custodial Celo wallet. The crypto cards listing notes which of these are live.

Two-layer design

• Stablecoin account for everyday spending, wired to the conventional banking system and described as compliant.
• Private wallet that you create or import, where you hold the keys and transfers stay private.
• No on-chain link between the spending account and the private wallet.
• Spend without revealing your wallet, and trade without revealing your identity.

Infrastructure partners

• Arcium for encrypted compute using multi-party computation.
• Umbra for private transfers.
• Solana for settlement.
• Turnkey for key management inside a trusted execution environment.

Card and account

• Tap the card at the counter or send a transfer from the stablecoin account.
• Account secured by Turnkey.
• Distribution is through TestFlight while the product is in beta.

Still to be published

• Fee schedule for card use, top-ups and transfers.
• Spending limits and ATM access.
• Card network and issuing partner.
• Supported countries and launch timing.
• Identity verification requirements for the spending account.

Assets

Stealf is built around stablecoins on Solana - the spending account is described as a stablecoin account, which in practice means dollar-denominated tokens such as USDC and USDT. Solana is the settlement layer, and the FAQ addresses whether the product is Solana-only, so support for other chains may be planned rather than available today.

The privacy model

The privacy comes from keeping the spending account and the private wallet unlinkable. Money arrives in the private wallet, where transfers are private through Umbra, and the spending account is what faces the merchants and banks. Stealf's pitch is that an observer cannot connect the two, which is a meaningfully different claim from cards that simply avoid identity checks - here the point is to break the transaction graph rather than to skip verification.

Key management

You hold the keys to the private wallet, can create or import it, and the FAQ covers exporting private keys. The spending account is secured by Turnkey's trusted execution environment instead, which means the account side is custodial in practice even though the wallet side is not - hence the hybrid custody model.

What is published

Nothing on cost. Stealf's site describes the product, its architecture and its infrastructure partners without listing a single fee - no issuance fee, no top-up fee, no spending fee, no FX fee, no ATM fee and no monthly or annual charge.

What that means for anyone evaluating it

With no fee schedule there is no way to compare Stealf against the rest of this directory, or to know whether the privacy features come at a cost, as they do with most privacy-focused cards that offset the lack of interchange revenue with higher reload or transaction fees. The same applies to limits: without published spending or balance caps there is no way to judge whether the account suits everyday use or only small balances.

What to ask before using it

Three questions determine whether this becomes a card you can rely on: who issues the card and under what licence, what the reload and spending fees are, and what identity verification the compliant spending account requires. Until Stealf publishes those, the beta is best treated as an experiment with small amounts rather than a place to hold savings.