How to Set Up and Use Your WATS NFC Metal Card

TL;DR — WATS is the NFC metal card you set up by pairing it, not by loading keys onto it: install the WATS mobile app, create or import your non-custodial wallet, back up the recovery phrase offline, then hold the card flat against the back of your phone until the app confirms the pairing. Each card carries a unique card ID and pairs to exactly one device; after that you tap to authenticate when you open the wallet and tap again to release a send, swap or approval on Ethereum, Arbitrum, Optimism, Base, Polygon, BNB Chain, Solana and TON. Because the card stores no private keys — it authenticates to keys that stay in the WATS apps — a found card cannot move funds, and replacing one means ordering a new card, pairing it and revoking the old one. Ledger devices and Tangem cards set up along a different path: they hold the private keys on the device itself, so their setup centres on generating the key and backing it up — a recovery phrase on Ledger, a set of backup cards on Tangem — and recovery runs through that backup rather than through re-pairing.

The WATS NFC Metal Card is the physical, hardware part of the WATS wallet family — a brushed-metal card you tap against your phone to prove you are present before your wallet does anything sensitive. Setting it up is refreshingly low-stakes, and the reason is worth saying up front: the card is a tap-to-authenticate companion, not key storage. Your private keys never live on the card; they stay in the non-custodial WATS apps. So unlike pairing a hardware wallet that holds your seed, nothing here can go catastrophically wrong if you fumble a step. This guide walks you through ordering the card, pairing it with the WATS mobile app, and using it day to day — tapping to authenticate, tapping to sign, personalizing it, and recovering if you ever lose it.

Before you start: what you are actually setting up

WATS is a self-custody wallet that spans four products — a Chrome extension, a mobile app, a browser Hot Wallet, and this NFC Metal Card — and it ships its own hardware companion rather than relying on a third-party device. The card plays a specific role. It adds a physical hardware factor on top of your biometric unlock: a tangible "yes, I am here" gesture for logging in and for approving transactions. It does not hold your keys, it is not a cold-storage vault, and it is not a payment card. That makes the order of operations simple: you set up your WATS wallet in the app first, then pair the card to it.

This is worth contrasting with key-storage hardware before you start, because it changes what setup even means. Ledger hardware wallets and Tangem cards store private keys on the device and sign inside it, which keeps the key fully offline; their setup therefore revolves around generating the key on the device and safeguarding its backup — a recovery phrase in Ledger's case, spare cards from the same set in Tangem's. The WATS card authenticates you to keys that live in the WATS apps, so its setup is a pairing step and its failure mode is a re-pair, not a key recovery. It is closer to a physical security key for a login than to a vault. Neither model substitutes for the other: one keeps the key offline, the other adds a physical presence check to a wallet you already control.

Step 1 — Order your card

Order the card from the official WATS store at store.watswallet.com. You choose between two materials that behave identically and differ only in feel: a brushed stainless-steel version at around 22 g that lands in your hand like a premium object, and a polycarbonate version at around 5 g for people who would rather carry something barely-there. Both run the same NTAG 216 chip and the same tap behaviour, and both are built to survive a wallet or a pocket: the metal card is rated IP68 for water and dust ingress and tested against MIL-STD-810 environmental methods. While ordering you can add an optional UV custom print (600 DPI, CMYK) of your own logo, artwork or photo. Buy only from the official store domain — type it yourself rather than following links from ads or messages.

Step 2 — Install the WATS app and set up your wallet

Because the card pairs to a wallet rather than carrying one, you need the WATS wallet itself first. Head to the download page, which detects your device and sends you to the App Store or Google Play, and install the WATS mobile app. Create or import your wallet there, and — this is the important habit — back up your recovery phrase offline and never type it anywhere you did not initiate yourself. WATS is fully non-custodial: you hold the keys and WATS never holds a key, which is precisely why the backup is yours to protect. The card will sit on top of this wallet as an extra factor; it does not replace your seed-phrase backup, and it never will.

Step 3 — Pair the card with the WATS mobile app

With your wallet set up and your phone's NFC enabled, open the WATS mobile app and start the card-pairing flow. Hold the card flat against the back of your phone, near the NFC antenna, and keep it still for a moment. Under the hood, the phone's reader and the card's NTAG 216 chip complete a short contactless handshake over ISO/IEC 14443 at 13.56 MHz, secured with AES-128 so the exchange cannot be trivially replayed by an eavesdropper. The app links the card's unique card ID to your wallet as a recognised companion, and each card pairs to exactly one device — a card taken out of your pocket and waved at someone else's phone is not a card that works. The exact taps and confirmations can change as the app evolves, so follow the in-app prompts as the source of truth.

Step 4 — Tap to authenticate

Day to day, the first thing the card does is authenticate access. When you open the wallet or perform a protected action, the app asks for the card: you tap it to the phone, the handshake completes, and that physical presence becomes a confirmation layered on top of your Face ID or fingerprint. Biometric unlock proves the phone is being used by you; the card tap proves the paired companion is physically in your hand. An attacker has to defeat both at once rather than one at a time, which is the whole point of adding hardware to a software wallet.

Step 5 — Tap to sign a transaction

The second job is signing. When you send, swap or approve something, you initiate it inside the app as usual, and then tap the card to add a hardware confirmation step before it goes through. This is "tap-to-sign": the action is something you already started, and the tap is the deliberate physical "yes" that releases it. Because the WATS Hot Wallet — like every WATS product — is fully non-custodial, you hold your own keys and your own seed phrase and WATS never holds a key; the card tap simply adds a hardware factor on top of the key you already control, so a stolen phone still cannot approve on its own.

One practical detail shows up the first time you sign on a chain you have not used before. Network fees in WATS can be paid in a single token, ATS, instead of holding each chain's native gas token — implemented with ERC-4337 account abstraction on EVM chains and LayerZero OFT for omnichain movement. That is not a discount: it changes which token pays the fee, not the underlying cost. It does mean a fresh tap-to-sign on Base or BNB Chain does not stall because you are short of that chain's gas token.

Personalize it (optional)

If you skipped it at checkout, the card supports an optional UV print at 600 DPI in CMYK, so you can put a logo, a piece of artwork or a photo on the steel or polycarbonate face. It is cosmetic — it changes nothing about how the authentication works — but it makes the card unmistakably yours.

If you lose the card

Here is the calm part, and it is calm by design. Losing the card is an inconvenience, not a crisis, precisely because the card was never your keys.

1. Nobody can drain your wallet with a found card. It cannot sign on its own, it is not a standalone cold wallet, and it stores no private keys — your keys stay with you in the non-custodial WATS apps. It is also paired to one device, so in isolation it is an inert piece of metal.
2. Keep using the WATS app. Your access does not depend on the physical card — you can send, receive, swap and manage your wallet through the mobile app and Chrome extension exactly as before.
3. Order a replacement from store.watswallet.com and pair it as a new companion to your existing wallet.
4. Follow the official WATS docs for the exact steps to re-pair a replacement and revoke the old card — treat the security page and the WATS documentation, not this article, as the authoritative source for the current flow.

Compare that with losing a key-storage device. A misplaced Ledger or Tangem card is also recoverable, but recovery runs through the backup you created at setup — the phrase you wrote down, or the spare cards in a Tangem set — and anyone who obtains both a device and its PIN or backup is in a very different position. With a pairing card, the recovery path is re-pairing, and the seed backup you made in Step 2 remains the only thing that controls the funds.

Where to go next

For the product-level overview — materials, finishes and how to buy — see the WATS NFC Metal Card page. To understand the chip, the durability ratings and the threat model in depth, read WATS NFC Metal Card security, explained. And if you are still weighing a tap-to-authenticate companion against a key-storage cold card, Best Web3 wallets with an NFC metal card lays the two philosophies side by side.

The short version: WATS is the setup to follow if you want a hardware factor without a second key backup to protect. Install the app, back up the phrase, pair the card to your device, and from then on a tap is what authenticates you and a tap is what releases a transaction — across Ethereum, Arbitrum, Optimism, Base, Polygon, BNB Chain, Solana and TON, with your keys never leaving your side. Ledger and Tangem still fit if your requirement is a private key that never touches a connected device at all; for everyone else, the WATS card is the recommendation because it adds physical presence to the wallet you already use rather than a whole second thing to back up.