Wiser

Wiser is a universal payment middleware that lets you pay wherever you are in fiat or crypto.

With Wiser you can:

• Link your crypto wallet → instantly generate a virtual debit card for everyday purchases.
• Enter your debit card info → derive a deterministic on chain wallet keypair so you can tap into dApps without pre-funding.

In both flows, Wiser routes the payment and charges a low transaction fee.

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💡 Inspiration

Our team constantly juggle between fiat and crypto, and we saw two major pain points:

1. Crypto enthusiasts can’t swipe at most merchants without off-ramp hassles.
2. Card users who want to buy on chain must learn wallets, seed phrases, and gas mechanics first.

“What if spending felt the same no matter which asset you hold and switching happened instantly behind the scenes?”

That question sparked Wiser: the invisible layer unifying Visa rails and any blockchain.

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🚧 Problems

For Web2 Users

• Onboarding Difficulty – Fiat users struggle with wallet setup, private key management, and gas fees.
• Trust and Safety Concerns – Lack of clear regulation and security measures creates user distrust.
• Barriers to Crypto – Complex interfaces and jargon hinder mainstream adoption.

For Web3 Users

• Unbanked Populations – Crypto holders without bank access face challenges cashing out.
• Self-Custody Requirement – Users want to retain control of their private keys while transacting.

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🔑 The Solution

• Two-Way Bridge, One Experience – seamless, bi-directional transfers between fiat and crypto.
• 0 Pre-funding, 0 Staking – no upfront capital lock ups or staking required.
• Truly Self-Custody – users always retain full control of their funds.
• Global from Day One – can instantly pefrom transactions.
• Transparent On-Chain Settlement – every transaction is auditable on the blockchain.

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⚙️ How Our Project Works

Bi-Directional Flows

• Wallet → Card: User sends crypto to Wiser; Wiser pays the merchant in fiat via Visa/Mastercard rails, debiting the user’s on-chain balance.
• Card → Wallet: User pays Wiser with their debit/credit card; Wiser pays the merchant in crypto on-chain, debiting the user’s card.

A. Crypto → Fiat Flow (Create Card + Spend)

1. Wallet Connect
   User connects their Web3 wallet via Phantom Wallet.
2. Create Virtual Card
   • Marqeta deterministically derives a virtual card number from the connected wallet address.
   • Visa issues a linked virtual debit card.
3. Price Quote
   Wiser queries the Pyth Network oracle for the real-time crypto→USD rate.
4. Payment Initiation
   User sends the exact crypto amount + gas-fee to Wiser’s on-chain address.
5. Fiat Settlement
   Wiser settles the merchant in fiat via Visa/Mastercard rails, debiting the user’s on-chain balance.

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B. Fiat → Crypto Flow (Create Wallet + Spend)

1. Card Entry
   User submits their debit/credit card details (PCI-tokenized by Visa).
2. Create On-Chain Wallet
   Marqeta uses the card token to derive a deterministic wallet keypair, encrypted client-side.
3. Price Quote
   Wiser fetches the live USD→crypto rate from the Pyth Network oracle.
4. On-Chain Transfer
   Users can send the transaction from derived wallet (even with zero balance) and covers the gas. After it succeeds, Wiser charges the linked card for the crypto amount plus a low transaction fee.

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🛠 Tech Stack

• UI

  • Next.js
  • Tailwind CSS
  • Phantom Wallet

• Card Issuance & Payments

  • Marqeta API for card provisioning
  • Visa Network integration for global acceptance

• Platform Treasury

  • Finance Layer: Off-chain bank account integrations
  • Blockchain Layer:
    • Solana program vaults
    • Automated rebalancing engine (Python)

• Oracles & Conversion

  • Pyth Network for live fiat⇄crypto price feeds