One-click payments

One-click crypto payments® revolutionize the way users pay with crypto by eliminating the traditional two-step approval process. This innovative solution combines token approval and transfer into a single, gasless transaction, providing a seamless experience similar to traditional payment methods while maintaining the security and transparency of blockchain technology.

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Traditional payment flow

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One-click crypto payment® flow

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Technical Implementation

One-click crypto payments® leverage the EIP-2612 permit standard to create a more efficient token approval mechanism. Here’s how it works:

1. Permit Signature: Instead of calling approve(), the dapp requests a permit signature from the user’s wallet. This signature contains:
   • The token approval amount (set to match the purchase amount)
   • The deadline for the approval (set to 5 minutes only)
   • The spender address (dapp)
   • A nonce to prevent replay attacks
2. Bundled Transaction: The dapp then submits a single transaction that:
   • Validates the permit signature
   • Executes the token transfer
   • Pays for all gas costs
3. Security Features:
   • Time-bound approvals through deadlines (5 minutes only)
   • Nonce-based signature verification
   • Replay attack protection
   • Atomic transactions (either both operations succeed or both fail)

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Benefits

One-click crypto payments® offer significant advantages for both users and merchants:

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For Users

• Simplified Experience: Single signature instead of two separate transactions
• No ETH Required: Users don’t need to hold ETH for gas fees
• Faster Checkout: Transaction time reduced by half
• Lower Costs: No gas fees to pay for approvals
• Better Security: Time-bound approvals with automatic expiration

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For Merchants

• Higher Conversion Rates: Reduced friction leads to up to 30% more completed transactions
• Better User Experience: Customers are more likely to return
• Gas Cost Control: Predictable gas costs for the business
• Competitive Advantage: Stand out with modern payment solutions
• Increased Trust: Transparent and secure payment process

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Transaction costs

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Traditional allowance and transferFrom payment

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With one-click crypto payments®

(ℹ︎) Merchants can limit the amount they want to sponsor. For example, 0.2% of the purchase value.

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Supported tokens and chains

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Frequently Asked Questions

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What happens if a permit signature expires?

Permit signatures have a built-in deadline. If a signature expires before the transaction is processed, the user will need to sign a new permit. This is a security feature to prevent delayed or malicious transactions.

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Do I need to hold any ETH in my wallet?

No, you don’t need to hold any ETH. All gas costs are covered by the merchant through the one-click payment system.

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Which wallets support one-click payments?

One-click payments are supported by all major Web3 wallets that implement the EIP-2612 standard, including MetaMask, Coinbase Wallet, Binance Web3 wallet, WalletConnect, and most other popular wallets.

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What happens if the transaction fails?

If a transaction fails, no tokens will be transferred from your wallet. The permit signature is only valid for a specific amount and time period, ensuring your funds remain secure.

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Can I set a custom approval amount?

The permit signature is built with the specific amount needed for the purchase.

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Is this solution secure?

Yes, one-click payments use industry-standard cryptographic signatures and follow the EIP-2612 specification. The system includes multiple security features like nonce verification and time-bound approvals.