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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

When making an ERC20 payment through a dapp, you are required to:
  1. sign an allowance for the dapp to spend on your behalf
  2. execute the transfer.
Both transactions have gas costs that the user needs to pay in ETH.

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One-click crypto payment® flow

When using one-click crypto Payment® through our dapp, you only need to:
  1. Sign a permit function that bundles the allowance and transfer of funds.
This permit function has no gas cost, so you don’t need to pay any ETH.
  1. Our dapp requests to transfer the funds on your behalf, and we pay the gas in ETH.

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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

Step
Gas paid inETH
Gas CostOn L2s few cents
Who pays GasUser

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With one-click crypto payments®

Step
Gas paid inERC20
Gas CostOn L2s under one cent
Who pays GasMerchant(ℹ︎)
(ℹ︎) Merchants can limit the amount they want to sponsor. For example, 0.2% of the purchase value.
Token configuration interface showing Base network with USDC, DAI, and BIRB tokens. USDC has 0.5% gas sponsorship, DAI has 0.2%, and BIRB is not available.

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Supported tokens and chains

ChainTokensStatus
BaseUSDC✅
EthereumUSDCcomming soon
OptimismUSDCcomming soon
ArbitrumUSDCcomming soon
BaseUSDTcomming soon
EthereumUSDTcomming soon
OptimismUSDTcomming soon
ArbitrumUSDTcomming soon

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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.
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