Fiat Onramp Bridge — Sub Protocol

Contract Details

Categorybridge

Files13

Price$12.99

Tech Stack

TypeScript Express Stripe SDK ethers.js

Chains

Ethereum Arbitrum Base Optimism Polygon

Description

Stripe-to-crypto bridge service for purchasing subscription NFTs with credit/debit cards. Handles Stripe checkout, crypto minting, webhook verification, and receipt generation. Users pay in fiat, receive NFT.

Features

✓ Stripe Checkout integration for fiat payments
✓ Automatic NFT minting after payment confirmation
✓ Webhook signature verification
✓ Idempotent payment processing
✓ Receipt generation with on-chain tx links
✓ Multi-currency support (USD, EUR, GBP)
✓ Refund handling with NFT burn
✓ Express API with full TypeScript types

fiat-onramp-bridge.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

/// @title Fiat Onramp Bridge
/// @notice Stripe-to-crypto bridge for purchasing subscription NFTs with card.
contract FiatOnrampBridge {
    address public immutable owner;
    uint256 public constant VERSION = 1;

    event Initialized(address indexed deployer);

    constructor() {
        owner = msg.sender;
        emit Initialized(msg.sender);
    }

    // ... full implementation in purchased package
}