TokenGate

🛡️ TokenGate: An Access Control System via On-Chain Token Ownership

A back-end system that checks if a given Ethereum wallet holds a specific ERC-20 token, enabling token-based access control for apps, websites, and services.

🚀 Key Features

Wallet Lookup: Accepts any Ethereum wallet address and checks token balance.
Token-Based Access Control: Returns whether the wallet has access based on ownership of a specific token.
Blockchain-Integrated: Uses live data from the Ethereum blockchain via ethers.js.
Flexible Integration: Easy to plug into any frontend, backend, or service requiring token gating.

🎯 Use Cases

Membership Unlocks: Restrict premium features or content to token holders.
NFT Gating: Use ERC-721 ownership for access to exclusive platforms.
Web3 Communities: Manage access to private groups (Discord, Telegram, etc.).
Event Access: Allow entry based on ownership of an event token or ticket.
Paywalled APIs: Enable rate-limited or tiered access based on token quantity.

🧠 Architecture

Express.js: Lightweight Node.js server for API routing and request handling.
ethers.js: Ethereum JavaScript SDK for interacting with smart contracts.
Alchemy / Infura: Remote Ethereum node provider for blockchain queries.
dotenv: Manages API keys and contract configurations via environment variables.

⚙️ Technology Stack

Layer	Technology
API	Express.js
Blockchain	ethers.js
Network	Ethereum (Testnet or Mainnet)
Config	dotenv
Runtime	Node.js 18+

🔌 API Endpoints

`GET /check-access?wallet=0x...`

Returns whether the specified wallet holds the required token.

🧪 Token Logic

Token Standard: Defaults to ERC-20; can be adjusted for ERC-721 or ERC-1155.
Access Check: Uses balanceOf(wallet) to determine ownership.
Zero Knowledge: No login or signature required; pure on-chain lookup.

🛡️ Notes

Easy to extend for tiered access, NFT ownership, or allowlist integration.
Can be deployed on services like Vercel, Railway, or Render.
Ideal for projects needing quick, reliable, token-based access verification.