Web3 Development Services

Sign In With Ethereum (SIWE, EIP-4361) is an authentication standard that lets users authenticate with their Ethereum wallet instead of a password. The flow: the server generates a nonce and a structured message ("I authorize this application to use my account"), the user signs the message with their wallet private key (no transaction, no gas fee just a signature), the server verifies the signature was produced by the claimed wallet address. The result: the user is authenticated as the owner of that wallet address no password, no email required. SIWE is appropriate when: your users already have Ethereum wallets (they are using your DApp or Web3 product), or wallet ownership is a core part of the user identity model (token holdings, on-chain reputation). SIWE can be used alongside traditional authentication users choose to connect their wallet to their existing account to unlock Web3 features.

Token-gated access restricts application features or content to holders of a specific token or NFT. The implementation must include server-side verification: never rely on client-side wallet connection alone, as client-side checks can be bypassed. Next.js middleware or API routes call Alchemy NFT API or The Graph to verify token ownership on-chain before serving protected content or allowing API access. Best practices: always verify on the server (client-side UI can show gated content but API must validate before serving data), cache ownership results for performance (blockchain queries are expensive cache for 5-15 minutes depending on your freshness requirements), use snapshot gating for historical holdings (gate based on token holdings at a specific block number to prevent gaming by purchasing tokens just before access), and provide clear error states when wallet not connected, user does not own required token, or user connected wrong network. ClickMasters implements token gating with server-side verification as standard.