onchain logic
Sepolia smart contract
kernel
a Solidity contract deployed to Ethereum Sepolia via MetaMask private key, then verified on Etherscan
how it drives the UI
a 'verified onchain' badge with the live contract address and an Etherscan link
Four onchain primitives, demystified.
Every idea in this repo leans on one of four web3 primitives. Each one runs against Ethereum Sepolia (a free, real testnet) so you can ship a verifiable demo with zero hosting and zero gas spent by your users.
The five secrets
Add these in your Lovable project (Settings → Secrets) before pasting any mega-prompt:
250 ideas use this
decentralized storage
IPFS via Pinata
kernel
a Pinata JWT upload that pins images / JSON / manifests to IPFS and returns a permanent CID
how it drives the UI
a 'pinned to IPFS' chip with the CID and an ipfs.io gateway preview
wallet UX
Privy social + sponsored tx
kernel
Privy embedded wallet bootstrapped with PRIVY_APP_ID — Google sign-in plus sponsored transactions so users never see gas
how it drives the UI
a one-click 'Sign in with Google' that drops the user straight into the app with an onchain identity
onchain authorship
NFT provenance mint
kernel
an ERC-721 contract on Sepolia that mints a creator-owned token pointing at an IPFS CID, verified on Etherscan
how it drives the UI
a 'mint to claim authorship' button that returns the tokenId, owner address, and Etherscan link
x402 native
Ethereum Sepolia + x402 paywall
kernel
an x402 v2 paywall that meters access with 0.01 USDC per call via EIP-3009 authorization, signed by an external MetaMask EOA (connected through Privy) and settled by a self-hosted facilitator on Ethereum Sepolia
how it drives the UI
a 'pay 0.01 USDC to unlock' button that returns the Sepolia tx hash and links straight to Etherscan