solidityethereumintermediate
ERC-721 Enumerable NFT
An ERC-721 with Enumerable extension, allowing on-chain iteration of all minted tokens.
nft
Code Snippets
Annotated, copy-pasteable blockchain code examples in Solidity, Vyper, Rust, and JavaScript.
18 snippets
rustmultibeginner
Soroban Hello World
A minimal smart contract for Stellar's Soroban platform written in Rust.
infrastructure
typescriptethereumadvanced
Batch Read with Multicall
Batch multiple contract reads into a single RPC call using viem's multicall.
integration
pythonbeginner
Keccak256 Hashing (Python)
Compute Keccak-256 hashes in Python, matching Solidity's keccak256 function.
security
vyperethereumbeginner
Vyper ERC-20 Token
A minimal ERC-20 token implementation in Vyper, showcasing Vyper's clean syntax and built-in overflow protection.
tokens
typescriptethereumintermediate
Deploy Contract with viem
Deploy a smart contract using viem with bytecode and ABI.
infrastructure
rustsolanaintermediate
Anchor Program — Solana Counter
A Solana counter program using the Anchor framework with PDA-based state storage.
infrastructure
solidityethereumintermediate
NFT Royalty Enforcement (ERC-2981)
Implement ERC-2981 royalty standard to inform marketplaces of creator royalties.
nft
typescriptsolanaintermediate
Solana Token Transfer (TypeScript)
Transfer SPL tokens between wallets using @solana/web3.js and @solana/spl-token.
integration
typescriptethereumadvanced
Merkle Tree Whitelist
Generate a Merkle tree for whitelist verification and verify proofs on-chain.
security
typescriptethereumexpert
ERC-4337 Account Abstraction
Send a UserOp through an ERC-4337 bundler using viem and permissionless.
infrastructure
pythonadvanced
HD Wallet Derivation (Python)
Derive hierarchical deterministic (HD) wallet addresses from a mnemonic using BIP-32/BIP-44 in Python.
security
solidityethereumintermediate
Chainlink Price Feed (Solidity)
Read token prices from Chainlink price feeds in a Solidity contract.
integration
pythonintermediate
Merkle Proof Verification (Python)
Build a Merkle tree and verify proofs in Python for whitelist verification.
security
solidityethereumadvanced
ERC-4626 Tokenized Vault
A standard ERC-4626 tokenized vault that accepts deposits, issues shares, and accrues yield from an underlying strategy.
defi
solidityethereumintermediate
Simple Staking Contract
A basic staking contract where users stake tokens and earn rewards proportional to their stake.
defi
rustmultibeginner
CosmWasm Counter Contract
A simple incrementing counter smart contract for CosmWasm / Cosmos chains.
infrastructure
typescriptethereumintermediate
Estimate Gas with viem
Estimate gas for contract interactions and check balance before sending.
integration