ERC-404 is an experimental token standard on Ethereum that merges two older standards — ERC-20 for fungible tokens and ERC-721 for NFTs — so a single asset can behave as both a tradable coin and a unique collectible. Buy a…

A soulbound token is a token you cannot sell, trade, or send to anyone else. Once it lands in your wallet, it stays there. That one rule — no transfers — is what sets it apart from nearly every other…

ERC-6551 is an Ethereum standard that gives every existing NFT its own smart contract wallet, without changing the NFT or its contract. Each NFT gets a dedicated account that can hold tokens, own other NFTs, and sign transactions — and…

ERC-4626 is a standard interface for tokenized vaults: smart contracts that take a deposit of one ERC-20 token, issue “share” tokens that represent a claim on the pool, and let holders redeem those shares later for their portion of the…

An AI agent can reason about code, but it cannot see what happened on Ethereum five seconds ago. To give it that sight, you build an MCP server: a small program that exposes blockchain actions as tools the agent can…

A real-time Hyperliquid whale alert bot is a small program that listens to the exchange’s live trade feed, keeps only the trades large enough to matter, and sends you a notification the moment one happens. You can build a working…

Flashblocks are 200-millisecond pre-confirmations on Base. Instead of waiting the full two seconds for a block, your app learns that a transaction will be included in about a tenth of that time, then updates the interface before the block is…

Bitcoin Ordinals let you attach data — an image, a line of text, even a small program — to a single satoshi, turning it into a one-of-a-kind artifact that lives on-chain. Bitcoin Runes do something different: they create fungible tokens…

A copy trading bot is a program that watches one wallet and automatically mirrors its trades into your own account. You pick a trader who is good at something, and the bot copies what they do in close to real…