Reference
Standards, constants, and address directories worth bookmarking: Multicall3 deployments, Chainlink feed addresses, proxy storage slots. Written once, checked often.
What is ERC-20? Tokens and approvals
ERC-20 is the standard that makes fungible tokens behave the same way everywhere. It defines balances, transfers and approvals, so any wallet can use a token.
What is gwei? Gas fees and EIP-1559
Gwei is one billionth of an ether and the unit gas prices are quoted in. Since EIP-1559, each transaction pays a burned base fee plus a tip to the validator.
What is the EVM (Ethereum Virtual Machine)?
The Ethereum Virtual Machine (EVM) is the shared engine that runs smart contracts. EVM compatible chains such as Base and Polygon run the same contracts.
What is wrapped bitcoin? WETH and WBTC explained
A wrapped token stands in for another asset at a one-to-one rate. WETH is ETH held in a smart contract, and WBTC is a claim on Bitcoin held by a custodian.
ERC-20, ERC-721, and ERC-1155 ABI JSON (Copy-Paste Reference)
The ERC-20 ABI in JSON, plus ERC-721, ERC-1155, and WETH9, each with the human-readable viem form, function selectors, and what's optional versus required.
What Is a Smart Contract ABI? JSON Format, Examples, and Where It Comes From
A smart contract ABI is the JSON interface describing a contract's functions and events, generated by the compiler and used to encode calls and decode results.
ERC-1155 URI and Metadata: The {id} Substitution, the JSON Schema, and Total Supply Explained
How ERC-1155's uri() function, the {id} hex substitution rule, the metadata JSON schema, and totalSupply(uint256) actually work, with a worked example and the correct ABI source.
Querying Polygon Contracts with evmquery: Chain ID, Proxy Resolution, and a Live Example
evmquery now reads Polygon (evm_polygon, chain ID 137) contracts through REST, MCP, and n8n — same ABI resolution and proxy unwinding as Ethereum, Base, and BNB Chain.
Multicall3 in 2026: The Practical Guide to Batching EVM Contract Reads
Multicall3 lets you collapse hundreds of RPC roundtrips into a single call. This guide covers how it works, Viem / Ethers / Wagmi usage, common pitfalls, and when to hand it off.