Using FMZ to Query Ethereum Data and Inspect Smart Contract Transactions

Summary

This tutorial introduces FMZ as an interface for interacting with Ethereum through an RPC node. It explains the platform setup at a high level, then demonstrates querying an address balance, identifying the connected chain, and retrieving gas-price information. Returned values may be hexadecimal strings in wei, so the tutorial discusses converting them into readable units and warns that ordinary numeric conversion can lose precision for large blockchain values.

Later examples show how to inspect transaction input data and decode calls routed through a Uniswap router, including a swap and a wrapped-ETH withdrawal. The examples use mainnet and testnet contexts and are intended as practical starting points for further exploration. The document is a development guide rather than a trading strategy or performance study. Its results are illustrative, and reliable use depends on the configured RPC endpoint, network, contract details, and careful handling of token units and transaction data.

Key ideas

• FMZ can route Ethereum JSON-RPC calls through a configured web3 connection.
• Balance queries return values in wei, often represented as hexadecimal strings, and require unit conversion for display.
• Chain identifiers distinguish the network connected to the configured RPC node.
• Large blockchain quantities can lose precision if converted carelessly into ordinary numeric types.
• Transaction input data can be decoded to identify router calls and their parameters.

Tags

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.