Fantom Block Explorer

WHAT IT DOES

Fantom Block Explorer is a read-only blockchain analytics tool built specifically for the Fantom Opera network. It provides comprehensive visibility into Fantom on-chain activity including native FTM transactions, ERC-20 token transfers, ERC-721 NFT transfers, contract interactions, wallet balances, and detailed transaction receipts. The tool retrieves full transaction details with gas costs calculated using effectiveGasPrice (not the pre-EIP-1559 gasPrice cap), and automatically detects and displays token transfers from transaction logs. It shows Opera-specific data such as gas usage and effective pricing, giving users a complete picture of their Fantom activity.

HOW TO USE

Select the desired Fantom network (Fantom Opera Mainnet or Fantom Testnet) from the dropdown menu. Enter a transaction hash to view complete transaction details including status, gas usage, effective gas price, total cost, and any token transfers embedded in the logs. Enter a wallet address to view its FTM balance and a summary of recent ERC-20 and ERC-721 transfers organized by token contract. Enter a token contract address to view its transfer history—the tool will automatically detect it as an address lookup and show transfers involving that contract. Each result includes direct links to FTMScan for deeper investigation.

TECHNICAL MECHANISM

The tool uses ethers.js v5.7.2 to connect to Fantom via either the connected wallet's provider or a public RPC endpoint (rpc.ftm.tools for mainnet, rpc.testnet.fantom.network for testnet). For transaction lookups, it fetches the transaction, receipt, and block data, then parses logs to extract token transfers using the standard ERC-20/ERC-721 Transfer event signature (0xddf252ad...). For address lookups, it retrieves the native FTM balance and then uses chunked log scanning with automatic backoff to fetch token transfer events involving the address. The log scanner starts with 2000-block chunks and halves the chunk size on RPC rejection, ensuring public RPC limits are respected. Gas costs are calculated using receipt.effectiveGasPrice, which accurately reflects actual spend post-London upgrade.

WHAT IT CANNOT SEE

This tool cannot track cross-chain Fantom transfers beyond the Opera chain—once funds bridge to Ethereum or other chains, they are outside its scope. It cannot verify off-chain transaction status or detect transactions that have not yet been broadcast to the network. It is limited to Fantom Opera data only and cannot detect tokens that do not follow the standard ERC-20/ERC-721 event interfaces (e.g., tokens using non-standard transfer signatures, or proxy patterns with different event emitters). It also cannot detect transactions on the Fantom testnet that have been dropped or remain in the mempool.

PLEASE NOTE

This tool is EVM only and specifically designed for Fantom Opera (mainnet and testnet). No other chains are supported. All data is read-only—no transactions are signed or sent.