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Authorized use only. Use this tool solely on systems, tokens, and assets you own or are explicitly permitted to test — credential extraction, signature forging, and unauthorized access are prohibited by our Acceptable Use Policy.

EVM Tools

Blast Developer Tools

Optimistic Rollup with native yield for ETH and stablecoins. Standard EVM — all tools compatible.

Chain details

Chain ID

81457

Native token

Ether (ETH)

Type

L2

Gas

Native yield on deposited ETH and USDB

RPC endpoint

https://rpc.blast.io

Block explorer

https://blastscan.io

Tools for Blast

Every tool below works on Blast and every other EVM chain — read any Blast contract, decode Blast calldata before signing, or convert wei to ETH with exact math. All client-side — keys and payloads never upload.

EVM Contract Reader

Call view functions on any Blast contract via your own RPC

EVM Calldata Decoder

Decode Blast transaction input — function and arguments, before you sign

Transaction Decoder

Break out a signed Blast transaction: sender, gas, fees, calldata

ABI Encoder & Decoder

Encode calldata for Blast contract interactions

Function Selector Calculator

Compute 4-byte selectors for function signatures

EVM Unit Converter

Convert wei, gwei, and ETH with BigInt-exact math

Vanity Address Generator

Generate custom addresses — same key works on Blast and every EVM chain

Address Checksum (EIP-55)

Validate and checksum Blast addresses to catch typos

CREATE2 Address Calculator

Derive deterministic contract addresses before deploying to Blast

EIP-1967 Proxy Slot Checker

Read implementation and admin slots of Blast proxies

Storage Slot Calculator

Compute Solidity storage slots for Blast contract state probes

Uniswap Math Calculator

v2/v3/v4 pool math — amounts out, ticks, sqrtPrice

Uniswap v4 Hook Calculator

Map hook addresses to their permission flags

Keccak-256 Hasher

Hash with the exact algorithm used by the EVM

Multi-Chain Wallet Generator

Generate keys and Blast addresses from one mnemonic

ENS Namehash Calculator

Derive EIP-137 namehash values for ENS names

Solidity to Opcodes

Compile Solidity and inspect the EVM assembly

Popular tokens on Blast

USDB

0x4300000000000000000000000000000000000003
18 dec

WETH

0x4300000000000000000000000000000000000004
18 dec

BLAST

0xb4449E48Ff2963A37975c39fDa493D9c8b839249
18 dec

Other EVM chains

All tools work on every EVM chain — pick yours:

Ethereum

ID 1

Arbitrum

ID 42161

Base

ID 8453

Optimism

ID 10

Polygon PoS

ID 137

BNB Smart Chain

ID 56

Avalanche C-Chain

ID 43114

zkSync Era

ID 324

Linea

ID 59144

Mantle

ID 5000

Cronos

ID 25

Ritual

ID 1979

HyperEVM

ID 999

Katana

ID 747474

Monad

ID 143

Robinhood Chain

ID 4663

Unichain

ID 130

Stable

ID 988

Tempo

ID 4217

World Chain

ID 480

About the Blast

Blast is an Ethereum L2 with native yield: ETH and stable balances earn yield automatically inside the chain itself, and gas is reimbursed through Blast Points and Blast Gold incentive programs. It runs the standard EVM instruction set, so the same addresses, ABI encoding, and Keccak-256 tooling you use on Ethereum mainnet work unchanged.

This page curates Formatho tools configured for Blast (chain ID 81457): read and verify smart contracts before you interact with them, check token approvals that swap routers request, convert between wei and ETH for gas math, and decode calldata to see exactly what a swap or bridge transaction will do — all client-side, no wallet connection, nothing signed.

How to use

  1. Paste any Blast contract address into the Contract Reader with the Blast RPC to inspect tokens, routers, and pools.
  2. Before approving a token swap, decode the router calldata with the ABI Encoder to see the exact path and amounts.
  3. Use the EVM Unit Converter for gas and output-amount math in wei.
  4. Generate or checksum addresses — identical on Blast and every EVM chain.

Frequently Asked Questions

How do token swaps work on Blast? ▾

Token swaps on Blast run through the same AMM model as Ethereum: you approve a router contract to spend your token, then call a swap function that executes against liquidity pools. Blast uses ETH for gas (auto rebasing to stETH yield) and USDB as the yield-bearing dollar. Because it is fully EVM-compatible, the same UniswapV2/V3-style router interfaces and ABI encoding apply — you can decode any Blast swap calldata with the tools on this page before signing.

What is the Blast chain ID and RPC? ▾

Blast mainnet is chain ID 81457 with the public RPC https://rpc.blast.io. Testnet (Blaster) is chain ID 168587773. Wallets and tooling that accept custom EVM networks connect with these values.

Is swapping tokens on Blast safe? ▾

The chain itself inherits EVM security semantics, but the risks live in the contracts: unlimited approvals, malicious or fee-on-transfer tokens, and counterfeit versions of bridged assets. Before swapping, verify the token contract address with a contract reader, check what the router is asking you to approve, and prefer per-swap exact amounts over unlimited approvals. Never sign transactions for addresses you have not verified.

Why do these Blast tools never ask for my wallet? ▾

Every tool here is read-only and client-side: contract reads are plain eth_call requests that cannot move funds, and everything else (ABI encoding, calldata decoding, unit conversion) is local math in your browser. There is nothing to connect and nothing that can sign — which makes the tools safe to use while you research a swap.