Web3/Blockchain Tools

Calculate the exact output of a constant-product swap, the price impact your trade causes, the minimum you should accept, and how much a sandwich attacker could extract at each slippage setting.

Validate bech32 and bech32m addresses, decode the witness version and program, and see exactly which character is wrong when the checksum fails.

Assess a cross-chain bridge on its trust model, the value it secures against the cost of compromising it, message verification and operations, and name what you are actually trusting.

Score a self-custody setup across key storage, transaction verification, wallet separation and operational habits, with the practices that cannot be traded against a good score elsewhere.

Calculate the liquidation price, health factor and liquidation penalty for a collateralised loan, and see how far the collateral can fall before a liquidator takes it.

Work out what to set for max fee and priority fee under EIP-1559, what you will actually pay, how much is refunded, and how far the base fee can rise before your transaction stalls.

Check Ethereum addresses against the EIP-55 mixed-case checksum, repair lowercase ones, and see exactly which characters are wrong when validation fails.

Compute the EIP-712 domain separator, type hash and final signing digest for typed data, so you can verify what a wallet is actually asking you to sign.

Convert between human token amounts and the integer base units a contract expects, for any decimals value, with exact arithmetic and the float precision trap made visible.

Compute the four-byte function selector and the full event topic hash for any Solidity signature, with the canonical form shown and the collisions and mistakes that break calldata explained.

Diagnose a stuck transaction from your account nonces, see which transactions are blocked behind a gap, and get the exact replacement or cancellation you need to send.

Convert between Wei, Gwei, and Ether units.

Convert between Ethereum units — Wei, Kwei, Mwei, Gwei, Szabo, Finney and Ether — instantly and precisely. Essential for gas and smart-contract work. Private.

Calculate transaction costs based on gas price and limit.

Build and decode BIP-32 derivation paths, see which address type each purpose produces, and understand why the same seed shows different balances in different wallets.

Generate IPFS Content Identifiers (CID) from text or files.

Calculate the LP tokens you receive for a deposit, your share of a pool, how much new deposits dilute you, and what you would withdraw at any later pool state.

Build a keccak-256 Merkle tree from a list of leaves, get the root to put on chain and a proof for any entry, with the sorted-pair convention and the duplicate-leaf pitfall explained.

Work out an M-of-N multisig threshold from how many signers you have and how many you can afford to lose, showing the loss and compromise tolerance of every combination.

Model an NFT collection launch: mint revenue after gas and platform fees, what buyers actually pay, royalty income at various sale volumes, and the break-even secondary volume.

Assess a proof-of-reserves publication against what it would need to actually demonstrate solvency, covering asset control, liability commitment, completeness and the gaps the method cannot close.

Score a token against the contract powers, liquidity conditions and distribution patterns that make a rug possible, separating what is verifiable on chain from what is only claimed.

Convert between satoshis, bits, millibitcoin and whole bitcoin without misplacing a decimal.

Score a smart contract against the failure classes that actually cause losses, covering access control, reentrancy ordering, rounding direction, oracle manipulation and process.

Work out the exact storage slot for any Solidity state variable, including mapping entries, dynamic array elements and nested mappings, so you can read state directly or check a proxy layout.

Calculate staking returns with compounding, and separate the nominal reward rate from the real return after token issuance dilutes everyone who did not stake.

List the token approvals a wallet has granted and see the value each one exposes, which are unlimited, which are stale, and which should be revoked first.

Check Solidity integer arithmetic for overflow, division truncation and precision loss, with exact big-integer results and the operation order that preserves the most accuracy.

Model whether running a validator pays: hardware and hosting against rewards, commission income from delegators, downtime penalties and the stake needed to break even.

Calculate how many attempts and how much time a vanity address with a given prefix requires, at your hardware rate, and see why the difficulty grows sixteenfold per character.

Validate Ethereum and Bitcoin wallet addresses.