Web3 Development Toolkit - EIP-55, Gas Estimator, Impermanent Loss
Web3 Developer Toolkit: checksum validator EIP-55 (pure keccak256, client-side), Ethereum gas estimator with static presets (D-BT-W3-GAS, no RPC calls), CPAMM pool impermanent loss calculator. All calculations occur in the browser - no data sent to server (D-53-07).
The checksum EIP-55 is an Ethereum standard for making hex addresses human-readable and secure. Based on keccak256 (Ethereum’s native hash function, distinct from SHA3-256 NIST), it converts some lowercase letters to uppercase based on the hash of the address in lowercase. A wallet compatible with EIP-55 will reject addresses with incorrect casing, preventing accidental sends.
The gas estimator uses preset statics [ASSUMED] based on EIP-2028 and Ethereum Yellow Paper. D-BT-W3-GAS: no RPC call to the Ethereum network (no SSRF). The gas units per ETH transfer (21,000), ERC-20 transfer (~65,000) and Uniswap v3 swap (~130,000) are approximations - real costs vary based on contract implementation and protocol evolution.
L'impermanent loss si calcola con la formula CPAMM di Uniswap v2 [ASSUMED]: IL = 2*sqrt(r)/(1+r) - 1, dove r e il rapporto tra prezzo finale e iniziale. E "impermanente" perche si azzera se il prezzo torna al livello iniziale. Questa formula si applica ai pool a rapporto costante (x*y=k); le posizioni concentrate di Uniswap v3 hanno un profilo IL diverso.
Source EIP-55: https://eips.ethereum.org/EIPS/eip-55 [VERIFIED]. Source gas: Ethereum Yellow Paper + EIP-2028 [ASSUMED]. Source IL: Uniswap v2 whitepaper [ASSUMED]. Normative version: WEB3-GAS-PRESETS-STATIC-2026 (valid until 2027-01-01).
Section A - EIP-55 Validator Checksum
Ethereum Address
Insert an Ethereum address and press "Calculate EIP-55 Checksum".
Section B - Ethereum Gas Estimator (Static Presets)
DBT-W3-GAS: preset statics [ASSUMED] - no RPC calls to the Ethereum network (no SSRF). Real values vary based on contract implementation.
Gas Parameters
Select operation and tier gas, then press "Estimate Gas Cost".
Section C - Permanent Loss Calculator (AMM CPAMM)
Concise formula for CPAMM Uniswap v2: IL = 2*sqrt(r)/(1+r) - 1, where r = finalPrice / initialPrice. Applies to constant ratio pools (x*y=k).
Token Prices
Insert initial and current token price, then press "Calculate Permanent Loss".
How to use the Web3 Dev Toolkit
- EIP-55 Checksum - Attach an Ethereum address
Attach an Ethereum address (with or without the 0x prefix, up to 40 hex characters). The validator calculates the EIP-55 checksum via keccak256 and displays the version correctly cased. Use this value in smart contracts to prevent copy-paste errors.
- Gas Estimator - Select operation and price tier
Choose the operation type (ETH transfer, ERC-20, Uniswap v3 swap) and gas price tier (slow/standard/fast). The calculator uses static presets [ASSUMED] - D-BT-W3-GAS: no RPC call to the Ethereum network.
- Impermanent Loss - Enter Token Prices
Enter initial and final token prices in the AMM pool (e.g. Uniswap v2). The calculator applies the CPAMM formula: IL = 2*sqrt(r)/(1+r) - 1, where r = final price / initial price [ASSUMED - Uniswap v2 formula].
- Interpret results
Values are static reference estimates - real costs vary based on EVM state. Permanent loss applies to constant ratio AMM pools; Uniswap V3 concentrated positions may have different profiles.
Web3 Dictionary
- EIP-55
- Standard Ethereum for checksummed addresses via Keccak256. Distinguishes uppercase and lowercase letters to detect typing errors.
- keccak256
- Hash cryptographic function used in Ethereum (Keccak-256, distinct from SHA3-256 NIST). Basis for Ethereum checksum EIP-55 and transactions.
- Gas (Ethereum)
- Unit of computational work on EVM. Each operation has a fixed cost in gas units; the total multiplied by the gas price (in Gwei) determines the cost in ETH.
- Gwei
- 1 Gwei = 10^-9 ETH. Unit used for gas prices. Example: 5 Gwei * 21000 gas = 105000 Gwei = 0.000105 ETH.
- Impermanent Loss (IL)
- Loss of value for an LP in an AMM pool (x*y=k) compared to simple holding of tokens (hodl). "Temporary" because it expires when the price returns to its initial value.
- AMM / CPAMM
- Automated Market Maker with constant output (x*y=k). Uniswap V2 uses this model. Uniswap V3 uses concentrated positions with a different profile.
Frequently Asked Questions
What is the EIP-55 checksum and why is it important?
Ethereum Improvement Proposal 55 (EIP-55) defines a checksum schema for Ethereum addresses based on keccak256. It converts some letters to uppercase in accordance with the address hash, allowing for error detection of digit entry. A compatible EIP-55 wallet rejects incorrect case addresses, preventing sending to wrong addresses.
Why does the Gas Estimator use static presets instead of real-time data?
DBT-W3-GAS: for security (no SSRF risk) and simplicity. Gas presets are reference approximations based on EIP-2028 [ASSUMED]. Real gas varies with contract implementation, mempool state, and protocol evolution. For precise estimates in production, use an RPC provider like Infura or Alchemy.
How does permanent loss formula work?
For a constant ratio AMM (x*y=k, like Uniswap v2): IL = 2*sqrt(r)/(1+r) - 1, where r is the ratio of final to initial price [ASSUMED - Uniswap v2 whitepaper]. With r=1 (no change), IL is zero. With r=4 (price 4x), IL is -20%. The formula is symmetric: r=4 and r=0.25 both give -20%.
Does the calculator send data to external servers?
No. All three tools are client-only. The EIP-55 checksum uses pure TypeScript (no additional npm dependencies) with keccak256 implementation. The gas estimator uses local static presets - D-BT-W3-GAS. The permanent loss calculator only uses JavaScript arithmetic. No addresses or amounts are sent to external servers.
Are gas values up-to-date?
No - preset gas prices are static references [ASSUMED] with a recorded update date in NORMATIVE_DATA_VERSION. For real-time gas prices consult Etherscan Gas Tracker or your RPC provider's eth_gasPrice API. This tool provides approximate budget estimates, not for live transactions.