Prevent silent decimal mismatch bugs across EVM chains. Covers runtime decimal lookup, chain-aware caching, bridged-token precision drift, and safe normalization for bots, dashboards, and DeFi tools. Use when handling token amounts across EVM chains, or when a balance, price, or transfer amount is o

EVM Token Decimals Silent decimal mismatches are one of the easiest ways to ship balances or USD values that are off by orders of magnitude without throwing an error. When to Use Reading ERC 20 balances in Python, TypeScript, or Solidity Calculating fiat values from on chain balances Comparing token amounts across multiple EVM chains Handling bridged assets Building portfolio trackers, bots, or aggregators How It Works Never assume stablecoins use the same decimals everywhere. Query decimals() at runtime, cache by (chain id, token address) , and use decimal safe math for value calculations. Examples Query decimals at runtime Do not hardcode 1 000 000 because a symbol usually has 6 decimals somewhere else. Cache by chain and token Handle odd tokens defensively Log the fallback and keep it visible. Old or non standard tokens still exist. Normalize to 18 decimal WAD in Solidity TypeScript with ethers Quick on chain check Rules Always query decimals() at runtime Cache by chain plus token address, not symbol Use Decimal , BigInt , or equivalent exact math, not float Re query decimals after bridging or wrapper changes Normalize internal accounting consistently before comparison or pricing

evm-token-decimals