Network and stablecoin fees
For EVM transactions, the base calculation multiplies gas units by gas price. Gwei values are converted to the native asset with 10⁻⁹, then converted to USD with the supplied native-token price. A stablecoin fee percentage divides total USD cost by transfer amount.
Manual stablecoin estimates add exchange withdrawal and provider fees after network conversion. This keeps each layer visible instead of collapsing costs into one unexplained amount.
Precision and validation
All financial arithmetic uses arbitrary-precision decimal values. Inputs are validated for type, range, and required relationships before calculation. Calldata uses Viem, accepts at most 64 KB of ABI data, and never evaluates user input as code.
Live, cached, stale, and estimated data
Manual estimateUser-supplied inputsCalculated locally; available in Phase 1
ReferenceVersioned local datasetReview date is visible; never called live
LiveRecently fetched provider dataRequires explicit user action; not enabled in Phase 1
Cached / stalePreviously fetched live resultFuture API responses will include fetch and expiry timestamps
Model-specific limitations
- Gas-unit presets are approximate and can omit rollup data costs.
- Bridge quotes can change with liquidity, slippage, route, and expiry.
- The liquidation calculator is a general estimate, not an exchange adapter.
- Token dilution scenarios are arithmetic boundaries, not price forecasts.
- A low-fee network rank does not express safety, liquidity, or suitability.
Planned cache policy
- Gas snapshots: 30–60 seconds
- Native token prices: 60 seconds
- Network and stablecoin metadata: 24 hours
- Payment provider references: seven days between review checks
- Bridge quotes: provider-defined short expiry