IDR to USD Converter

This tool performs Indonesian Rupiah (IDR) to United States Dollar (USD) currency conversion by applying current or historical exchange rates. It accepts a numeric amount and two ISO currency codes, returning a converted amount, the rate used, and a timestamp. It is intended for individuals budgeting cross‑currency purchases, freelancers invoicing international clients, and businesses pricing goods or services in USD relative to IDR.

Core logic centers on explicit inputs, deterministic calculations, and clear outputs. Required inputs include amount (numeric, min 0.01), from_currency (ISO code, IDR), to_currency (ISO code, USD); optional rate_date or rate_source selects the data point. Outputs include converted_amount (numeric, 2 decimals by default), rate_applied (numeric), and rate_timestamp. Rounding follows standard financial practice unless overridden.

Use cases cover price quotes, budgeting, and reconciliation. Distinctive value comes from using reliable FX sources, enabling real‑time or historical modes, and exposing the applied rate for auditability. Advanced features include historical rate lookup, optional fee exclusion notes, and the ability to compute multiple conversions in a batch if the API supports it.

Industry standards emphasize ISO currency codes, locale‑aware formatting, and transparent data provenance. Localization decisions cover formatting, languages, and regional conventions for numbers. Assumptions include single pair conversions per run and no added charges; exclusions include bank fees, spreads, and commissions. Edge cases address invalid amounts, unknown currencies, and rate unavailability with fallbacks to the last known rate or a clear error signal.