Currency Converter

The currency converter computes the value of an amount in a source currency into a target currency using current exchange rates. It accepts amount, source_currency and target_currency, with an optional rate_source for rate provenance. Conceptually, the engine retrieves a rate for the currency pair; if a direct pair is unavailable, it derives a cross-rate via a base currency. The calculation applies converted_amount = amount * rate_used and formats the result to the configured precision. The tool is beneficial for travelers estimating costs, freelancers billing international clients, and ecommerce teams quoting prices in multiple currencies. Unique value comes from its explicit handling of direct versus cross rates, explicit rate provenance, and deterministic rounding. Core features include real-time or cached rates, ISO 4217 currency support, and precise output formatting. Use cases span price quotes, budgeting, invoice preparation, and financial planning across borders.