KmalServico blends multiple independent data sources so no single provider becomes a point of failure.
Spot gold - GoldAPI - Metals.dev - Alpha Vantage (fallback)
Foreign exchange - Frankfurter / ECB reference - exchangerate.host - Open-source open exchange feeds
Reference data - ISO 4217 for currency codes - ISO 3166 for country codes - LBMA and refiner literature for weight and fineness conventions
Provider health (latency, success rate, staleness) is tracked continuously and drives automatic failover.