ExchangeRate-API

FXProof is a B2B SaaS for creating signed, verifiable proof documents for official exchange rates. Each reusable proof bundle preserves the selected official source, rate date, dataset details, document ID, payload hash, signature status, and public verification data. It helps accounting and finance teams, bookkeeping and tax practices, auditors, compliance teams, small businesses, freelancers, and software providers document the exchange rate used for invoices, expenses, accounting entries, tax files, internal controls, audits, and dispute reviews. Supported sources include the European Central Bank, HMRC, the Federal Reserve, the Bank of Canada, and the National Bank of Kazakhstan. Users can view proof samples, verify an existing document without an account, retrieve ready proof bundles in the web application, and automate the same workflow through the API. FXProof is not a currency exchange, trading platform, or provider of investment, legal, accounting, or tax advice.

CurrencyFreaks is a REST API for real-time and historical currency exchange rates, covering 1,000+ currencies plus metals and major cryptocurrencies. Returns JSON or XML, so it fits any backend without extra parsing work. Core features: - Live rates updated as often as every 60 seconds on higher plans - Historical rate data for trend analysis and reporting - Currency conversion endpoint for direct amount conversion - IP to Currency endpoint detects a visitor's local currency - Time Series and Fluctuation endpoints track rate movement over a date range - Scalable, bulk-friendly endpoints for high-volume apps Plans range from a free tier (1,000 calls/month) up to 550,000 calls/month with 60-second updates on the Professional plan. Built for fintech platforms, e-commerce, accounting software, and any app that needs reliable currency data without maintaining its own rate feed.