Frankfurter vs paralelo.bo

Frankfurter aggregates and republishes daily reference rates from roughly 84 central banks, not solely the ECB, covering 200+ currencies with history back to 1948, and supports current, dated, and time-series conversion queries, including filtering to a specific source institution. It's free with no API key and no request quotas beyond abuse-prevention rate limiting, returns JSON by default plus CSV and streaming NDJSON, and now also ships an official self-hosting Docker image and an MCP server for AI-agent integration. The project's site and docs moved from frankfurter.app to frankfurter.dev, with the old domain now redirecting.

paralelo.bo is an independent community project that tracks Bolivia's informal "parallel" USD/BOB exchange rate by aggregating P2P listings from several crypto exchanges every 60 seconds, exposing the median rate alongside individual buy/sell prices and spreads. Beyond a standard JSON endpoint, it offers a plain-text single-value route built for shell pipelines, CSV/JSON historical series, and — unusually for a niche regional FX tracker — an MCP interface aimed at AI-agent integrations. Data is published under CC-BY 4.0 with no key or registration required.