Practical guides to exchange rates, currency conversion and crypto prices — and how to build with them using the GetRatesAPI REST API and MCP server.
6 min read
The Model Context Protocol gives AI apps a standard way to call tools. Here are the practical MCP advantages for AI developers, the trade-offs, and when plain REST is still the better choice.
6 min read
Most currency pairs are never quoted directly. Learn how cross rates are calculated through a common currency, where errors creep in, and how to get a derived rate in one API call.
5 min read
Floats quietly corrupt money. Here is how to do currency conversion rounding properly: keep exact decimals, round once at the end, and respect each currency's minor units.
6 min read
Calling a rates API on every page view wastes quota and slows pages. Here is how to cache exchange rates with the right TTL for each use case, and how to fall back safely when the API is unavailable.