
Fixer.io
Currencyapi.com
FXRatesAPI
OANDA
XE.com
Open Exchange Rates
Wise
Live exchange rates for 150+ currencies with a built-in FX margin calculator. Convert instantly and export to CSV, JSON or PDF.

The modern platform for creating, sharing, and collaborating on AI prompts. Advanced version control and real-time testing.

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As answered by people managing FXPing.co and Diffyn.
FXPing.co's answer
FX Ping combines a live currency converter with a hidden fee checker that reveals the real cost of your FX transaction. Most tools show you a rate — FX Ping shows you what you're actually losing to markup.
Diffyn's answer:
Addresses workflow and change management on LLM prompts, provide teams with traceability and visualization of tests across multiple models, provide deeper understading into efficiency of these prompts.
FXPing.co's answer
FX Ping is free, requires no account, and has no ads. Unlike XE or Google's converter, it includes a dedicated Fee Checker that calculates the hidden margin embedded in any transaction quote, plus interactive historical charts and daily financial news for major currency pairs.
Diffyn's answer:
Diffyn is the platform that specializes on both change management and multi-model analysis.
FXPing.co's answer
React, hosted on Netlify. Exchange rates sourced from Exchange Rate API and Frankfurter (ECB reference data). Historical news powered by The Guardian API.
Diffyn's answer:
React, Next.js, POSTGRESQL
FXPing.co's answer
Anyone sending money internationally — travellers, expats, freelancers, and small businesses who want to understand the true cost of currency conversion and avoid being overcharged by banks and transfer services.
Diffyn's answer:
Professionals incorporating LLMs or AI tools in their workflow and wants to keep track of changes and test their prompts.
Diffyn's answer:
I started working on Diffyn when I notice that prompting has become an essential part of work across many industries. While there are version control platofrms like github, they are not designed for just prompt management are can be overkill such applications, it is also not integrated natively with various LLMs and relevant tools for users to validate ideas and visualise results properly.
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When comparing FXPing.co and Diffyn, you can also consider the following products.

Fixer provides a free, simple, and lightweight API for current and historical foreign exchange rates and currency conversion. The API tracks rates published daily by the European Central Bank.
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Currencyapi.com is a free, reliable & feature complete currency exchange rates API. 170+ world currencies & 60 second update rate.
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OANDA is an advanced forex and broker trading platform that helps you in currency data, exchange rate services for the investors and organizations.
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XE.com Inc. (XE) is a Canadian online foreign exchange services company.
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Free, hourly-updated exchange rates - a simple, accurate, open-source JSON API. Free for personal use, a bargain for everybody else.
Compare Open Exchange Rates to FXPing.co or Diffyn: