Question 1

How to set up caching with Swap to reduce API calls?

Accepted Answer

Swap supports PSR-6 or PSR-16 compatible caches configured via the Builder. This caches exchange rates to minimize external requests, improving performance for frequently accessed pairs, as detailed in the documentation.

Question 2

Swap vs directly using Fixer API: which is better?

Accepted Answer

Swap abstracts multiple providers and adds fallback support, making it more reliable than a single API. However, if you only need one provider and want minimal dependencies, direct API calls might be simpler and faster to implement.

Question 3

Does Swap support real-time cryptocurrency prices?

Accepted Answer

Yes, but limitedly through services like coinlayer and Cryptonator, which focus on crypto with some standard currencies. For extensive crypto coverage, you might need to implement a custom service or use a specialized provider.

Question 4

How to add a custom exchange rate service in Swap?

Accepted Answer

Implement the ExchangeRateService interface and register it via the Builder. This allows integrating proprietary data sources while maintaining Swap's unified interface, as mentioned in the extensible design feature.

Question 5

What are the free usage limits for Swap's providers?

Accepted Answer

Providers like Fixer and currencylayer offer free plans with up to 100 requests per month. For higher volumes, paid plans are required, which Swap can integrate, but you'll need to manage API keys and costs accordingly.

Question 6

How to handle API key rotation or expiration in Swap?

Accepted Answer

Swap doesn't handle key rotation automatically; you need to update configuration manually or use environment variables. For dynamic setups, consider implementing a custom service wrapper to manage keys programmatically.

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