Why don't you take the requests and cache it locally? that way when folks run to your site with a valid request you can hit your local cache. Albeit only allowing it to be refreshed every x interval ?
Actually I request the API data every minute with a cronjob and write it to a file which my users access. (Is there a better solution? thought it's ok).
But still, with the worldcoinindex API I could refresh only every 5 minutes.
Edit: fiat prices are now calculated from poloniex price too.
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