Precious Metal Exchange Rates
# Metal EUR Today Week Month Year Last Updated
1
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Silver

XAG

13.952405 0.90% 1.53% -0.25% 1.52% 21-Mar-2019 08:33:49
2
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Gold

XAU

1155.291555 0.40% 0.65% 0.03% 3.67% 21-Mar-2019 08:33:49
3
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Palladium

XPD

1412.882245 0.85% 2.92% 4.36% 27.68% 21-Mar-2019 08:33:49
4
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Platinum

XPT

784.73893 0.86% 4.25% -0.34% 10.46% 21-Mar-2019 08:33:49

To limit the API calls to the Uphold server, I store the received information in my database and only retrieve new exchange rates after 15 minutes has passed.