PriceDB is a repository that is getting updated every day with the prices of currencies, gold, etc in IRR (Iranian Rial).
Documentation for the API can be found on prices.readme.io. For example to get the price of USD in IRR you can use the following curl command:
Using Curl:
curl https://api.priceto.day/v1/latest/irr/usd
Or in PowerShell:
$(Invoke-WebRequest 'https://api.priceto.day/v1/latest/irr/usd').Content