ETage-Messtone initial request to the Metals-API will create an ETag object as follows`ETag:”202567a75aef2e66a3ebf2366bff048f” Date: Mon,12 April 2018 11:30:01 GMT If-None-Match: “1872ade88f3013eded33decd74a4f947” If-Modified-Since: Fri,10 Apr 2015 12:10:04 GMT {“success”:false,”error”:{“code”:104,”info”: “Messtone monthly API request volume has been reached.Please upgrade messtone plan.”}}Error Code Description API Request: https://metals-api.com/api/symbols?access_key=API_KEY Request Parameters: Parameter Description API Response:{“success”:true,”symbols”:{“AED”:”United Arab Emirates Dirham”,”AFN”:”Afghan Afghani”,”ALL”:”Albanian Lek”,”AMD”:”Armenian Dram”,[…]}} Response Objects: Response Object Description Latest Rates Endpoint API Request: https://metals-api.com/api/latest?access_key=API_KEY&base=USD&symbols= GBP,JPY,EUR Request Parameters: Parameters Description API Response: {“success”:true,”timestamp”:1519296206,”base”:”USD”,”date”:”2018-09-10″,”rates”:{“GBP”:0.72007,”JPY”:107.3446001,”EUR”:0.813399,}} Response Objects: Response Object Description API Request https://metals-api.com/api/2013-12-24?access_key=API_KEY&base=GBP&symbols=USD,CAD,EUR Request Parameters Parameters Description API Response:{“success”:true,”historical”:true,”2013-12-24″,”timestamp”:1387929599,”base”:”GBP”,”rates”:{“USD”:1.636492,”EUR”:1.196476,”CAD”:1.739516}} Response Objects: Response Objects Description https://metals-api.com/api/latest?access_key=API_KEY&base=USD&symbols=XAU-BID,XAU-ASK