Hello,
I will deliver this script in only 2 days for $155 + freee 90 days support offered!
About the workflow, the script will bascially get rates from [login to view URL]~webdev/[login to view URL] and save them and each 4 hours it will use the saved rates to calculate weighted average and post it to Twitter. I can do it using NodeJS, Python, or PHP depending on your need.
Regards,
Stephane