Context:
"The tender, for which bids are due by June 10, switches the transaction back to dollars -- the international currency of oil sales - despite the greenback's recent fall in value. Saddam Hussein in 2000 insisted Iraq's oil be sold for euros, a political move, but one that improved Iraq's recent earnings thanks to the rise in the value of the euro against the dollar." [2]
More:
The Real Reasons Why Iran is the Next Target:
Have you tried a dictionary? Neither 'tender' nor 'bid' is particularly obscure.
b
There are only three definitions of the noun ‘tender’here: Definition of tender | Collins English Dictionary
Only the first two definitions of the noun ‘bid’ here can be relevant: Definition of bid | Collins English Dictionary
That should make things easier.
Context is always important; labelling is rarely important.