The finalization of the trade is pending approval by Beltran himself, but this is seen as just a formality, as Beltran has already stated he wants to join the Giants.
Fox Sports National Baseball Writer Jon Morosi is reporting via Twitter that the Giants are offering minor league prospect Zack Wheeler as part of the deal to acquire the Mets outfielder.
ESPN's Tim Kurkjian and Buster Olney, confirm the same.
The Giants had previously stated that they did not want to give up top prospects for what could amount to a two-to-three-month rental player that would seek a large free-agent contract following season's end, but that position appears to have changed.
Beltran, considered the top trade-deadline prize, is currently hitting .289 with 15 home runs and 66 RBI for the Mets.
If these rumors are true, it signifies a drastic shift in the trade philosophy of the defending world champions.
While it's anyone's guess as to why this change in thinking may be occurring, one possibility is that San Francisco's offensive woes continue.
The Giants were beaten by the Philadelphia Phillies in the opener of a three-game NLCS rematch last night, 7-2, as the Giants were held to just three hits by Phillies surprise right-hander Vance Worley.
One source cited in the ESPN report says he is "95 percent sure" that the deal would get done by the July 31 trade deadline.