Speas was claimed off waivers by the Astros on Friday, Julia Morales of AT&T SportsNet Southwest reports.
Speas was designated for assignment Wednesday by Oakland after just over a month with the team, but he has quickly found a new home. The right-hander has appeared only at the Triple-A level so far this year, logging an 11.32 ERA and 2.28 WHIP across 10.1 IP with Las Vegas.