Full-value offers with a deadline
PrizePicks Packs offers 100% of FMV, with 24 hours in the Locker to sell or ship. Trove's homepage says 100% for the first minute, then 93% for an hour, then 90%.
Packz buys back at FMV but sells any card left in your collection for 72 hours back automatically.
Longer windows
Tilt Rips offers 90% of live market value with no extra fees and free vaulting, so there's no forced deadline. Collector Crypt sets a rate per machine, between 85% and 93% of insured value, paid in USDC within 3 days of the pull.
Credit, not cash
DOPA converts unwanted cards to site credit at 100% of value. Packs.com buys cards back for Coins at the estimated resale value shown at reveal, and its Coins can't be withdrawn.
Credit you can only spend on the same site keeps you ripping. If you want money back, prefer a withdrawable payout.
How to compare
Every platform sets its own market value. Before you accept any offer, check recent sold listings for the same card and grade.
None of these terms tell you what a pack will return. They only tell you how you can exit after the rip.