You're paying $152,000. Run every number off that, including your rent-to-price math and your repair budget on top.
The two terms are different. An assignment fee is what the wholesaler gets for transferring their purchase contract to you, and it's usually paid out of the closing so the seller's side and your side both show it on the settlement statement. A buyer premium is a fee the marketplace charges you, the buyer, for access to the deal, collected at closing and paid to the platform. Some platforms use the premium instead of taking a cut of the wholesaler's fee, some take both, and in loose conversation people call all of it "the dispo fee," which is where your confusion is coming from. Ask for it in one sentence: who is paid what, by whom, at closing.
The practical thing to check next is the settlement statement, not the marketing email. Ask the title or escrow company handling it to send you a draft with every line on it before you wire anything. If the premium isn't on that document, it's being collected some other way and you want to know how. Disclosure requirements and what has to appear on closing paperwork vary by state, so what's normal in one place isn't in another.
Also worth knowing: your comparison to other sales in the area gets harder here, because in roughly a dozen non-disclosure states sale prices aren't public at all, so the "comps" in a marketplace listing may be somebody's estimate. Verify them with a local agent or appraiser before the premium starts looking reasonable.
