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by scott_meade 4819 days ago
"In exchange, they would agree to give up some percentage of their gross profit on the transaction."

Sounds just like a commission. If the problem is "marketplace founders are stumped when it comes to capturing any of that value for themselves", then the existing answers include commissions and referral fees. Setting up instant financing in order to have something to take a cut of may be a solution in search of a problem.