Is it permissible to rent out financial instruments (checks) for a specified fee, knowing that they are money, and does this contradict the principle of the impermissibility of renting out money for interest, and does this fall under the category of usury (riba)?

What we mentioned in Fatwa No. 92867 regarding a halal alternative for selling a bond is that the bondholder should agree with a trustworthy person to collect the bond's value for a known fee. This contract is a lease (ijarah) contract, where the hired person pays the collected bond value to its owner and takes his fee in return for following up on the collection. This is permissible according to Shariah, just like appointing someone to follow up on collecting a debt for you from others for an agreed-upon fee.