External users from mainnet can buy tokens IOUT for crypto money via bridge and place orders on exchange.
They can look for other IOUs by keywords in the description and place the buy orders for these tokens.
Borrowers can list their (and anybody's) IOU tokens that they have, on IOU.deals exchange, and make sell orders, in ethereum POA net, with anchoring every block in public testnet.
Users of exchange can place orders for a type of service (as painting, programming, writing, etc).
They pay for placing IOUT tokens, that they have to buy for their tokens or for crypto money.