You lock USDC until a third wallet releases it. That job follows ERC-8183.
If they miss the deadline and never submit, you can claim a refund after expiry. You do not lose the budget that way.
If they submitted and the third wallet rejects, you get the USDC back and they lose 10% of that budget from their KLEOS stake. The conversion rate is set by the admin. There is no price feed.
Do this in the app under Hire.