Upwork does not support contract rates under $3.00 per hour (including the Upwork Service fee) for hourly contracts.
If you have a current or past contract for less than $3.00 per hour, don’t worry. The minimum doesn’t apply to existing contracts. Rehires by past clients are exempt if they previously hired you at less than the current minimum. Rehires of past freelancers are also exempt if you previously hired them for less than $3.00 per hour.