Yesterday, the following was discovered with the ever-changing trade status.
When the pin is charged, it is trade-able. When it is in its re-charge period, it is NOT trade-able.
Clearly this keeps the 1 hour charge time in place so ppl can't use it, trade it, use it, trade it, etc. all day long.
No clue if something different is happening today. Try to trade it when you know it is fully charged.