UK crypto set up

[nonyabizznez]

Oh dear. 🥴 I have offered to pay Chinese vendor (have used before) in Bitcoin. Quote is in USD. The bitcoin I hold is in GBP. I can manage to convert it to USDC.
Will that arrive at the other end using the address provided?
Do I just overestimate the amount to send?
Sorry to sound so stupid.

If you're using Bitcoin ask the vendor to quote you in Bitcoin this way there's no ambiguity in conversion rates. Otherwise don't introduce a different crypto (USDC) where you're still going to have to deal with a USD quote that needs GBP conversion.

A US customer orders T30 for $100 USD
A EU customer orders T30 for $80.85 GBP

Both customers send 0.00097 Bitcoin.