A few things that help:
- The estimated quote is shown before you confirm, and execution never settles worse than your slippage tolerance - so review the quote and price impact before signing, especially off-hours.
- For less-traded names, smaller trade sizes typically receive better pricing than one large order.
- Pricing on thin names generally tightens when US markets reopen; if a quote looks unusually wide, checking again during US trading hours will usually show a better price.