IBKR offers the ability to Direct-route Pink/OTC orders to ArcaEdge and OTCLNKECN. The other OTC market centers IBKR uses for Pink/OTC execution services are Citadel Pink and Nite which are not available as Direct-routing Destinations but are available via SMART-routing.
ArcaEdge and OTCLNKECN will accept and hold a non-marketable Pink/OTC order if they are actively quoting that symbol. CitadelPink and Nite will only accept a marketable order on their Bid/Ask or an order that meets the Minimum Quote Size (MQS) requirements. Please note that market makers at a specific OTC market center may not always continuously quote a Pink or OTC symbol. For example, OTCLNKECN may not start quoting a symbol until after 09:30 EST. In this case, a Direct-routed order could not be re-routed to any other OTC market center that may have started trading that symbol at 08:00 EST.