id guess they are using a swap service to make the lightning pmt happen and take a cut when that happens ( do they even have a publically announced lightning node? ), and only worth the money to facilitate if above that amt.
and your guess with river working better is probably correct as they do run their own large, well connected node.
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To follow up on this, I sent $10 worth of sats over Lightning today from River and it worked fine and fast. Coinbase continues to choke.
their entry into lightning was clearly opportunistic larping for dollars due to high fee moment
