If I want to keep an offer for my asset USD@me near the current market rate for USD/XLM how would I go about that?
Do folks just add, remove and update offers non stop? Doesn't that burn up XLM in transactions and fill up the ledger?
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As far as I know, there is no other way at the moment. If you would do 1 operation with base fee per second (which is most probably huge overkill) for one day it would cost you less than 1XLM.
Even at 1 ops/sec it shouldn't be serious problem to the network because it's able to run about 1000 ops/sec.
Also, fees are not going to be burn, but redistributed (to inflation pools).