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I have two questions, both about sendmany.
First, is there any limit on how much transactions can I send with sendmany? (Apart from bash's limit with maximal parameter length.) Is sending about 500 transactions OK?
Second, what will be the fees used when I send a lot of transactions (and thus, probably creating a big transaction)?
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You can calculate your transaction size before sending the transaction. Here's some more info on that:
How to calculate transaction size before sending
A single transaction isn't limited to how many outputs it has, rather, there are some limits to how big a block is. You can read more here:
How many different destinations can a single transaction have?
EDIT:
After calculating the size, you can further calculate fees by using this method (it takes into account some code in main.h):
That is interesting. I would guess the fees are then added based on "recommended" values and the size, right? – Karel Bílek – 2014-03-02T08:11:15.463
I am accepting this answer, but if someone answers the part about fees I will be glad. – Karel Bílek – 2014-03-02T19:39:02.470
1 Sorry, I forgot to link this thread: http://bitcoin.stackexchange.com/questions/3400/what-is-the-exact-formula-for-calculating-transaction-fees
I would also like to know. Someone? – None – 2014-03-01T04:51:40.413
The upvote function is there for this very reason. Please don't use the answer field for this type of comment. – bvpx – 2014-03-01T06:54:41.933
This does not really answer the question. If you have a different question, you can ask it by clicking Ask Question. You can also add a bounty to draw more attention to this question once you have enough reputation.
– Murch – 2014-03-01T09:26:50.033