Transaction fees

As of 2013-11-23:
 * Free = Less than 0.1 mBTC.
 * Free transaction relay is capped at 15k/minute
 * By default free transactions must have a priority of 1 BTC * 144 blocks / 250 bytes.
 * 144 blocks is 1 day if the average block takes 10 minutes.
 * Eligius will add a block which pays at least 40.96 uBTC per 512 bytes.
 * Transactions containing outputs of less than 54.30 uBTC are considered non-standard.

See also:


 * https://en.bitcoin.it/wiki/Transaction_fees
 * https://en.bitcoin.it/wiki/Free_transaction_relay_policy