Current "Default" Rules for the regular Bitcoin client (Bitcoin 0.3.20):
0.01 BTC fee if sending any transaction less than 0.01 BTC. This is to help prevent >DoS attacks against the network. Remember: fees are not network-enforced, so it's still >possible to send these small transactions without the fee -- you just have to generate >the blocks that contain them yourself (after modifying Bitcoin).
Note that if you want to send a transaction with less than the "default" rules, or if you are a miner and want to include them in your blocks, you may need to peer with the Free transaction relay network.
[^] # Re: Arnaque ou pas ?
Posté par C. OB (site web personnel) . En réponse au sondage Que pensez-vous des bitcoins ?. Évalué à 1.
https://en.bitcoin.it/wiki/Transaction_fees: