WikiLeaks says it has secured a victory in Iceland's Supreme Court against the financial blockade imposed by Visa and MasterCard on donations for the secret-spilling site.

Visa and MasterCard were among half a dozen major U.S. financial firms to pull the plug on WikiLeaks following its decision to begin publishing about 250,000 State Department cables in late 2010.

WikiLeaks said Wednesday that Iceland's Supreme Court upheld a district court's decision that MasterCard's local partner, Valitor, had illegally terminated its contract with WikiLeaks' payment processer, DataCell.

WikiLeaks said the court warned Valitor would be fined 800,000 Icelandic krona ($6,824) per day if the gateway to WikiLeaks donations is not reopened within 15 days.