Onyx is a Swiss intelligence gathering system maintained by the Federal Intelligence Service - Nachrichtendienst des Bundes (NDB). The costs of the system are not public, but the amount of 100 million Swiss francs has been mentioned several times, in particular in 2000 by Werner Marti, SP deputy to the National Council (Switzerland). In March 2005, journalist Urs Paul Engeler estimated that the costs reached 400 million CHF. The Onyx system was launched in 2000, originally under the name SATOS-3, and was completed in late 2005.

Leuk is a municipality in the district of Leuk in the canton of Valais in Switzerland. On 1 January 2013, the former municipality of Erschmatt merged into the municipality of Leuk.