The assessment is primarily based on a single, highly relevant source which strongly supports the claim. A social media feed that aggregates new crypto listings explicitly states that a Bybit pre-market listing for WETUSDT is scheduled for December 4, 2025. A pre-market listing is a common precursor to a full spot market launch. The claim's date of December 9, 2025, for the spot trading launch is a highly plausible and logical follow-up, occurring five days after the pre-market event. This timeline is consistent with standard industry practices for new token listings on major exchanges. Although the source has moderate authority (0.50), its high relevance (0.90) and the specificity of the information give it significant weight. None of the other provided sources directly contradict this information. While other sources mention Bybit, HumidiFi (WET), or the December 2025 timeframe, they do so in different contexts and do not offer conflicting evidence. The absence of contradiction, combined with the strong, specific, and chronologically logical evidence from the listings feed, makes the statement highly probable.