Solana and Base x402 concept tokens experienced a significant rebound on December 20, as reported by Chainthink. Solana-based PayAI surged over 107% within 24 hours, reaching a market cap of $15.08 million and a trading volume of $1.7 million. Meanwhile, Base-based PING increased by more than 77%, with a market cap of $6.9 million and a trading volume of $500,000. The surge follows Solana's recent launch of a Twitter account, 'x402 on Solana,' aimed at developing native payment solutions. Despite the gains, Chainthink highlights the tokens' high volatility and low trading volumes, advising caution as the fear and greed index indicates potential investor apprehension.