CoinGecko Pro's x402 onchain API (pro-api.coingecko.com) provides contract-address-based onchain DEX data, including searchable DEX pools and token pricing/market metrics derived from onchain liquidity. It supports network-specific queries (e.g., Ethereum) to return pool metadata, liquidity and real-time token prices useful for DeFi analytics, portfolio valuation and trading automation. At the listed rate ($0.01 per call), it's optimized for token discovery, arbitrage monitoring, and embedding onchain market data into apps and dashboards.