Reads a DEX liquidity pool directly from the blockchain via JSON-RPC — no third-party data vendor. Auto-detects Uniswap v3-compatible pools (returns fee tier, sqrtPriceX96, in-range liquidity, spot price both directions) and v2-compatible pairs (returns decimal-adjusted reserves and mid price), including token addresses, symbols, and decimals. Supported chains: ethereum, base, polygon. Data is read at the latest block; cached for up to 30 seconds.