Spot token price in USD on BSC / BNB Chain, read from PancakeSwap v2/v3, Biswap, ApeSwap pools at call time. Returns priceUsd, the routed pair, backing liquidityUsd, confidence and blockNumber. Requires ?symbol=TICKER (e.g. CAKE) or ?token=0xADDRESS. Errors: 400 missing_symbol|unknown_token, 404 no_reliable_price when pools are too thin, 502 upstream_read_failed. Depth is /liquidity; a size-aware quote is /slippage. Bare = BSC; also /polygon /arbitrum /avalanche /optimism /base.