The OKX MCP Playground is an MCP server that provides Claude with access to various blockchain data and market price data through the OKX API. It exposes a suite of tools organized into Balance, Gateway, Index Price, Market Price, Trade, and Transaction operations. Balance Operations allow querying supported chains, retrieving token balances for addresses across chains, and computing the total balance and value of an account. Gateway Operations enable broadcasting transactions, estimating gas limits and prices, retrieving transaction orders, and simulating transactions. Index Price Operations let Claude query supported chains, historical index prices for tokens, and token index prices derived from multiple data sources. Market Price Operations provide access to supported chains, recent trades, batch token prices, candlestick histories, and current token prices. Trade Operations cover approvals, swaps, liquidity sources, quotes, swap instructions for various chains, and token lists. Transaction Operations let Claude retrieve transaction histories and specific transaction details by hash. Prerequisites include Node.js v16+, an OKX API key, and Claude Desktop, with installation, configuration, and running steps included.