MCP guides

Pay-per-call tools over MCP at https://grokzilla.shop/mcp (Streamable HTTP, no API key). Paid tools settle in USDC on Base with x402; list_skills and get_skill are free.

• Your agent pays for a tool call in 30 seconds: Add grokzilla.shop/mcp to an MCP client and make one paid tool call with @x402/mcp: USDC on Base via x402, no API key or signup. A tested script with real output and a Base transaction hash.
• A paid MCP tool call, step by step: Captured requests and replies for a paid MCP tool call on grokzilla.shop: initialize, tools/list, the x402 PaymentRequired challenge inside the tool result, the paid retry, and when nothing is charged.
• Capping what your agent spends: Check every x402 challenge before signing, set a per-call cap and a daily budget in @x402/mcp, and know when you're not charged. Published limits: $0.25 per call, $0.50 per session.

Also: MCP quickstart · HTTP quickstart · pricing