The pain You built an MCP tool that calls a paid API on every invocation. Every agent that knows your server URL can hammer it for free. The polite caller with a real Nostr identity pays the same rate as the bot somebody spun up an hour ago, which is to say nothing. Here is how to stop that, end to end, with a server you can clone and run in the next ten minutes. What you will build A running MCP server with one tool, bitcoin_data , that fetches BTC/USD plus mempool fees from mempool.space. An L
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