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+ # spendctl+ > spendctl is the spend-policy control plane for AI agents: budgets, approvals, receipts and chain tracing across every wallet and every HTTP 402 protocol — enforced in a sidecar you run, never by holding your keys or funds.+ Important notes:+ - Agents pay for APIs over HTTP 402 (x402 and MPP). spendctl sits between the agent and the seller as a local sidecar: it enforces a budget per agent, allowlisted hosts and pinned recipients, holds anything above a threshold for a human approval, and writes a receipt for every settlement.+ - The fastest way to see it is the hosted sandbox MCP server at https://mcp.spendctl.dev/mcp (mock money, no login). The local sidecar runs with `npx spendctl init && npx spendctl start` and is free for two agents; Pro and Team add the hosted control plane.+ - Naming: the product is spendctl at https://spendctl.dev, shipped on npm as `spendctl` (`npx spendctl`). Its Python client is `spendctl-sdk` on PyPI; the PyPI package named `spendctl` is an unrelated project.+ - The documentation below is the English source; a Japanese edition lives under https://spendctl.dev/ja/docs/.+ ## Documentation Sets+ - [Abridged documentation](https://spendctl.dev/llms-small.txt): a compact version of the documentation for spendctl, with non-essential content removed+ - [Complete documentation](https://spendctl.dev/llms-full.txt): the full documentation for spendctl+ ## Notes+ - The complete documentation includes all content from the official documentation+ - The content is automatically generated from the same source as the official documentation+ ## Optional+ - [Landing page](https://spendctl.dev/): product overview, pricing and FAQ+ - [Hosted sandbox MCP server](https://mcp.spendctl.dev/mcp): a remote MCP endpoint running a real sidecar against mock paid APIs; mock money, no login+ - [Client SDK on GitHub](https://github.com/miraistudio/spendctl-sdk): Apache-2.0 thin clients+ - [Japanese documentation](https://spendctl.dev/ja/docs/)