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Loop MCP Server

@Loop-XXI

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基本情報

カテゴリ

その他

ライセンス

MIT

作者

Loop-XXI

Loop MCP Server について

L402-native MCP payment proxy: 5 paid Bitcoin/Lightning tools for AI agents, 10-25 sats/call.

Loop MCP Server の設定

以下の設定を使って、このサーバーを MCP 対応クライアントに追加してください。

{
  "mcpServers": {
    "loop-mcp": {
      "type": "streamable-http",
      "url": "https://mcp.loopxxi.com/mcp"
    }
  }
}

Loop MCP Server のツール

ツール一覧はまだありません

この掲載には表示できるツール一覧がまだありません。サーバーにツールがないという意味ではありません。対応機能はプロジェクトのドキュメントをご確認ください。

上のボタンでサーバーのエンドポイントに接続し、ツール一覧を取得できます。

概要

What is loop-mcp?

loop-mcp is a payment-aware transport for the Model Context Protocol (MCP) that charges AI agents per tool call over two rails: Bitcoin/Lightning via L402 or USDC via x402, and settles both into one canonical ledger. It is built and maintained by Loop XXI LLC and is API-compatible with x402-only MCP transports, adding Lightning as a first-class second rail. It is intended for developers who want to make MCP tools payable and for agents that need to pay per tool call.

How to use loop-mcp?

Use the hosted deployment at https://mcp.loopxxi.com/mcp (no install required) — point any MCP/L402 client at it. Alternatively, embed the dual-rail transport into your own MCP server by installing @loop-xxi/loop-mcp from npm and calling makePaymentAwareServerTransport with per-tool USD prices and optional Lightning provider configuration. The agent flow is: challenge (HTTP 402 with invoice) → pay invoice → retry with Authorization: L402 <token>:<preimage>. Fiat credits via Stripe use a single Authorization: Bearer loop_<credit_key> call.

Key features of loop-mcp

  • Dual-rail payments — Lightning (L402) and USDC (x402) in one transport.
  • Per-tool pricing — each tool call costs sats or USD (10–25 sats per tool on live deployment).
  • Stateless L402 verification — preimage verified without database.
  • Rail-tagged canonical ledger — both rails settle into one LoopLedger with a rail tag.
  • Free try endpoint — POST https://mcp.loopxxi.com/try/btc_price returns live Bitcoin price for free.
  • Fiat credits via Stripe — buy credit packs ($10/$25/$50) and pay with Bearer token, no Lightning wallet required.

Use cases of loop-mcp

  • Charging AI agents per tool call for premium data (e.g., Bitcoin price, mempool analysis).
  • Enabling Bitcoin-native micropayments for MCP tools without requiring a USDC/EVM wallet.
  • Allowing agents to pay via fiat credits bought with Stripe, avoiding crypto wallets entirely.
  • Running a payment preflight check before spending to avoid over-budget calls.
  • Adding dual-rail (L402 + x402) payment support to any existing MCP server via npm package.

よくある質問

1

What is the difference between L402 and x402?

L402 uses Lightning invoices and preimage verification with the `Authorization: L402 <token>:<preimage>` header; x402 uses USDC on Base with an `X-PAYMENT` header. loop-mcp supports both and tags each row in the ledger with the rail used.

2

Do I need a Lightning wallet to use the hosted deployment?

For the default Lightning rail, yes — you need a wallet that can pay BOLT11 invoices and return the 64‑character hex preimage. Alternatively, you can buy fiat credit packs via Stripe and pay with a Bearer token, no Lightning wallet needed.

3

What are the costs for the live tools?

Each tool costs between 10 and 25 satoshis per call, as shown in the tool table (e.g., `btc_price` = 10 sats, `tx_decode_explain` = 25 sats). Fiat credits are priced in sats at the live Bitcoin price ($10 pack gives 1000 credits → sats).

4

Where does the payment data live?

loop-mcp verifies payments statelessly for L402 (no database) and forwards fiat credit debits to Loop Gateway’s `POST /v1/credits/debit`. The ledger is a `LoopLedger` that can be configured by the server operator.

5

Is there a free way to try a tool before paying?

Yes, the endpoint `POST https://mcp.loopxxi.com/try/btc_price` returns the live Bitcoin price for free, without any payment or wallet — it is a read-only lead‑gen endpoint.

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