MCP server

loop-mcp

com.loopxxi/loop-mcp

Checked 25 Oct 2026, 20:29 UTC · Connected to it and listed its tools

15 pay-per-call Bitcoin and developer tools, paid in sats over Lightning (L402).

Website

At a glance

Type

MCP server

Publisher

loopxxi.com (verified by the MCP Registry)

Status

Working at last check

Tools

15

Token cost

About 1,872 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

25 Oct 2026, 20:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http loop-mcp https://mcp.loopxxi.com/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.loop-mcp]
url = "https://mcp.loopxxi.com/mcp"

Gemini CLI

{"mcpServers":{"loop-mcp":{"httpUrl":"https://mcp.loopxxi.com/mcp"}}}

Cursor

{"mcpServers":{"loop-mcp":{"url":"https://mcp.loopxxi.com/mcp"}}}

VS Code

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

Antigravity

agy mcp add loop-mcp https://mcp.loopxxi.com/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"loop-mcp","server_url":"https://mcp.loopxxi.com/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"loop-mcp","server_url":"https://mcp.loopxxi.com/mcp"}

Tools

• base64_convert ~123 tokens
  Encode UTF-8 text to Base64 or decode Base64 safely, with standard and URL-safe alphabets.
• btc_price ~57 tokens
  Get the current Bitcoin price in USD and other major currencies. Source: mempool.space. Real-time.
• btc_send_decision Sends messages · ~183 tokens
  Returns a composited send-or-wait recommendation for a Bitcoin transaction. Fetches live mempool and fee data, then outputs a machine-actionable verdict (SEND_NOW, WAIT, or URGENT_ONLY) with fee rates in sat/vB, mempool pressure level, and estimated savings if you wait. Ideal for agents that need a
• csv_to_json ~172 tokens
  Convert CSV, TSV, semicolon, or pipe-delimited text into structured JSON with bounded row output.
• hash_generate ~128 tokens
  Generate a SHA-256 or SHA-512 digest in hexadecimal or Base64 form.
• json_extract ~108 tokens
  Extract one value from JSON using a simple dot path with array indexes, for example users[0].email.
• json_validate ~81 tokens
  Validate JSON, identify its root type, and return normalized JSON plus a SHA-256 content hash.
• jwt_decode ~90 tokens
  Decode JWT header and payload claims locally without verifying the signature. The response always marks verification as false.
• lightning_address_resolve ~153 tokens
  Resolve a Lightning Address (user@domain.com) to a payable BOLT11 invoice for a given amount. Handles the full LNURL-pay protocol internally. Returns the invoice plus min/max sendable amounts for validation.
• optimal_send_window Sends messages · ~253 tokens
  Bitcoin transaction timing intelligence. Returns a congestion forecast for the next 1-4h, a recommended UTC send window when fees are projected at/below your target, a fee trajectory (rising/stable/falling) with a calibrated confidence score, next-block minimum fee, confirmation targets for 3/6/144
• text_analyze ~80 tokens
  Return deterministic text statistics, estimated tokens, reading time, and a SHA-256 content hash.
• timestamp_convert ~112 tokens
  Convert Unix seconds, Unix milliseconds, RFC3339, or ISO dates into normalized UTC timestamp forms.
• tx_decode_explain ~159 tokens
  Fetch a Bitcoin transaction by txid and return a structured, agent-ready summary: type (P2WPKH/P2TR/P2SH/etc.), input/output counts, fees, fee rate in sat/vB, confirmation status, RBF flag, SegWit/Taproot flags, and a one-line agent_summary string ready for LLM context injection. Saves 500-2000 toke
• url_parse ~90 tokens
  Parse an HTTP or HTTPS URL into normalized scheme, host, port, path, query, and fragment fields without fetching it.
• uuid_generate ~83 tokens
  Generate one to one hundred cryptographically random RFC 4122 UUID version 4 identifiers.

Browse

• Spreadsheets
• Email
• Payments
• Invoicing and accounting

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