All servers · Crypto & blockchain · Utilities

loop-mcp

com.loopxxi/loop-mcp · v2.4.0

Measured by MCP Station

Description written by the publisher, not verified

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

Connect

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

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

Tools as reported by the server

• btc_price
  Get the current Bitcoin price in USD and other major currencies. Source: mempool.space. Real-time.
• btc_send_decision
  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
• lightning_address_resolve
  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.
• tx_decode_explain
  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
• optimal_send_window
  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
• json_validate
  Validate JSON, identify its root type, and return normalized JSON plus a SHA-256 content hash.
• json_extract
  Extract one value from JSON using a simple dot path with array indexes, for example users[0].email.
• csv_to_json
  Convert CSV, TSV, semicolon, or pipe-delimited text into structured JSON with bounded row output.
• text_analyze
  Return deterministic text statistics, estimated tokens, reading time, and a SHA-256 content hash.
• hash_generate
  Generate a SHA-256 or SHA-512 digest in hexadecimal or Base64 form.
• base64_convert
  Encode UTF-8 text to Base64 or decode Base64 safely, with standard and URL-safe alphabets.
• timestamp_convert
  Convert Unix seconds, Unix milliseconds, RFC3339, or ISO dates into normalized UTC timestamp forms.
• uuid_generate
  Generate one to one hundred cryptographically random RFC 4122 UUID version 4 identifiers.
• url_parse
  Parse an HTTP or HTTPS URL into normalized scheme, host, port, path, query, and fragment fields without fetching it.
• jwt_decode
  Decode JWT header and payload claims locally without verifying the signature. The response always marks verification as false.

Website · JSON · Text for agents · Registry updated 2026-10-08