loop-mcp

com.loopxxi/loop-mcpVersion 2.4.0

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

Status

Responds323 msNov 14, 2026, 14:04 UTCAnswered our handshake without sign-in.

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Last checked: Nov 14, 2026, 14:04 UTC
Latency: 323 ms
Remotes responding: 1 of 1
Sign-in: No sign-in
Hosting: Hosted outside the EU (detected)
Registry data as of: Nov 14, 2026, 21:12 UTC

Data from the official MCP Registry, checked by run.zero. How we check

Connect

Streamable HTTP

https://mcp.loopxxi.com/mcpResponds323 msNov 14, 2026, 14:04 UTC

No sign-in

Claude Code

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

Claude Desktop and claude.ai

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Settings > Connectors > Add custom connector
Name: loop-mcp
Remote MCP server URL: https://mcp.loopxxi.com/mcp

Cursor

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

VS Code

code --add-mcp '{"name":"loop-mcp","type":"http","url":"https://mcp.loopxxi.com/mcp"}'

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Tools

16 tools

Tools of loop-mcp
	Description		Read-only	Idempotent	Open world
`base64_convert`Encode UTF-8 text to Base64 or decode Base64 safely, with standard and URL-safe alphabets.	Encode UTF-8 text to Base64 or decode Base64 safely, with standard and URL-safe alphabets.	No	Yes	Not declared	Yes
`btc_price`Get the current Bitcoin price in USD and other major currencies. Source: mempool.space. Real-time. Each reading carries source (the URL read), fetched_at (UTC, RFC 3339) and source_sha256 (SHA-256 of the upstream body as served).	Get the current Bitcoin price in USD and other major currencies. Source: mempool.space. Real-time. Each reading carries source (the URL read), fetched_at (UTC, RFC 3339) and source_sha256 (SHA-256 of the upstream body as served).	No	Yes	Not declared	Yes
`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 single decision call instead of parsing multiple raw mempool endpoints.	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 single decision call instead of parsing multiple raw mempool endpoints.	No	Yes	Not declared	Yes
`business_ratios`Compute cash runway in months, cash buffer days, current ratio, quick ratio, debt to equity, DSO, DIO, DPO and cash conversion cycle from any subset of a business's own cash, monthly flow and balance sheet figures. Arithmetic only, no network. Each value carries its formula and the inputs it used; a value that cannot be computed is null with a reason.	Compute cash runway in months, cash buffer days, current ratio, quick ratio, debt to equity, DSO, DIO, DPO and cash conversion cycle from any subset of a business's own cash, monthly flow and balance sheet figures. Arithmetic only, no network. Each value carries its formula and the inputs it used; a value that cannot be computed is null with a reason.	No	Yes	Not declared	Yes
`csv_to_json`Convert CSV, TSV, semicolon, or pipe-delimited text into structured JSON with bounded row output.	Convert CSV, TSV, semicolon, or pipe-delimited text into structured JSON with bounded row output.	No	Yes	Not declared	Yes
`hash_generate`Generate a SHA-256 or SHA-512 digest in hexadecimal or Base64 form.	Generate a SHA-256 or SHA-512 digest in hexadecimal or Base64 form.	No	Yes	Not declared	Yes
`json_extract`Extract one value from JSON using a simple dot path with array indexes, for example users[0].email.	Extract one value from JSON using a simple dot path with array indexes, for example users[0].email.	No	Yes	Not declared	Yes
`json_validate`Validate JSON, identify its root type, and return normalized JSON plus a SHA-256 content hash.	Validate JSON, identify its root type, and return normalized JSON plus a SHA-256 content hash.	No	Yes	Not declared	Yes
`jwt_decode`Decode JWT header and payload claims locally without verifying the signature. The response always marks verification as false.	Decode JWT header and payload claims locally without verifying the signature. The response always marks verification as false.	No	Yes	Not declared	Yes
`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.	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.	No	Yes	Not declared	Yes
`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 blocks, and an RBF-viability flag. A synthesis layer above raw fee data — the decision an autonomous payment agent needs before broadcasting. Source: mempool.space.	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 blocks, and an RBF-viability flag. A synthesis layer above raw fee data — the decision an autonomous payment agent needs before broadcasting. Source: mempool.space.	No	Yes	Not declared	Yes
`text_analyze`Return deterministic text statistics, estimated tokens, reading time, and a SHA-256 content hash.	Return deterministic text statistics, estimated tokens, reading time, and a SHA-256 content hash.	No	Yes	Not declared	Yes
`timestamp_convert`Convert Unix seconds, Unix milliseconds, RFC3339, or ISO dates into normalized UTC timestamp forms.	Convert Unix seconds, Unix milliseconds, RFC3339, or ISO dates into normalized UTC timestamp forms.	No	Yes	Not declared	Yes
`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 tokens vs parsing raw TX JSON.	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 tokens vs parsing raw TX JSON.	No	Yes	Not declared	Yes
`url_parse`Parse an HTTP or HTTPS URL into normalized scheme, host, port, path, query, and fragment fields without fetching it.	Parse an HTTP or HTTPS URL into normalized scheme, host, port, path, query, and fragment fields without fetching it.	No	Yes	Not declared	Yes
`uuid_generate`Generate one to one hundred cryptographically random RFC 4122 UUID version 4 identifiers.	Generate one to one hundred cryptographically random RFC 4122 UUID version 4 identifiers.	No	Yes	Not declared	Yes

Details

Registry status: Active
Published: Oct 8, 2026
Updated: Oct 8, 2026
Website: https://mcp.loopxxi.com/⁠ (opens in a new tab)
Repository: Not given
Categories (suggested): Finance and payments Developer toolsSuggested categories are assigned automatically from the registry text and may be wrong. Verified operators can correct them.
GDPR: Not declared

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