15 pay-per-call Bitcoin and developer tools, paid in sats over Lightning (L402).
Connect Remote server
claude mcp add --transport http loop-mcp https://mcp.loopxxi.com/mcp
{
"mcpServers": {
"loop-mcp": {
"url": "https://mcp.loopxxi.com/mcp"
}
}
}
{
"servers": {
"loop-mcp": {
"type": "http",
"url": "https://mcp.loopxxi.com/mcp"
}
}
}
Settings > Connectors > Add custom connector
URL: https://mcp.loopxxi.com/mcp
Tools 16 found in our last check
btc_priceGet 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).
btc_send_decisionReturns 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 fo…
lightning_address_resolveResolve a Lightning Address ([email protected]) 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_explainFetch 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…
optimal_send_windowBitcoin 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…
json_validateValidate JSON, identify its root type, and return normalized JSON plus a SHA-256 content hash.
json_extractExtract one value from JSON using a simple dot path with array indexes, for example users[0].email.
csv_to_jsonConvert CSV, TSV, semicolon, or pipe-delimited text into structured JSON with bounded row output.
text_analyzeReturn deterministic text statistics, estimated tokens, reading time, and a SHA-256 content hash.
hash_generateGenerate a SHA-256 or SHA-512 digest in hexadecimal or Base64 form.
base64_convertEncode UTF-8 text to Base64 or decode Base64 safely, with standard and URL-safe alphabets.
timestamp_convertConvert Unix seconds, Unix milliseconds, RFC3339, or ISO dates into normalized UTC timestamp forms.
uuid_generateGenerate one to one hundred cryptographically random RFC 4122 UUID version 4 identifiers.
url_parseParse an HTTP or HTTPS URL into normalized scheme, host, port, path, query, and fragment fields without fetching it.
jwt_decodeDecode JWT header and payload claims locally without verifying the signature. The response always marks verification as false.
business_ratiosCompute 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…
Details
| Endpoint | https://mcp.loopxxi.com/mcp (Streamable HTTP) |
| First published | 8 Oct 2026 |
| Last updated | 8 Oct 2026 |
| Registry name | com.loopxxi/loop-mcp |
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