# loop-mcp

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

- name: com.loopxxi/loop-mcp
- version: 2.4.0
- connection class: R0 (autonomous)
- trust: 81/100 flags: no-repository
- quality: 85/100 (good)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/com.loopxxi%2Floop-mcp
- tools: https://api.protogrid.dev/v1/servers/com.loopxxi%2Floop-mcp/tools

**An agent can connect right now, no human step.** Remote endpoint, no authentication, reachable on the last probe.

## Connection (mcpServers)

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


## Trust

- hygiene: 80
- liveness: 94
- freshness: 100
- provenance: 55
- drivers: +dns-namespace +website +reachable +uptime-86% +updated-12d-ago -no-repository
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 85/100 (good)

### protocol: 75 (weight 25)

- warn `protocol.modern`: newest supported version is 2024-11-05; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
- n/a `protocol.stateless`: only applies to 2026-07-28 servers
- pass `protocol.transport`: streamable HTTP
- n/a `protocol.list_ttl`: only applies to 2026-07-28 servers

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 86 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- pass `tools.annotations`: 15 of 15 tools declare readOnlyHint or destructiveHint
- fail `tools.directory_hints`: no tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: lightning_address_resolve (idempotentHint); btc_price (idempotentHint); btc_send_decision (idempotentHint); …
- pass `tools.token_cost`: about 1,813 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: 100 (weight 15)

- pass `stability.changes`: no tool changes in 30 days
- pass `stability.rug_pull`: no tool changed its meaning under the same name

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 15, about 1,813 tokens to load them all
- tool set hash: 7017215f07bbcf1840c61bf03124630d
- badge: [![protogrid quality](https://protogrid.dev/badge/com.loopxxi/loop-mcp.svg)](https://protogrid.dev/servers/com.loopxxi/loop-mcp)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

_No tool definition changes recorded._

## Remotes

- https://mcp.loopxxi.com/mcp (streamable-http, auth none, reachable true, uptime30d 0.86)

## Packages

_none_

## Tools (15)

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