# Mempool Space (npm · @pipeworx/mcp-mempool-space)

mempool.space MCP — Bitcoin block explorer + mempool/fee stats

- Trust score: 83/100 (high trust)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `gateway.pipeworx.io`: 63/100, [markdown](https://verifymcp.io/servers/pipeworx-io-mempool-space/mempool-space-mcp.md), [page](https://verifymcp.io/servers/pipeworx-io-mempool-space/mempool-space-mcp)
- npm · `@pipeworx/mcp-mempool-space`: 83/100 (this document), [markdown](https://verifymcp.io/servers/pipeworx-io-mempool-space/pipeworx-mcp-mempool-space.md), [page](https://verifymcp.io/servers/pipeworx-io-mempool-space/pipeworx-mcp-mempool-space)

## Channel facts

- Registry: `npm`
- Package: `@pipeworx/mcp-mempool-space`
- Version: `0.2.1`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-05.

- **Supply Chain Security**: 100/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - No production dependencies, so there is no dependency health to assess.
- **Provenance & Transparency**: 97/100
  - Source repository is publicly reachable at the declared URL.
  - Cryptographically verified build provenance (signed, bound to pipeworx-io/mcp-mempool-space).
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 2 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 72/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 968 tokens (~96/item across 10 items; 10 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 23/100
  - Stability observed for 7 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 93/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 78% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 10 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 11 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Mempool Space MCP server?

Mempool Space runs locally as an npm package, launched with npx -y @pipeworx/mcp-mempool-space. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add pipeworx-io-mempool-space -- npx -y @pipeworx/mcp-mempool-space
```

### Cursor

```json
{
  "mcpServers": {
    "pipeworx-io-mempool-space": {
      "command": "npx",
      "args": [
        "-y",
        "@pipeworx/mcp-mempool-space"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "pipeworx-io-mempool-space": {
      "command": "npx",
      "args": [
        "-y",
        "@pipeworx/mcp-mempool-space"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add pipeworx-io-mempool-space -- npx -y @pipeworx/mcp-mempool-space
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "pipeworx-io-mempool-space": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "@pipeworx/mcp-mempool-space"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add pipeworx-io-mempool-space --command npx --arg -y --arg @pipeworx/mcp-mempool-space
```

### Hermes

```yaml
mcp_servers:
  pipeworx-io-mempool-space:
    command: "npx"
    args: ["-y", "@pipeworx/mcp-mempool-space"]
```

### Netclaw

```json
{
  "McpServers": {
    "pipeworx-io-mempool-space": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "@pipeworx/mcp-mempool-space"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add pipeworx-io-mempool-space -t stdio -c npx -a -y @pipeworx/mcp-mempool-space
```

### Other

```json
{
  "mcpServers": {
    "pipeworx-io-mempool-space": {
      "command": "npx",
      "args": [
        "-y",
        "@pipeworx/mcp-mempool-space"
      ]
    }
  }
}
```

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-04 (score 83, +16)

- [security improvement] Malware scan: unverified → pass
- [functional regression] Security disclosure: unverified → fail

### 2026-11-03 (score 67, −13)

- [security regression] Malware scan: pass → unverified
- [functional regression] Security disclosure: fail → unverified
- [functional improvement] Stability: unverified → 0.17
- [functional] Package version: 0.2.0 → 0.2.1

### 2026-10-30 (score 80, 0)

- [functional regression] Security disclosure: unverified → fail

### 2026-10-29 (score 80)

First indexed and scored.

## MCP tools (10)

### `recommended_fees` (~63 tokens)

Current sat/vB fee recommendations.

Input parameters:

- `network` (string): Which Bitcoin network. Defaults to mainnet — the real Bitcoin network, which is what "Bitcoin" means in an ordinary question. "bitcoin" and "btc" are accepted as aliases for mainnet.

### `mempool_stats` (~67 tokens)

Current mempool size + tx count + total fees.

Input parameters:

- `network` (string): Which Bitcoin network. Defaults to mainnet — the real Bitcoin network, which is what "Bitcoin" means in an ordinary question. "bitcoin" and "btc" are accepted as aliases for mainnet.

### `block_height` (~81 tokens)

Return the current chain tip block height (latest mined block number) for mainnet, testnet, signet, or liquid.

Input parameters:

- `network` (string): Which Bitcoin network. Defaults to mainnet — the real Bitcoin network, which is what "Bitcoin" means in an ordinary question. "bitcoin" and "btc" are accepted as aliases for mainnet.

### `get_block` (~76 tokens)

Block detail by hash or height.

Input parameters:

- `hash_or_height` (string, required): Block hash or numeric height
- `network` (string): Which Bitcoin network. Defaults to mainnet — the real Bitcoin network, which is what "Bitcoin" means in an ordinary question. "bitcoin" and "btc" are accepted as aliases for mainnet.

### `get_transaction` (~94 tokens)

Fetch full transaction detail (inputs, outputs, fee, size, confirmation status) for a given txid on mainnet/testnet/signet/liquid.

Input parameters:

- `network` (string): Which Bitcoin network. Defaults to mainnet — the real Bitcoin network, which is what "Bitcoin" means in an ordinary question. "bitcoin" and "btc" are accepted as aliases for mainnet.
- `txid` (string, required)

### `get_tx_status` (~87 tokens)

Return confirmation status (confirmed, block hash, block height) for a txid without fetching the full transaction body.

Input parameters:

- `network` (string): Which Bitcoin network. Defaults to mainnet — the real Bitcoin network, which is what "Bitcoin" means in an ordinary question. "bitcoin" and "btc" are accepted as aliases for mainnet.
- `txid` (string, required)

### `get_address` (~71 tokens)

Address summary (UTXO + tx counts).

Input parameters:

- `address` (string, required)
- `network` (string): Which Bitcoin network. Defaults to mainnet — the real Bitcoin network, which is what "Bitcoin" means in an ordinary question. "bitcoin" and "btc" are accepted as aliases for mainnet.

### `get_address_transactions` (~150 tokens)

Recent Bitcoin transactions touching one address, read from the mempool.space block explorer API (mainnet by default; testnet, signet, and Liquid also selectable). Returns up to 50 transactions with txid, inputs, outputs, values in satoshis, fee, size, and confirmation status. Answers what a BTC address has been sending or receiving lately.

Input parameters:

- `address` (string, required)
- `limit` (number): Default 25 (max ~50)
- `network` (string): Which Bitcoin network. Defaults to mainnet — the real Bitcoin network, which is what "Bitcoin" means in an ordinary question. "bitcoin" and "btc" are accepted as aliases for mainnet.

### `hashrate` (~113 tokens)

Network hashrate + difficulty history.

Input parameters:

- `network` (string): Which Bitcoin network. Defaults to mainnet — the real Bitcoin network, which is what "Bitcoin" means in an ordinary question. "bitcoin" and "btc" are accepted as aliases for mainnet.
- `period` (string): 1d | 3d | 1w | 1m | 3m | 6m | 1y | 2y | 3y | all (default 3m)

### `mining_pools` (~111 tokens)

Block share by mining pool.

Input parameters:

- `network` (string): Which Bitcoin network. Defaults to mainnet — the real Bitcoin network, which is what "Bitcoin" means in an ordinary question. "bitcoin" and "btc" are accepted as aliases for mainnet.
- `period` (string): 24h | 3d | 1w | 1m | 3m | 6m | 1y | 2y | 3y | all (default 1w)

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/pipeworx-io-mempool-space/pipeworx-mcp-mempool-space#diagnostics

## Score history

- 2026-11-05: 83
- 2026-11-04: 83
- 2026-11-03: 67
- 2026-11-02: 80
- 2026-11-01: 80
- 2026-10-31: 80
- 2026-10-30: 80
- 2026-10-29: 80

## Common questions

### What is the Mempool Space MCP server?

Mempool Space is an MCP server listed in the public MCP registry as io.github.pipeworx-io/mempool-space. mempool.space MCP, Bitcoin block explorer + mempool/fee stats. This page covers its npm package (@pipeworx/mcp-mempool-space).

### Is the Mempool Space MCP server safe to use?

Mempool Space scores 83 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 5 November 2026. It declares no install or post-install scripts. Its build provenance is signed and verified. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Mempool Space MCP server expose?

Mempool Space exposes 10 tools: recommended_fees, mempool_stats, block_height, get_block, get_transaction, and 5 more. Their descriptions and schemas cost roughly 913 tokens of context every time the server is loaded.

### Is the Mempool Space MCP server still maintained?

Mempool Space is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What licence is the Mempool Space MCP server under?

Mempool Space declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

## Links

- npm package: https://www.npmjs.com/package/@pipeworx/mcp-mempool-space
- Socket report: https://socket.dev/npm/package/@pipeworx/mcp-mempool-space
- Repository: https://github.com/pipeworx-io/mcp-mempool-space
- Website: https://pipeworx.io/packs/mempool-space
- Changelog RSS feed: https://verifymcp.io/servers/pipeworx-io-mempool-space/pipeworx-mcp-mempool-space.xml
- Changelog JSON feed: https://verifymcp.io/servers/pipeworx-io-mempool-space/pipeworx-mcp-mempool-space.json
- HTML version of this page: https://verifymcp.io/servers/pipeworx-io-mempool-space/pipeworx-mcp-mempool-space