Mempool.space (alexandresanlim/mempool-mcp-server) is an MCP server listed on the M8ven Trust Index. It scores 70 out of 100, grade C. It declares 31 tools. No publisher has claimed this listing.

Back to MCP Trust IndexM8ven
C
Caution
70/100

Mempool.space

Integrates with mempool.space APIs to provide real-time Bitcoin network data including transaction details, block information, address balances, mining statistics, and fee recommendations for developers and traders.

→ alexandresanlim/mempool-mcp-server· npm: @sanlim/mempool-mcp-server· 371 installs· listed on pulsemcp

Caution. Specific findings reduced this grade. They are listed on the page. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.

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Who stands behind it

alexandresanlim

Source: PulseMCP

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Install from

PulseMCPnot scored here

The grade above is for the source repository. Registries can serve a different version, so we mark the ones we were not able to read.

// key findings
⚠️
Known vulnerabilities in dependencies: 2 high
Affects packages this MCP installs at runtime. Upgrade or remove the affected dependency.
✅
No credential exfiltration, no sensitive file access, no obfuscation
Static analysis found nothing flowing your secrets to unexpected places.
✅
Open source with a license and README
Anyone can audit the code, the license is declared, and the publisher documents what it does.
// tools this server exposes31 tools

These names and descriptions are the publisher's own, read from the source code. We print them as written. Our assessment is the findings above, not this list.

get-address-info

Returns details about an address

get-address-txs

Returns transactions for an address

get-address-txs-chain

Returns chain transactions for an address

get-address-txs-mempool

Returns mempool transactions for an address

get-address-utxo

Returns UTXOs for an address

get-block

Returns details about a block from hash

get-blocks

Returns the latest blocks

get-block-txids

Returns txids for a block

get-block-txs

Returns transactions for a block

get-block-status

Returns status for a block

get-block-raw

Returns raw hex for a block

get-block-txid-by-index

Returns txid for a block at a specific index

get-block-header

Returns the block header in hex

get-recommended-fees

Get recommended fees for Bitcoin

get-difficulty-adjustment

Returns current and next Bitcoin difficulty adjustment info

get-price

Returns the current BTC price in various fiat currencies

get-historical-price

Returns the BTC price for a specific date (YYYY-MM-DD)

get-base-url

Returns mempool.space base url api

get-mempool-info

Returns mempool info

get-mempool-txids

Returns mempool txids

get-mempool-recent

Returns recent mempool transactions

get-mining-pools

Returns mining pools info

get-mining-pool

Returns info for a specific mining pool

get-mining-blocks-fees-24h

Returns mining blocks fees for the last 24h

get-stats-info

Returns stats info

get-tx-info

Returns details about a transaction

get-tx-status

Returns status for a transaction

get-tx-raw

Returns raw hex for a transaction

get-tx-merkleblock-proof

Returns the merkleblock proof for a transaction

get-tx-outspend

Returns outspend info for a transaction output

get-tx-outspends

Returns outspends info for all outputs of a transaction

// known CVEs in dependencies2 high

Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.

high@modelcontextprotocol/sdk@1.9.0GHSA-8r9q-7v3j-jr4g

Anthropic's MCP TypeScript SDK has a ReDoS vulnerability

high@modelcontextprotocol/sdk@1.9.0GHSA-w48q-cv73-mx4w

Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default

Depend on this server? Get alerted when its CVEs change.Watch this server free →
// environment variables
To run this server yourself, you supply these values. They go in your own MCP client configuration and stay on your machine. The secret label means the value is sensitive, not that the server mishandles it.
configMEMPOOL_BASE_URL"": "http://umbrel.local:3006/api"
// quality suggestions

Tool annotations

No tools have read-only/destructive annotations

Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.

All four hints declared on every tool

31/31 tools missing one or more hints — get-address-info (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); get-address-txs (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); get-address-txs-chain (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +28 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.

For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.

Tool inputs are validated

20/31 tool handlers declare input schemas (65%)

Declare an inputSchema with zod/joi/yup on every tool definition.

Tool handlers catch errors

Only 0/31 tool handlers wrap calls in try/catch (0%)

Wrap each tool handler body in try/catch and return a structured error response.

Tests exist

No test files found

Add tests that exercise each declared tool.

Production dependencies are patched

0 critical, 2 high severity in production deps — @modelcontextprotocol/sdk@1.9.0 (high), @modelcontextprotocol/sdk@1.9.0 (high)

Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.

Claim the listing to review these findings one by one and send us a correction where you disagree, straight to the team. Claiming also means we tell you when the grade moves, and reach you first if we find anything urgent.

// full audit trail
The findings above are the summary. The full trail, every check we ran, each deduction, the network hosts observed and the dependency advisories, goes to verified publishers, along with an alert whenever a new one lands. Verified publishers can also review each finding and dispute it in one click. Publisher corrections have sharpened several of our checks this month, because the maintainer knows the codebase better than any scanner.
// improvement guidance — verified publishers only
We have 6 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.
// embed badge in your README
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commit: 328821c1d6a32dcefa590c3d278304c39c10f8e0
code hash: 480a59b9195f3b26dedc6521371ff2735589d8b8e006bc7e12f3f470dd4e16ad
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