OpenBook (Aliserag/OpenBook) is an MCP server listed on the M8ven Trust Index. It scores 64 out of 100, grade C. It declares 7 tools. No publisher has claimed this listing.

Back to MCP Trust IndexM8ven
C
Caution
64/100

OpenBook

OpenBook — chargebacks for the machine economy. ETHOnline 2026: Arc + The Graph + ENS.

→ Aliserag/OpenBook· listed on github_repo_search

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.

How we verified

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Who stands behind it

Aliserag

Source: github_repo_search

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GitHub

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: 3 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 exposes7 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.

list_datasets

List the datasets this server sells: the configured subgraphs plus the ENS svc.menu catalog. Returns id, schema, price, freshness and description per dataset.

get_quote

Resolve the live price/SLA/payee for a dataset from the ENSv2 svc.* records (Sepolia). Hard-fails (ENS_RESOLUTION_FAILED) when records are missing — never quotes hard-coded values.

discover_datasets

Find subgraphs to sell: searches The Graph's catalog through the official Subgraph MCP (same Gateway key) and returns candidates with a ready-to-paste dataset config entry, marking the ones this server already sells.

choose_seller

Decide which seller to buy a dataset from. Enumerates the sellers that list it on ENSv2, reads each one's live price and freshness window, measures the dataset's index lag right now (Gateway _meta vs chain head), drops sellers whose window the index cannot meet, and picks the cheapest (prefer=cheap)…

query_dataset

Query a dataset through The Graph Gateway with the _meta freshness gate. When chainHeadBlock - _meta.block > maxAge the result is marked unavailable (STALE) and is NEVER charged. Fresh results carry a signed attestation (queryId|payloadHash|metaBlock).

verify_delivery

Deterministically verify a delivered query against its SLA: metaBlock >= minBlock (resolved from the onchain job description unless overridden) and a well-formed payloadHash -> APPROVE; otherwise REJECT (STALE_DATA/INVALID_HASH). Purely computes the verdict by default; pass settle:true to ALSO execu…

get_pnl

Query the open-book subgraph on arc-testnet (Studio): dailyPnLs { id revenue costs refunds net } plus the indexing _meta block.

// known CVEs in dependencies3 high

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

high@modelcontextprotocol/sdk@1.19.0GHSA-345p-7cg4-v4c7

@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse

high@modelcontextprotocol/sdk@1.19.0GHSA-8r9q-7v3j-jr4g

Anthropic's MCP TypeScript SDK has a ReDoS vulnerability

high@modelcontextprotocol/sdk@1.19.0GHSA-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.
configSEPOLIA_RPCany Sepolia RPC (default: public Sepolia)
// 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

7/7 tools missing one or more hints — list_datasets (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); get_quote (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); discover_datasets (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +4 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.

Production dependencies are patched

0 critical, 3 high severity in production deps — @modelcontextprotocol/sdk@1.19.0 (high), @modelcontextprotocol/sdk@1.19.0 (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 3 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
[![M8ven Verified](https://m8ven.ai/badge/mcp/aliserag/openbook?variant=verified)](https://m8ven.ai/mcp/aliserag/openbook)
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commit: e5c95e5bb572fc087264e9fe9cc8706cd38c8cd3
code hash: 40e1460984475ccbc608f9415420ca7a2f9a2302ac64eb7a8b2adf88b25d1b34
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