query_blockchain_sql

THE RISK

High Risk

Based on the tool name and server context, this tool likely executes SQL queries against blockchain data. SQL execution can range from read-only SELECT queries to destructive DDL/DML operations. Sibling tools like 'query_sql' and 'query_dataset' suggest arbitrary query execution. Empty description lowers confidence, but the Execute category is most appropriate given the SQL execution pattern.

From the tool's definition Tool name 'query_blockchain_sql' and server context (sibling tool 'query_sql', SQL-based blockchain data extraction). Description is empty/uninformative.

Documented attack patterns abuse exactly the kind of access query_blockchain_sql gives an agent:

HOW TO CONTROL QUERY_BLOCKCHAIN_SQL

PolicyLayer is an MCP gateway — it sits between your AI agents and Cryo MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for query_blockchain_sql:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "query_blockchain_sql": {
      "limits": [
        {
          "counter": "query_blockchain_sql_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

query_blockchain_sql stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register Cryo MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

More Cryo MCP Server tools

Read get_latest_ethereum_block Get information about the latest Ethereum block Returns: Information abou Read get_sql_examples get_sql_examples Read get_sql_table_schema get_sql_table_schema Read get_transaction_by_hash Get detailed information about a transaction by its hash Args: tx_hash: T Read list_available_sql_tables List all available parquet files that can be queried with SQL USAGE NOTES: - Read list_datasets Return a list of all available cryo datasets Read lookup_dataset Look up a specific dataset and return detailed information about it. IMPORTANT: Always use Read query_dataset query_dataset

All 10 Cryo MCP Server tools →

Execute tools on other servers

Frida Game Hacking MCP remove_breakpoint Procmon request_elevation WireMCP capture_packets Pentest Ai run_probe

Go deeper

High-risk tools in Cryo MCP Server → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

What does the query_blockchain_sql tool do? +

query_blockchain_sql. It is categorised as a Execute tool in the Cryo MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on query_blockchain_sql? +

Register the Cryo MCP Server MCP server in PolicyLayer and add a rule for query_blockchain_sql: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Cryo MCP Server. Nothing to install.

What risk level is query_blockchain_sql? +

query_blockchain_sql is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit query_blockchain_sql? +

Yes. Add a rate_limit block to the query_blockchain_sql rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block query_blockchain_sql completely? +

Set action: deny in the PolicyLayer policy for query_blockchain_sql. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides query_blockchain_sql? +

query_blockchain_sql is provided by the Cryo MCP Server MCP server (z80dev/cryo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Cryo MCP Server tool call.

Deterministic rules across all 10 Cryo MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

GOVERN CRYO →

Free to start. No card required.

10 Cryo MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.

// WHAT QUERY_BLOCKCHAIN_SQL ON CRYO MCP SERVER DOES

// THE RISK

// HOW TO CONTROL QUERY_BLOCKCHAIN_SQL

// EXPLORE