AI agents call market_chart to retrieve information from Crypto Multi-MCP Hub without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Despite the empty description, the name 'market_chart' most naturally indicates a data retrieval function (querying historical price/volume data for charting purposes). This is consistent with sibling Read tools like 'coin_info', 'clob_markets', and 'amm_price'. The absence of a description slightly lowers confidence, but the naming convention and context strongly suggest it retrieves rather than modifies data.
From the tool's definition Tool name 'market_chart' suggests retrieval of historical market data visualization or charting data; no description provided to indicate write, execute, or destructive operations.
Documented attack patterns abuse exactly the kind of access market_chart gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Crypto Multi-MCP Hub, and nothing reaches the server without passing your rules. This is the rule we recommend for market_chart:
{
"version": "1",
"default": "deny",
"tools": {
"market_chart": {}
}
}market_chart is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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market_chart. It is categorised as a Read tool in the Crypto Multi-MCP Hub MCP Server, which means it retrieves data without modifying state.
Register the Crypto Multi-MCP Hub MCP server in PolicyLayer and add a rule for market_chart: 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 Crypto Multi-MCP Hub. Nothing to install.
market_chart is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the market_chart 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.
Set action: deny in the PolicyLayer policy for market_chart. 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.
market_chart is provided by the Crypto Multi-MCP Hub MCP server (pellenybe/crypto-mcp-server---by-corax-colab). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Crypto Multi-MCP Hub, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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48 Crypto Multi-MCP Hub tools catalogued and risk-classified — across an index of 43,000+ MCP servers.