Fetch the list of coin markets sorted by market cap.
AI agents call get_coins_markets 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.
This tool queries and returns market data without creating, modifying, deleting, or executing any operations. It has no ability to alter state, move funds, or trigger autonomous actions. The blast radius of misuse is minimal—an agent could retrieve market data unnecessarily but cannot cause harm beyond wasted API calls or information leakage.
From the tool's definition Tool name 'get_coins_markets' and description 'Fetch the list of coin markets sorted by market cap' indicate a retrieval operation with no side effects. The verb 'Fetch' is explicitly a read-only action.
Documented attack patterns abuse exactly the kind of access get_coins_markets 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 get_coins_markets:
{
"version": "1",
"default": "deny",
"tools": {
"get_coins_markets": {}
}
}get_coins_markets is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Fetch the list of coin markets sorted by market cap. 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 get_coins_markets: 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.
get_coins_markets 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 get_coins_markets 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 get_coins_markets. 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.
get_coins_markets 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.
Free to start. No card required.
48 Crypto Multi-MCP Hub tools catalogued and risk-classified — across an index of 43,000+ MCP servers.