Returns the biggest gainers and losers in a given time period.
AI agents call cryptoTrendingGainersLosers to retrieve information from CoinMarketCap MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries cryptocurrency market data (gainers/losers rankings) without creating, modifying, deleting, or executing any operations. It has no ability to affect external systems, move funds, or trigger actions. The output is informational market data only, making it a Read category tool with low severity and broad blast radius limitations.
From the tool's definition Tool name 'cryptoTrendingGainersLosers' and description 'Returns the biggest gainers and losers in a given time period' indicate data retrieval with no side effects. This is a query operation that fetches market trend data.
Documented attack patterns abuse exactly the kind of access cryptoTrendingGainersLosers gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and CoinMarketCap MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for cryptoTrendingGainersLosers:
{
"version": "1",
"default": "deny",
"tools": {
"cryptoTrendingGainersLosers": {}
}
}cryptoTrendingGainersLosers is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Returns the biggest gainers and losers in a given time period. It is categorised as a Read tool in the CoinMarketCap MCP MCP Server, which means it retrieves data without modifying state.
Register the CoinMarketCap MCP server in PolicyLayer and add a rule for cryptoTrendingGainersLosers: 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 CoinMarketCap MCP. Nothing to install.
cryptoTrendingGainersLosers 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 cryptoTrendingGainersLosers 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 cryptoTrendingGainersLosers. 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.
cryptoTrendingGainersLosers is provided by the CoinMarketCap MCP server (shinzo-labs/coinmarketcap-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 51 CoinMarketCap MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
51 CoinMarketCap MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.