Get list of supported vs currencies (fiat and crypto)
AI agents call market_coingecko_supported_currencies to retrieve information from BNB Chain MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool merely returns a list of supported currencies from CoinGecko's API. It performs a read-only lookup of static reference data, has no side effects, cannot modify or delete data, and does not involve financial transactions or code execution. The minimal blast radius from misuse (an AI agent requesting this data) poses negligible risk.
From the tool's definition Tool description states 'Get list of supported vs currencies (fiat and crypto)' - a straightforward query operation that retrieves reference data without modification, execution, or financial impact.
Documented attack patterns abuse exactly the kind of access market_coingecko_supported_currencies gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and BNB Chain MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for market_coingecko_supported_currencies:
{
"version": "1",
"default": "deny",
"tools": {
"market_coingecko_supported_currencies": {}
}
}market_coingecko_supported_currencies is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get list of supported vs currencies (fiat and crypto). It is categorised as a Read tool in the BNB Chain MCP MCP Server, which means it retrieves data without modifying state.
Register the BNB Chain MCP server in PolicyLayer and add a rule for market_coingecko_supported_currencies: 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 BNB Chain MCP. Nothing to install.
market_coingecko_supported_currencies 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_coingecko_supported_currencies 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_coingecko_supported_currencies. 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_coingecko_supported_currencies is provided by the BNB Chain MCP server (nirholas/bnbchain-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 1240 BNB Chain MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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1240 BNB Chain MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.