Get available cryptocurrencies with optional amount filtering. USE WHEN: (1) User asks which cryptos available, (2) BEFORE onchain payment if crypto has multiple networks (e.g., USDC). DISPLAY RULES: Show users
AI agents call list_currencies_catalog 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 retrieves or queries a catalog of available cryptocurrencies with optional filtering. It has no side effects—it neither creates, modifies, deletes, executes code, nor handles financial transactions. The data returned simply informs users of available options. This is a classic Read operation.
From the tool's definition Tool name 'list_currencies_catalog' combined with description stating 'Get available cryptocurrencies' indicates a query operation.
Documented attack patterns abuse exactly the kind of access list_currencies_catalog 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 list_currencies_catalog:
{
"version": "1",
"default": "deny",
"tools": {
"list_currencies_catalog": {}
}
}list_currencies_catalog is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get available cryptocurrencies with optional amount filtering. USE WHEN: (1) User asks which cryptos available, (2) BEFORE onchain payment if crypto has multiple networks (e.g., USDC). DISPLAY RULES: Show users. 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 list_currencies_catalog: 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.
list_currencies_catalog 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 list_currencies_catalog 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 list_currencies_catalog. 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.
list_currencies_catalog 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.