Lists every blockchain currency PayRam supports on this node (chain code, network, currency code).
AI agents call list_currencies to retrieve information from PayRam MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a straightforward informational query that retrieves and enumerates supported currencies without modifying any state, executing code, moving funds, or causing destructive actions. The blast radius of misuse is minimal—an attacker gains only knowledge of supported cryptocurrencies, which is typically public information. Classification as Read is appropriate.
From the tool's definition Tool name 'list_currencies' and description 'Lists every blockchain currency PayRam supports on this node (chain code, network, currency code)' indicate a data retrieval operation with no side effects.
Risk signalsBulk/mass operation — affects multiple targets
Documented attack patterns abuse exactly the kind of access list_currencies gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and PayRam MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_currencies:
{
"version": "1",
"default": "deny",
"tools": {
"list_currencies": {}
}
}list_currencies is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Lists every blockchain currency PayRam supports on this node (chain code, network, currency code). It is categorised as a Read tool in the PayRam MCP Server MCP Server, which means it retrieves data without modifying state.
Register the PayRam MCP Server MCP server in PolicyLayer and add a rule for list_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 PayRam MCP Server. Nothing to install.
list_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 list_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 list_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.
list_currencies is provided by the PayRam MCP Server MCP server (payram/payram-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 35 PayRam MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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35 PayRam MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.