This API call returns an array of cryptocurrencies available at Twelve Data API. This list is updated daily.
AI agents call GetCryptocurrencies to retrieve information from Twelve Data MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves cryptocurrency metadata from the Twelve Data API. It has no side effects, creates no data, executes no operations, and cannot be used to modify or delete anything. It is a simple list/fetch operation, making it a Read category risk with low severity since cryptocurrency listings are public information and misuse presents minimal risk.
From the tool's definition Tool description states it 'returns an array of cryptocurrencies available' — a query operation with no modification, deletion, or execution of code. The verb 'returns' indicates data retrieval only.
Documented attack patterns abuse exactly the kind of access GetCryptocurrencies gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Twelve Data MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for GetCryptocurrencies:
{
"version": "1",
"default": "deny",
"tools": {
"GetCryptocurrencies": {}
}
}GetCryptocurrencies is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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This API call returns an array of cryptocurrencies available at Twelve Data API. This list is updated daily. It is categorised as a Read tool in the Twelve Data MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Twelve Data MCP Server MCP server in PolicyLayer and add a rule for GetCryptocurrencies: 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 Twelve Data MCP Server. Nothing to install.
GetCryptocurrencies 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 GetCryptocurrencies 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 GetCryptocurrencies. 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.
GetCryptocurrencies is provided by the Twelve Data MCP Server MCP server (twelvedata/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 186 Twelve Data MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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186 Twelve Data MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.