Get cryptocurrency-related markets. Optionally filter by specific crypto symbol.
AI agents call get_crypto_markets to retrieve information from Polymarket 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 or queries market data without creating, modifying, deleting, or executing any operations. It returns information about cryptocurrency markets, which is a non-destructive data retrieval operation. The low severity reflects that misuse would only result in an agent viewing market information, not taking financial positions or modifying data.
From the tool's definition Tool description states 'Get cryptocurrency-related markets' with optional filtering by crypto symbol. The verb 'get' and the absence of any modification, creation, deletion, or execution language indicate a read-only operation.
Attacks that exploit this kind of access
Get cryptocurrency-related markets. Optionally filter by specific crypto symbol. It is categorised as a Read tool in the Polymarket MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Polymarket MCP Server MCP server in PolicyLayer and add a rule for get_crypto_markets: 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 Polymarket MCP Server. Nothing to install.
get_crypto_markets 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 get_crypto_markets 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 get_crypto_markets. 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.
get_crypto_markets is provided by the Polymarket MCP Server MCP server (nancheng582-jpg/polymarket-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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