Get user fills/trades within a specific time range from Hyperliquid exchange.
AI agents call get_user_fills_by_time to retrieve information from Hyperliquid without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves historical trade/fill data for a user within a specified time window. It queries existing data from the exchange without creating, modifying, deleting, or executing any operations. The blast radius is minimal—an AI agent can only read the user's own transaction history, which is non-sensitive for operation purposes (fills are already executed trades).
From the tool's definition Tool name 'get_user_fills_by_time' and description 'Get user fills/trades within a specific time range' indicate data retrieval with no modifications. The verb 'get' and lack of any write/delete/execute language confirm read-only operation.
Attacks that exploit this kind of access
Get user fills/trades within a specific time range from Hyperliquid exchange. It is categorised as a Read tool in the Hyperliquid MCP Server, which means it retrieves data without modifying state.
Register the Hyperliquid MCP server in PolicyLayer and add a rule for get_user_fills_by_time: 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 Hyperliquid. Nothing to install.
get_user_fills_by_time 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_user_fills_by_time 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_user_fills_by_time. 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_user_fills_by_time is provided by the Hyperliquid MCP server (midodimori/hyperliquid-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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