Get earn/yield markets (single-asset deposits). Returns APY for deposit-only products like Spark stUSDS, Morpho Vaults.
AI agents call get_earn_markets to retrieve information from DeFi Rates 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 real-time DeFi yield data and APY information for deposit products. It performs a read-only query operation that retrieves market data for informational purposes.
From the tool's definition Tool name 'get_earn_markets' and description 'Returns APY for deposit-only products' indicate data retrieval with no modification capability. The tool queries and returns yield market information without creating, modifying, or executing any transactions.
Attacks that exploit this kind of access
Get earn/yield markets (single-asset deposits). Returns APY for deposit-only products like Spark stUSDS, Morpho Vaults. It is categorised as a Read tool in the DeFi Rates MCP Server MCP Server, which means it retrieves data without modifying state.
Register the DeFi Rates MCP Server MCP server in PolicyLayer and add a rule for get_earn_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 DeFi Rates MCP Server. Nothing to install.
get_earn_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_earn_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_earn_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_earn_markets is provided by the DeFi Rates MCP Server MCP server (qingfeng/defi-rates-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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