Returns real-time borrow APY, supply APY, available liquidity, utilization, max LTV, liquidation threshold, and liquidation penalty for every active lending market across Aave v3, Compound V3, Fluid, Morpho Blue, and Spark on Ethereum, Arbitrum, and Base, plus Kamino and MarginFi on Solana. Call ...
Part of the Syenite server.
Free to start. No card required.
AI agents call lending.rates.query to retrieve information from Syenite without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though lending.rates.query only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"lending.rates.query": {}
}
}See the full Syenite policy for all 46 tools.
These attack patterns abuse exactly the kind of access lending.rates.query gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Returns real-time borrow APY, supply APY, available liquidity, utilization, max LTV, liquidation threshold, and liquidation penalty for every active lending market across Aave v3, Compound V3, Fluid, Morpho Blue, and Spark on Ethereum, Arbitrum, and Base, plus Kamino and MarginFi on Solana. Call this before any borrow or supply decision to identify the cheapest borrow or the highest supply rate for a given asset pair; the response includes a bestBorrowRate summary field for quick comparison. Pass collateral (e.g. "WBTC", "ETH", "wstETH") and borrowAsset (e.g. "USDC", "DAI") to filter by pair; pass chain ("ethereum", "arbitrum", "base", "solana", or "all") to restrict scope — omitting either returns all markets. This tool is read-only and executes no transactions; APYs include compounding and are sourced live from on-chain data.. It is categorised as a Read tool in the Syenite MCP Server, which means it retrieves data without modifying state.
Register the Syenite MCP server in PolicyLayer and add a rule for lending.rates.query: 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 Syenite. Nothing to install.
lending.rates.query 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 lending.rates.query 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 lending.rates.query. 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.
lending.rates.query is provided by the Syenite MCP server (@syenite/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 46 Syenite tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.