Aggregates and ranks live DeFi yield opportunities for any asset across lending supply (Aave, Morpho Blue, Spark), liquid staking (Lido, Rocket Pool, Coinbase), savings rates (Maker DSR/sDAI), curated vaults (MetaMorpho, Yearn), fixed-yield Pendle PTs, and basis capture (Ethena sUSDe) on EVM chai...
Part of the Syenite server.
Free to start. No card required.
AI agents invoke yield.opportunities to trigger processes or run actions in Syenite. Execute operations can have side effects beyond the immediate call -- triggering builds, sending notifications, or starting workflows. Rate limits and argument validation are essential to prevent runaway execution.
yield.opportunities can trigger processes with real-world consequences. An uncontrolled agent might start dozens of builds, send mass notifications, or kick off expensive compute jobs. PolicyLayer enforces rate limits and validates arguments to keep execution within safe bounds.
Execute tools trigger processes. Rate-limit and validate arguments to prevent unintended side effects.
{
"version": "1",
"default": "deny",
"tools": {
"yield.opportunities": {
"limits": [
{
"counter": "yield.opportunities_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}See the full Syenite policy for all 46 tools.
These attack patterns abuse exactly the kind of access yield.opportunities gives an agent. Each links to the full case and the policy that stops it:
Other execute tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Aggregates and ranks live DeFi yield opportunities for any asset across lending supply (Aave, Morpho Blue, Spark), liquid staking (Lido, Rocket Pool, Coinbase), savings rates (Maker DSR/sDAI), curated vaults (MetaMorpho, Yearn), fixed-yield Pendle PTs, and basis capture (Ethena sUSDe) on EVM chains, plus Kamino, MarginFi, Jito, Marinade, and Drift on Solana. Call this to discover where to deploy capital before deciding on a protocol; follow up with yield.assess to evaluate the risk of a specific opportunity. Pass asset (e.g. "USDC", "ETH", "stables") and chains (["ethereum"], ["solana"], or both) to scope results; optionally filter by riskTolerance ("low", "medium", "high") or tags (["fixed-yield"] for Pendle PTs, ["yt"] to surface Pendle YT markets which are hidden by default). Returns opportunities sorted by APY with risk level, TVL, lockup period, APY type (variable/fixed/estimated), and category counts; does not execute any transaction.. It is categorised as a Execute tool in the Syenite MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Syenite MCP server in PolicyLayer and add a rule for yield.opportunities: 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.
yield.opportunities is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the yield.opportunities 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 yield.opportunities. 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.
yield.opportunities 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.