Fetches an optimal swap or bridge quote across 30+ EVM chains and Solana using the LI.FI aggregator (EVM) or Jupiter (Solana), comparing routes from DEXs and bridges including 1inch, 0x, Paraswap, and major cross-chain bridges to find the best price with lowest fees. Call this before any token ex...
Part of the Syenite server.
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AI agents invoke swap.quote 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.
swap.quote 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": {
"swap.quote": {
"limits": [
{
"counter": "swap.quote_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 swap.quote 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.
Fetches an optimal swap or bridge quote across 30+ EVM chains and Solana using the LI.FI aggregator (EVM) or Jupiter (Solana), comparing routes from DEXs and bridges including 1inch, 0x, Paraswap, and major cross-chain bridges to find the best price with lowest fees. Call this before any token exchange to obtain a quote; then pass the returned unsigned transaction calldata to a wallet for signing and submission — Syenite never holds or touches private keys. Provide fromToken, toToken, fromAmount (human-readable), fromAddress, and fromChain; set toChain for cross-chain bridges, or omit to default to the same chain. Returns best route, expected output, minimum output (with slippage), gas cost, fee breakdown, and estimated execution time; cross-chain bridges may take 2–30 minutes and should be tracked with swap.status. Quotes are valid for approximately 30 seconds — re-query for fresh pricing. Does not execute the swap.. 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 swap.quote: 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.
swap.quote 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 swap.quote 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 swap.quote. 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.
swap.quote 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.