Find the best fixed-rate yield opportunities across all Spectra chains. Scans all supported networks and returns the top opportunities ranked by implied APY. Filters by asset type if specified. Important: This ranks by raw implied APY without considering your capital size or pool liquidity. These...
Part of the Spectra server.
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AI agents call get_best_fixed_yields to retrieve information from Spectra 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 get_best_fixed_yields 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": {
"get_best_fixed_yields": {}
}
}See the full Spectra policy for all 25 tools.
These attack patterns abuse exactly the kind of access get_best_fixed_yields 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.
Find the best fixed-rate yield opportunities across all Spectra chains. Scans all supported networks and returns the top opportunities ranked by implied APY. Filters by asset type if specified. Important: This ranks by raw implied APY without considering your capital size or pool liquidity. These rankings will often disagree with scan_opportunities (which ranks by effective APY after entry cost). That disagreement is intentional -- raw APY reflects the pool's headline rate while effective APY reflects what you actually capture at your capital size. Neither ranking is "correct" -- they measure different things. Use both to develop conviction about which pools genuinely serve your strategy.. It is categorised as a Read tool in the Spectra MCP Server, which means it retrieves data without modifying state.
Register the Spectra MCP server in PolicyLayer and add a rule for get_best_fixed_yields: 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 Spectra. Nothing to install.
get_best_fixed_yields 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_best_fixed_yields 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_best_fixed_yields. 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_best_fixed_yields is provided by the Spectra MCP server (spectra-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 25 Spectra tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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