ref_finance_get_swap_estimate
AI agents call ref_finance_get_swap_estimate to retrieve information from NEAR MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool appears to retrieve swap price estimates from a DeFi protocol (ref_finance likely refers to Ref Finance on NEAR). Getting estimates is a read-only operation with no side effects—it does not execute swaps, transfer funds, or modify state. Despite the empty description reducing confidence slightly, the function name strongly suggests a query operation typical of DeFi price feeds.
From the tool's definition Tool name 'get_swap_estimate' indicates a retrieval/query operation. The empty description limits certainty, but the naming convention suggests it queries estimated swap prices rather than executing a transaction.
Documented attack patterns abuse exactly the kind of access ref_finance_get_swap_estimate gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and NEAR MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for ref_finance_get_swap_estimate:
{
"version": "1",
"default": "deny",
"tools": {
"ref_finance_get_swap_estimate": {}
}
}ref_finance_get_swap_estimate is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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ref_finance_get_swap_estimate. It is categorised as a Read tool in the NEAR MCP MCP Server, which means it retrieves data without modifying state.
Register the NEAR MCP server in PolicyLayer and add a rule for ref_finance_get_swap_estimate: 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 NEAR MCP. Nothing to install.
ref_finance_get_swap_estimate 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 ref_finance_get_swap_estimate 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 ref_finance_get_swap_estimate. 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.
ref_finance_get_swap_estimate is provided by the NEAR MCP server (nearai/near-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from NEAR MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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23 NEAR MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.