Get the cheapest priced active, valid listings on a single collection.
AI agents call get_opensea_best_listings_by_collection to retrieve information from SEI MCP Server V2 without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a data retrieval operation that queries OpenSea listings by collection. It performs no write operations, does not execute code or commands, does not delete data, and does not involve financial transactions. The read-only nature and informational purpose (fetching price data) align with the 'Read' category. Severity is low as misuse would only expose publicly available market data.
From the tool's definition Tool name and description indicate 'Get the cheapest priced active, valid listings' — retrieves and queries NFT marketplace data with no side effects, mutations, or external operations triggered.
Attacks that exploit this kind of access
Get the cheapest priced active, valid listings on a single collection. It is categorised as a Read tool in the SEI MCP Server V2 MCP Server, which means it retrieves data without modifying state.
Register the SEI MCP Server V2 MCP server in PolicyLayer and add a rule for get_opensea_best_listings_by_collection: 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 SEI MCP Server V2. Nothing to install.
get_opensea_best_listings_by_collection 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_opensea_best_listings_by_collection 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_opensea_best_listings_by_collection. 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_opensea_best_listings_by_collection is provided by the SEI MCP Server V2 MCP server (testinguser1111111/sei-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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