Get assets with the highest recent price change percentage.
Part of the True Markets Market Data server.
Free to start. No card required.
AI agents call get_surging_assets to retrieve information from True Markets Market Data 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_surging_assets 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_surging_assets": {}
}
}See the full True Markets Market Data policy for all 10 tools.
These attack patterns abuse exactly the kind of access get_surging_assets 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.
Get assets with the highest recent price change percentage.. It is categorised as a Read tool in the True Markets Market Data MCP Server, which means it retrieves data without modifying state.
Register the True Markets Market Data MCP server in PolicyLayer and add a rule for get_surging_assets: 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 True Markets Market Data. Nothing to install.
get_surging_assets 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_surging_assets 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_surging_assets. 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_surging_assets is provided by the True Markets Market Data MCP server (https://mcp.truemarkets.co/marketdata/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 10 True Markets Market Data 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.