listETFs
Returns ETF ticker symbols supported by the ETF API, paginated up to 1000 per call. Increment the offset parameter by 1000 until fewer than 1000 results are returned to walk the entire list. Available to Business, Professional, or annual subscribers only.
This record as markdown: /tools/com-api-ninjas-mcp/listetfs.md
What listETFs does on API Ninjas
AI agents call listETFs to retrieve information from API Ninjas without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
offset | integer | — | Number of results to skip for pagination. Page size is 1000. |
Parameters from the server's own tool schema.
Why listETFs is rated Low
Even though listETFs only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.
Risk signalsBulk/mass operation — affects multiple targets
Attacks that exploit this kind of access
The rule that runs listETFs safely
PolicyLayer is an MCP gateway: it sits between your AI agents and API Ninjas, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For listETFs, this is the rule to start with:
listETFs is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect API Ninjas, apply this rule, and every listETFs call is checked against it from then on.
Questions about listETFs
Returns ETF ticker symbols supported by the ETF API, paginated up to 1000 per call. Increment the offset parameter by 1000 until fewer than 1000 results are returned to walk the entire list. Available to Business, Professional, or annual subscribers only. It is categorised as a Read tool in the API Ninjas MCP Server, which means it retrieves data without modifying state.
listETFs accepts 1 parameter: offset. The full parameter table on this page comes from the server's own tool schema.
Register the API Ninjas MCP server in PolicyLayer and add a rule for listETFs: 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 API Ninjas. Nothing to install.
listETFs 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 listETFs 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 listETFs. 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.
listETFs is provided by the API Ninjas MCP server (https://mcp.api-ninjas.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
More on API Ninjas, and thousands of servers like it.
This server
Across the catalogue