crypto_history

ServerVNStock Agent MCP Server
CategoryRead

WHAT IT DOES

What crypto_history does on VNStock Agent MCP Server

AI agents call crypto_history to retrieve information from VNStock Agent MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why crypto_history needs a policy

This tool retrieves historical price data for cryptocurrencies. It is a read-only query with no side effects, no data modification, and no financial transactions. It simply fetches market data based on symbol, date range, and interval parameters.

From the tool's definition Get cryptocurrency historical price data

Documented attack patterns abuse exactly the kind of access crypto_history gives an agent:

POLICY

How to control crypto_history

PolicyLayer is an MCP gateway — it sits between your AI agents and VNStock Agent MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for crypto_history:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "crypto_history": {}
  }
}

crypto_history is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register VNStock Agent MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More VNStock Agent MCP Server tools

Read fx_history Get forex (currency pair) historical price data. Args: symbol: Currency pair Read stock_history Get historical OHLCV price data for a Vietnamese stock. Args: symbol: Stock t Read world_index_history Get world market index historical data. Args: symbol: Index symbol (e.g. DJI Read company_events Get company events (dividends, AGM, earnings, etc). Args: symbol: Stock ticke Read company_news Get latest news about a company. Args: symbol: Stock ticker symbol (e.g. VNM, Read company_officers Get company officers / management team. Args: symbol: Stock ticker symbol (e. Read company_overview Get company overview information (industry, market cap, description, etc). Args: Read company_shareholders Get major shareholders of a company. Args: symbol: Stock ticker symbol (e.g.

All 21 VNStock Agent MCP Server tools →

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
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MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about crypto_history

What does the crypto_history tool do? +

Get cryptocurrency historical price data. Args: symbol: Crypto symbol (e.g. BTC, ETH, SOL) start: Start date YYYY-MM-DD (default: 30 days ago) end: End date YYYY-MM-DD (default: today) interval: Time interval - 1D, 1W, 1M (default: 1D). It is categorised as a Read tool in the VNStock Agent MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on crypto_history? +

Register the VNStock Agent MCP Server MCP server in PolicyLayer and add a rule for crypto_history: 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 VNStock Agent MCP Server. Nothing to install.

What risk level is crypto_history? +

crypto_history is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit crypto_history? +

Yes. Add a rate_limit block to the crypto_history 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.

How do I block crypto_history completely? +

Set action: deny in the PolicyLayer policy for crypto_history. 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.

What MCP server provides crypto_history? +

crypto_history is provided by the VNStock Agent MCP Server MCP server (mrgoonie/vnstock-agent). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every VNStock Agent MCP Server tool call.

Start from VNStock Agent MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →

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21 VNStock Agent MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.