Returns historical OHLCV market values for one or more cryptocurrencies.
AI agents call cryptoOhlcvHistorical to retrieve information from CoinMarketCap MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves cryptocurrency market historical data without creating, modifying, deleting, or executing any operations. It is a pure data retrieval function analogous to a historical price lookup. While the data could inform financial decisions, the tool itself performs no financial transactions, no code execution, and no irreversible actions.
From the tool's definition Tool name and description: 'Returns historical OHLCV market values' — retrieves historical price data (Open, High, Low, Close, Volume) with no modification or side effects.
Documented attack patterns abuse exactly the kind of access cryptoOhlcvHistorical gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and CoinMarketCap MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for cryptoOhlcvHistorical:
{
"version": "1",
"default": "deny",
"tools": {
"cryptoOhlcvHistorical": {}
}
}cryptoOhlcvHistorical is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Returns historical OHLCV market values for one or more cryptocurrencies. It is categorised as a Read tool in the CoinMarketCap MCP MCP Server, which means it retrieves data without modifying state.
Register the CoinMarketCap MCP server in PolicyLayer and add a rule for cryptoOhlcvHistorical: 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 CoinMarketCap MCP. Nothing to install.
cryptoOhlcvHistorical 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 cryptoOhlcvHistorical 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 cryptoOhlcvHistorical. 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.
cryptoOhlcvHistorical is provided by the CoinMarketCap MCP server (shinzo-labs/coinmarketcap-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 51 CoinMarketCap MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
51 CoinMarketCap MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.