Get balance and token holdings for a Cardano address
AI agents call getCardanoAddressBalance to retrieve information from Web3 MCP Server 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 balance information from a Cardano address. It performs no mutations, financial transactions, code execution, or destructive operations. It is purely informational, similar to other read-only blockchain inspection tools like 'getBalance' and 'getAccountInfo' visible in the sibling tools list.
From the tool's definition Tool name 'getCardanoAddressBalance' and description 'Get balance and token holdings for a Cardano address' indicate a read-only query operation that retrieves blockchain data without modifying state.
Documented attack patterns abuse exactly the kind of access getCardanoAddressBalance gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Web3 MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for getCardanoAddressBalance:
{
"version": "1",
"default": "deny",
"tools": {
"getCardanoAddressBalance": {}
}
}getCardanoAddressBalance 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.
Get balance and token holdings for a Cardano address. It is categorised as a Read tool in the Web3 MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Web3 MCP Server MCP server in PolicyLayer and add a rule for getCardanoAddressBalance: 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 Web3 MCP Server. Nothing to install.
getCardanoAddressBalance 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 getCardanoAddressBalance 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 getCardanoAddressBalance. 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.
getCardanoAddressBalance is provided by the Web3 MCP Server MCP server (strangelove-ventures/web3-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 55 Web3 MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
55 Web3 MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.