Get native token balance for an address on any supported chain.
AI agents call balance to retrieve information from Mcp Services without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves blockchain balance information without modifying state, executing code, or causing any irreversible changes. It is a simple query operation that returns account data. The severity is low because misuse would only expose publicly readable blockchain data that is not sensitive or exploitable.
From the tool's definition Tool name is 'balance' and description states 'Get native token balance for an address on any supported chain.' The verb 'Get' and the read-only nature of querying balance information indicate no data modification or side effects.
Attacks that exploit this kind of access
Get native token balance for an address on any supported chain. It is categorised as a Read tool in the Mcp Services MCP Server, which means it retrieves data without modifying state.
Register the Mcp Services MCP server in PolicyLayer and add a rule for balance: 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 Mcp Services. Nothing to install.
balance 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 balance 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 balance. 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.
balance is provided by the Mcp Services MCP server (san-npm/mcp-services). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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