AI agents call getTonBalance 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 performs a simple balance lookup on the TON blockchain, equivalent to a database query. It has no side effects, cannot modify data, and poses minimal risk even if misused by an agent—at worst, it exposes publicly available account balance information.
From the tool's definition Tool name 'getTonBalance' and description 'Get balance for a TON address' indicate a read-only query operation that retrieves account balance information without modifying state or executing transactions.
Documented attack patterns abuse exactly the kind of access getTonBalance 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 getTonBalance:
{
"version": "1",
"default": "deny",
"tools": {
"getTonBalance": {}
}
}getTonBalance 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 for a TON 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 getTonBalance: 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.
getTonBalance 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 getTonBalance 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 getTonBalance. 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.
getTonBalance 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.