Get ERC20 tokens balance of a wallet
AI agents call getERC20Balance to retrieve information from Somnia 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 blockchain data to retrieve the ERC20 token balance of a specified wallet address. It performs no state mutations, does not execute code or transactions, and does not move funds. It is purely informational and poses minimal risk even if invoked with arbitrary parameters.
From the tool's definition Tool name 'getERC20Balance' and description 'Get ERC20 tokens balance of a wallet' indicate a retrieval operation with no side effects. The 'get' prefix and 'balance' query operation confirm this is a read-only action.
Attacks that exploit this kind of access
Get ERC20 tokens balance of a wallet. It is categorised as a Read tool in the Somnia MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Somnia MCP Server MCP server in PolicyLayer and add a rule for getERC20Balance: 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 Somnia MCP Server. Nothing to install.
getERC20Balance 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 getERC20Balance 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 getERC20Balance. 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.
getERC20Balance is provided by the Somnia MCP Server MCP server (vastavikadi/somnia-mcp). 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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