Get ERC-20 token balance for an address on any supported EVM network
AI agents call getEvmTokenBalance 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 only queries and retrieves balance information from the blockchain. It performs a read-only operation that does not create, modify, delete, execute code, or involve financial transactions. The word 'Get' and the passive nature of balance queries confirm this is a Read category tool with minimal risk.
From the tool's definition Tool name 'getEvmTokenBalance' and description 'Get ERC-20 token balance for an address on any supported EVM network' indicate a data retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access getEvmTokenBalance 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 getEvmTokenBalance:
{
"version": "1",
"default": "deny",
"tools": {
"getEvmTokenBalance": {}
}
}getEvmTokenBalance 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 ERC-20 token balance for an address on any supported EVM network. 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 getEvmTokenBalance: 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.
getEvmTokenBalance 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 getEvmTokenBalance 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 getEvmTokenBalance. 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.
getEvmTokenBalance 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.