AI agents call erc1155_balanceOfBatch to retrieve information from MCP Ethers Wallet without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
ERC-1155 balanceOfBatch is a standard Ethereum token standard method that queries token balances for multiple accounts and token IDs without modifying state. Despite the empty description, the tool name and context from sibling read-only balance query tools provide strong evidence this is a read operation with no side effects.
From the tool's definition Tool name 'erc1155_balanceOfBatch' follows the pattern of sibling tools erc1155_balanceOf, erc20_balanceOf, and erc721_balanceOf, which are clearly read-only balance query methods. The 'balanceOf' naming convention indicates data retrieval.
Documented attack patterns abuse exactly the kind of access erc1155_balanceOfBatch gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Ethers Wallet, and nothing reaches the server without passing your rules. This is the rule we recommend for erc1155_balanceOfBatch:
{
"version": "1",
"default": "deny",
"tools": {
"erc1155_balanceOfBatch": {}
}
}erc1155_balanceOfBatch is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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erc1155_balanceOfBatch. It is categorised as a Read tool in the MCP Ethers Wallet MCP Server, which means it retrieves data without modifying state.
Register the MCP Ethers Wallet MCP server in PolicyLayer and add a rule for erc1155_balanceOfBatch: 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 Ethers Wallet. Nothing to install.
erc1155_balanceOfBatch 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 erc1155_balanceOfBatch 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 erc1155_balanceOfBatch. 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.
erc1155_balanceOfBatch is provided by the MCP Ethers Wallet MCP server (crazyrabbitltc/mcp-ethers-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from MCP Ethers Wallet, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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69 MCP Ethers Wallet tools catalogued and risk-classified — across an index of 43,000+ MCP servers.