Check token allowances for multiple token/spender pairs
AI agents call batch_check_allowances to retrieve information from BNB Chain MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only operation to query the current state of token allowances on the blockchain. It retrieves information about how much of a token a user has authorized a spender to use, but does not approve new allowances, transfer tokens, or execute any state-changing operations.
From the tool's definition Tool name 'batch_check_allowances' and description 'Check token allowances for multiple token/spender pairs' indicate a query operation that retrieves and reads existing allowance data without modifying state.
Risk signalsBulk/mass operation — affects multiple targets
Documented attack patterns abuse exactly the kind of access batch_check_allowances gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and BNB Chain MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for batch_check_allowances:
{
"version": "1",
"default": "deny",
"tools": {
"batch_check_allowances": {}
}
}batch_check_allowances is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Check token allowances for multiple token/spender pairs. It is categorised as a Read tool in the BNB Chain MCP MCP Server, which means it retrieves data without modifying state.
Register the BNB Chain MCP server in PolicyLayer and add a rule for batch_check_allowances: 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 BNB Chain MCP. Nothing to install.
batch_check_allowances 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 batch_check_allowances 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 batch_check_allowances. 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.
batch_check_allowances is provided by the BNB Chain MCP server (nirholas/bnbchain-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 1240 BNB Chain MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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1240 BNB Chain MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.