Create a new listen key for User Data Stream WebSocket connection. The listen key is used to subscribe to real-time account updates via WebSocket. Connect to: ${BINANCE_US_CONFIG.WS_URL}/ws/<listenKey> ⚠️ IMPORTANT: - Listen keys are valid for 60 minutes - Use binance_us_keepalive_listen_key ever...
AI agents use binance_us_create_listen_key to create or update resources in BNB Chain MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your BNB Chain MCP environment.
An AI agent can call binance_us_create_listen_key faster than any human can review — one bad instruction and it creates or modifies resources in BNB Chain MCP by the hundred, each call as confident as the last.
Risk signalsBulk/mass operation — affects multiple targets
Documented attack patterns abuse exactly the kind of access binance_us_create_listen_key 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 binance_us_create_listen_key:
{
"version": "1",
"default": "deny",
"tools": {
"binance_us_create_listen_key": {
"limits": [
{
"counter": "binance_us_create_listen_key_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}binance_us_create_listen_key stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Create a new listen key for User Data Stream WebSocket connection. The listen key is used to subscribe to real-time account updates via WebSocket. Connect to: ${BINANCE_US_CONFIG.WS_URL}/ws/<listenKey> ⚠️ IMPORTANT: - Listen keys are valid for 60 minutes - Use binance_us_keepalive_listen_key every 30 minutes to extend validity - A stream will close when the listen key expires - You can only have ONE active listen key per account The stream sends updates for: - outboundAccountPosition: Account balance updates - balanceUpdate: Deposit/withdrawal updates - executionReport: Order/trade updates This endpoint requires API key but does NOT require signature. It is categorised as a Write tool in the BNB Chain MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the BNB Chain MCP server in PolicyLayer and add a rule for binance_us_create_listen_key: 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.
binance_us_create_listen_key is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the binance_us_create_listen_key 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 binance_us_create_listen_key. 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.
binance_us_create_listen_key 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.