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 invoke binance_us_create_listen_key to trigger actions in Sperax Ecosystem Crypto & DeFI MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
This tool initiates a real-time WebSocket data stream on a Binance US account, which is an external operation that establishes a persistent connection tied to the user's account. It doesn't directly move money or delete data, but it creates an account-level resource (listen key) that exposes real-time account data including balances, orders, and trades.
From the tool's definition Create a new listen key for User Data Stream WebSocket connection... Connect to: ${BINANCE_US_CONFIG.WS_URL}/ws/<listenKey>
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 Sperax Ecosystem Crypto & DeFI MCP Server, 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": 10,
"scope": "grant"
}
]
}
}
}binance_us_create_listen_key stays usable, but rate-capped — a runaway agent can't fire it dozens of times 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 Execute tool in the Sperax Ecosystem Crypto & DeFI MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Sperax Ecosystem Crypto & DeFI MCP Server 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 Sperax Ecosystem Crypto & DeFI MCP Server. Nothing to install.
binance_us_create_listen_key is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
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 Sperax Ecosystem Crypto & DeFI MCP Server MCP server (sperax/sperax-crypto-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Sperax Ecosystem Crypto & DeFI MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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1318 Sperax Ecosystem Crypto & DeFI MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.