Undo a previous transfer from your custodial partner. ⚠️ REQUIRES CUSTODIAL SOLUTION API KEY ⚠️ Only certain transfers can be undone - check with your custodial partner. This reverses a previous custodian transfer by its transfer ID.
AI agents use binance_us_custodial_undo_transfer to commit financial operations through Sperax Ecosystem Crypto & DeFI MCP Server — usually the final step of a payment, billing, or trading workflow. A call moves real money.
This tool directly manipulates financial transfers and custodial accounts. While reversal/undo operations are theoretically reversible (unlike destructive deletes), the Financial category takes precedence because the tool explicitly moves money or reverses financial transactions via custodial partners. An AI agent with access could reverse legitimate transfers, redirect funds, or cause financial loss to users.
From the tool's definition Tool name includes 'undo_transfer' and description states it 'reverses a previous custodian transfer' involving financial assets in a crypto/DeFi ecosystem. The requirement for 'CUSTODIAL SOLUTION API KEY' indicates control over real financial accounts.
Documented attack patterns abuse exactly the kind of access binance_us_custodial_undo_transfer 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_custodial_undo_transfer:
{
"version": "1",
"default": "deny",
"tools": {
"binance_us_custodial_undo_transfer": {
"deny_if": [
{
"conditions": [],
"on_deny": "Requires human approval."
}
]
}
}
}Any call to binance_us_custodial_undo_transfer is blocked until a human approves it. The rest of the server keeps working.
Free to start. No card required.
Undo a previous transfer from your custodial partner. ⚠️ REQUIRES CUSTODIAL SOLUTION API KEY ⚠️ Only certain transfers can be undone - check with your custodial partner. This reverses a previous custodian transfer by its transfer ID. It is categorised as a Financial tool in the Sperax Ecosystem Crypto & DeFI MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Sperax Ecosystem Crypto & DeFI MCP Server MCP server in PolicyLayer and add a rule for binance_us_custodial_undo_transfer: 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_custodial_undo_transfer is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the binance_us_custodial_undo_transfer 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_custodial_undo_transfer. 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_custodial_undo_transfer 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.
Free to start. No card required.
1318 Sperax Ecosystem Crypto & DeFI MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.