Withdraw tokens from ZetaChain and call a contract on connected chain
Part of the Universal Blockchain server.
Free to start. No card required.
AI agents use withdraw_and_call to initiate financial transactions through Universal Blockchain. Financial operations involve real money and are irreversible once processed. PolicyLayer blocks financial tools by default, requiring explicit human approval with transaction-level limits to prevent unauthorised spending.
withdraw_and_call moves real money. Without a policy, an autonomous agent could initiate transactions that drain accounts or exceed budgets. PolicyLayer blocks financial tools by default, requiring human-in-the-loop approval with configurable spending limits per transaction and per time window.
Financial tools involve real money. Block by default and require explicit human approval before enabling.
{
"version": "1",
"default": "deny",
"tools": {
"withdraw_and_call": {
"deny_if": [
{
"conditions": [],
"on_deny": "Requires human approval."
}
]
}
}
}See the full Universal Blockchain policy for all 56 tools.
These attack patterns abuse exactly the kind of access withdraw_and_call gives an agent. Each links to the full case and the policy that stops it:
Other financial tools across the catalogue. The same approach applies to each: deny by default, or require human approval.
Withdraw tokens from ZetaChain and call a contract on connected chain. It is categorised as a Financial tool in the Universal Blockchain MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Universal Blockchain MCP server in PolicyLayer and add a rule for withdraw_and_call: 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 Universal Blockchain. Nothing to install.
withdraw_and_call 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 withdraw_and_call 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 withdraw_and_call. 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.
withdraw_and_call is provided by the Universal Blockchain MCP server (universal-blockchain-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 56 Universal Blockchain tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.