approve_token

A write tool on the Waiaas MCP server.

SERVERWaiaas SOURCEminhoyoo-iotrust/waiaas

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/minhoyoo-iotrust-waiaas/approve-token.md

WHAT IT DOES

What approve_token does on Waiaas

AI agents use approve_token to create or update resources in Waiaas, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Waiaas environment.

RISK

Why approve_token is rated Medium

Token approval (ERC-20 approve) is a write operation that modifies the blockchain state by increasing allowances, enabling subsequent transfers or DeFi operations by another party. While reversible (approval can be set to 0), misuse could lead to unauthorized fund access if an AI agent approves excessive amounts to a malicious contract.

From the tool's definition Tool name 'approve_token' on a crypto wallet MCP server; combined with sibling tools like 'aave_borrow', 'aave_supply', 'add_liquidity', 'bridge', and 'call_contract', this server performs financial operations.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs approve_token safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Waiaas, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For approve_token, this is the rule to start with:

approve_token Rate-limited

approve_token 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "approve_token": {
      "limits": [
        {
          "counter": "approve_token_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Waiaas, apply this rule, and every approve_token call is checked against it from then on.

FAQ

Questions about approve_token

What does the approve_token tool do? +

approve_token is a write tool on the Waiaas MCP server. It is categorised as a Write tool in the Waiaas MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on approve_token? +

Register the Waiaas MCP server in PolicyLayer and add a rule for approve_token: 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 Waiaas. Nothing to install.

What risk level is approve_token? +

approve_token is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit approve_token? +

Yes. Add a rate_limit block to the approve_token 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.

How do I block approve_token completely? +

Set action: deny in the PolicyLayer policy for approve_token. 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.

What MCP server provides approve_token? +

approve_token is provided by the Waiaas MCP server (minhoyoo-iotrust/waiaas). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on Waiaas, and thousands of servers like it.

This server

All 126 Waiaas tools →

Across the catalogue

The MCP Attack Database →

Guides

Govern customer-ops agents →Argument validation →Scoped token →