revoke_token_approval

WHAT IT DOES

What revoke_token_approval does on Sperax Ecosystem Crypto & DeFI MCP Server

AI agents use revoke_token_approval to create or update resources in Sperax Ecosystem Crypto & DeFI MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Sperax Ecosystem Crypto & DeFI MCP Server environment.

THE RISK

Medium Risk

Why revoke_token_approval needs a policy

This tool modifies a token approval by setting it to zero, which is a write operation on blockchain state (changing allowance). While it reduces permissions (which could be considered protective), it is a state-modifying transaction that alters on-chain approval records. Misuse by an AI agent could revoke legitimate approvals, disrupting DeFi operations like staking or liquidity positions.

From the tool's definition Revoke (set to 0) a spender

Documented attack patterns abuse exactly the kind of access revoke_token_approval gives an agent:

POLICY

How to control revoke_token_approval

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 revoke_token_approval:

policy.json

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

revoke_token_approval 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.

Create a free account and register Sperax Ecosystem Crypto & DeFI MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Sperax Ecosystem Crypto & DeFI MCP Server tools

Financial api_ultrade_market_cancel_order Cancel open order Financial api_ultrade_market_cancel_orders Cancel multiple open orders Financial binance_us_cancel_oco Cancel an entire OCO order on Binance.US. Cancelling any individual leg will cancel the en Financial binance_us_cancel_order Cancel an active order on Binance.US. Either orderId or origClientOrderId must be provided Financial binance_us_cancel_replace Cancel an existing order and place a new order on the same symbol atomically. This is usef Financial binance_us_cust_cancel_orders_symbol Cancel all active custodial orders for a specific trading pair. ⚠️ REQUIRES CUSTODIAL SOL Financial BinanceCrossMarginCancelAllOrders Cancel all open orders on a symbol in Cross Margin account. Financial BinanceDeliveryCancelBatchOrders Cancel multiple COIN-M Futures orders in batch (max 10).

All 1318 Sperax Ecosystem Crypto & DeFI MCP Server tools →

Write tools on other servers

M-Team MCP Server download_torrent YouTube MCP Server generate_video_title Android Forensics ADB MCP Server combine_reports 0xarchive web3_signup

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about revoke_token_approval

What does the revoke_token_approval tool do? +

Revoke (set to 0) a spender. It is categorised as a Write tool in the Sperax Ecosystem Crypto & DeFI MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on revoke_token_approval? +

Register the Sperax Ecosystem Crypto & DeFI MCP Server MCP server in PolicyLayer and add a rule for revoke_token_approval: 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.

What risk level is revoke_token_approval? +

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

Can I rate-limit revoke_token_approval? +

Yes. Add a rate_limit block to the revoke_token_approval 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 revoke_token_approval completely? +

Set action: deny in the PolicyLayer policy for revoke_token_approval. 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 revoke_token_approval? +

revoke_token_approval 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.

Enforce policy on every Sperax Ecosystem Crypto & DeFI MCP Server tool call.

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.

CHECK YOUR STACK →

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.