buy-token

THE RISK

Critical Risk

Why buy-token needs a policy

Buying tokens on Pump.fun involves spending cryptocurrency (SOL) to acquire tokens, which is a direct financial transaction. Given the context of an AI agent autonomously executing trades on a live blockchain, misuse could result in irreversible financial loss. The server description explicitly states it enables AI to 'buy and sell tokens,' confirming real monetary transactions.

From the tool's definition "Buy a Pump.fun token" — purchasing a token on a trading platform constitutes a financial transaction committing real funds (SOL/cryptocurrency).

Documented attack patterns abuse exactly the kind of access buy-token gives an agent:

POLICY

How to control buy-token

PolicyLayer is an MCP gateway — it sits between your AI agents and Pump Fun MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for buy-token:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "buy-token": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

Any call to buy-token is blocked until a human approves it. The rest of the server keeps working.

Create a free account and register Pump Fun 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.

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Free to start. No card required.

EXPLORE

Related tools and policies

More Pump Fun MCP Server tools

Financial sell-token Sell a Pump.fun token Financial create-token Create a new Pump.fun token Read get-account-balance Get the SOL and token balances for an account Read get-token-info Get information about a Pump.fun token Read list-accounts List all accounts in the keys folder

All 6 Pump Fun MCP Server tools →

Financial tools on other servers

0xarchive web3_subscribe Math MCP Server financial_calculator MCP Kling generate_video MCP Uber Server uber_request_ride

Go deeper

Critical-risk tools in Pump Fun MCP Server → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Human-in-the-loop → When a tool call should wait for a person — and when policy can decide alone.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →

FAQ

Questions about buy-token

What does the buy-token tool do? +

Buy a Pump.fun token. It is categorised as a Financial tool in the Pump Fun MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on buy-token? +

Register the Pump Fun MCP Server MCP server in PolicyLayer and add a rule for buy-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 Pump Fun MCP Server. Nothing to install.

What risk level is buy-token? +

buy-token is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit buy-token? +

Yes. Add a rate_limit block to the buy-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 buy-token completely? +

Set action: deny in the PolicyLayer policy for buy-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 buy-token? +

buy-token is provided by the Pump Fun MCP Server MCP server (noahgsolomon/pumpfun-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Pump Fun MCP Server tool call.

Start from Pump Fun 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 →