amm-bid

THE RISK

Critical Risk

Why amm-bid needs a policy

Placing a bid on an AMM involves committing financial resources (XRP or tokens) to acquire auction slot rights on the AMM. This is a financial transaction on the XRP Ledger that moves or commits digital assets, making it a Financial category action. Misuse could result in unintended financial commitments or asset loss.

From the tool's definition Place a bid on an Automated Market Maker

Documented attack patterns abuse exactly the kind of access amm-bid gives an agent:

POLICY

How to control amm-bid

PolicyLayer is an MCP gateway — it sits between your AI agents and Xrpl mcp, and nothing reaches the server without passing your rules. This is the rule we recommend for amm-bid:

policy.json

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

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

Create a free account and register Xrpl mcp — 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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EXPLORE

Related tools and policies

More Xrpl mcp tools

Financial amm-deposit Deposit assets into an existing Automated Market Maker (AMM) on the XRP Ledger Financial transfer-token Transfer tokens between addresses Financial transfer-xrp Transfer XRP between accounts using the connected wallet or a named wallet Financial check-cash Cash a Check to receive funds from it Financial amm-clawback Clawback assets from an Automated Market Maker (AMM) Financial amm-create Create a new Automated Market Maker (AMM) on the XRP Ledger Financial approve-transaction Approve a pending transaction, signing and submitting it to the XRP Ledger. This is a dest Financial batch-payment Submit a batch of payment transactions. This is a convenience wrapper around batch-submit

All 71 Xrpl mcp tools →

Financial tools on other servers

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Go deeper

Critical-risk tools in Xrpl mcp → 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 amm-bid

What does the amm-bid tool do? +

Place a bid on an Automated Market Maker. It is categorised as a Financial tool in the Xrpl mcp MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on amm-bid? +

Register the Xrpl MCP server in PolicyLayer and add a rule for amm-bid: 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 Xrpl mcp. Nothing to install.

What risk level is amm-bid? +

amm-bid 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 amm-bid? +

Yes. Add a rate_limit block to the amm-bid 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 amm-bid completely? +

Set action: deny in the PolicyLayer policy for amm-bid. 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 amm-bid? +

amm-bid is provided by the Xrpl MCP server (romthpt/mcp-xrpl). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Xrpl mcp tool call.

Start from Xrpl mcp, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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