wallet_cancelListing

THE RISK

Critical Risk

Why wallet_cancelListing needs a policy

Cancelling a marketplace listing is a financial/blockchain operation that modifies an active market listing for an ordinal (NFT) on the BSV blockchain. This involves broadcasting a transaction to the blockchain, which is irreversible once confirmed and directly affects financial/marketplace commitments.

From the tool's definition Cancel an ordinal marketplace listing

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

POLICY

How to control wallet_cancelListing

PolicyLayer is an MCP gateway — it sits between your AI agents and Bitcoin SV MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for wallet_cancelListing:

policy.json

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

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

Create a free account and register Bitcoin SV 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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EXPLORE

Related tools and policies

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Go deeper

Govern MCP payment tools → Approval gates, spend caps, and per-identity scopes on every refund, payout, and charge your agents make.
Critical-risk tools in Bitcoin SV 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 →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about wallet_cancelListing

What does the wallet_cancelListing tool do? +

Cancel an ordinal marketplace listing. It is categorised as a Financial tool in the Bitcoin SV MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on wallet_cancelListing? +

Register the Bitcoin SV MCP Server MCP server in PolicyLayer and add a rule for wallet_cancelListing: 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 Bitcoin SV MCP Server. Nothing to install.

What risk level is wallet_cancelListing? +

wallet_cancelListing 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 wallet_cancelListing? +

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

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

wallet_cancelListing is provided by the Bitcoin SV MCP Server MCP server (b-open-io/bsv-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Bitcoin SV MCP Server tool call.

Start from Bitcoin SV MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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