stx_preview_transfer

Preview an STX transfer with fee estimation and balance check.

SERVERBitcoin wallet MCP server SOURCEmarkmhendrickson/mcp-server-bitcoin

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/markmhendrickson-mcp-server-bitcoin/stx-preview-transfer.md

WHAT IT DOES

What stx_preview_transfer does on Bitcoin wallet MCP server

AI agents call stx_preview_transfer to retrieve information from Bitcoin wallet MCP server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why stx_preview_transfer is rated Low

The tool only previews a transfer — it performs fee estimation and balance checking without actually executing or committing any transaction. No funds are moved, and there are no side effects. This is a read/query operation that simulates what a transfer would look like.

From the tool's definition Preview an STX transfer with fee estimation and balance check

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs stx_preview_transfer safely

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

stx_preview_transfer Allowed

stx_preview_transfer is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "stx_preview_transfer": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Bitcoin wallet MCP server, apply this rule, and every stx_preview_transfer call is checked against it from then on.

FAQ

Questions about stx_preview_transfer

What does the stx_preview_transfer tool do? +

Preview an STX transfer with fee estimation and balance check. It is categorised as a Read tool in the Bitcoin wallet MCP server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on stx_preview_transfer? +

Register the Bitcoin wallet MCP server MCP server in PolicyLayer and add a rule for stx_preview_transfer: 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 wallet MCP server. Nothing to install.

What risk level is stx_preview_transfer? +

stx_preview_transfer is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit stx_preview_transfer? +

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

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

stx_preview_transfer is provided by the Bitcoin wallet MCP server MCP server (markmhendrickson/mcp-server-bitcoin). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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