wallet_getBalance

THE RISK

Low Risk

Why wallet_getBalance needs a policy

This tool performs a read-only operation—querying the balance of a wallet on the BSV blockchain. It retrieves data without side effects, does not execute transactions, does not create or modify data, and does not delete anything. The operation is informational only. Severity is low because misuse would only expose wallet balance information, not enable unauthorized fund transfers or destructive actions.

From the tool's definition Tool name 'wallet_getBalance' and description 'Retrieves the current BSV balance for the wallet' indicate a query operation that reads blockchain state without modification or execution of transactions.

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

POLICY

How to control wallet_getBalance

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_getBalance:

policy.json

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

wallet_getBalance is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

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.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Bitcoin SV MCP Server tools

Financial bsocial_createPost Create a social post on the BSV blockchain using B:// and MAP protocols. Posts are stored Financial wallet_cancelListing Cancel an ordinal marketplace listing Financial wallet_transferOrdToken Transfer an ordinal inscription or send BSV21 fungible tokens. Use type= Financial wallet_acquireCertificate Acquires an identity certificate from a certifier. Financial wallet_listOrdinal List an ordinal for sale on the marketplace Financial wallet_mintCollection Mint a collection of ordinals from a folder of images with proper metadata. This tool crea Financial wallet_opnsDeregister Deregister an OpNS name Financial wallet_purchaseListing Purchases a listing from the Bitcoin SV ordinals marketplace. Supports both NFT purchases

All 80 Bitcoin SV MCP Server tools →

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Go deeper

Roll out MCP under one policy → Per-person scoped tokens, one central policy, and full audit across every server your team connects.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about wallet_getBalance

What does the wallet_getBalance tool do? +

Retrieves the current BSV balance for the wallet. It is categorised as a Read tool in the Bitcoin SV MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on wallet_getBalance? +

Register the Bitcoin SV MCP Server MCP server in PolicyLayer and add a rule for wallet_getBalance: 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_getBalance? +

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

Can I rate-limit wallet_getBalance? +

Yes. Add a rate_limit block to the wallet_getBalance 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_getBalance completely? +

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

wallet_getBalance 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.

CHECK YOUR STACK →