PutV1InstancesReceiversVirtualAccountsById

THE RISK

Medium Risk

Why PutV1InstancesReceiversVirtualAccountsById needs a policy

This tool modifies virtual account data reversibly through an update operation. While it doesn't move money directly (which would be Financial), it reconfigures payment infrastructure objects that control financial operations.

From the tool's definition Tool name 'PutV1InstancesReceiversVirtualAccountsById' uses HTTP PUT (update operation) on virtual accounts within a payment infrastructure context. Description states 'Update Virtual Account'.

Documented attack patterns abuse exactly the kind of access PutV1InstancesReceiversVirtualAccountsById gives an agent:

POLICY

How to control PutV1InstancesReceiversVirtualAccountsById

PolicyLayer is an MCP gateway — it sits between your AI agents and BlindPay MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for PutV1InstancesReceiversVirtualAccountsById:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "PutV1InstancesReceiversVirtualAccountsById": {
      "limits": [
        {
          "counter": "putv1instancesreceiversvirtualaccountsbyid_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

PutV1InstancesReceiversVirtualAccountsById stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register BlindPay 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.

LIMIT THIS TOOL →

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EXPLORE

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Go deeper

Govern customer-ops agents → PII redaction, approval on external messages, and no-bulk-delete rules on the records agents change.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
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 PutV1InstancesReceiversVirtualAccountsById

What does the PutV1InstancesReceiversVirtualAccountsById tool do? +

Update Virtual Account. It is categorised as a Write tool in the BlindPay MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on PutV1InstancesReceiversVirtualAccountsById? +

Register the BlindPay MCP Server MCP server in PolicyLayer and add a rule for PutV1InstancesReceiversVirtualAccountsById: 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 BlindPay MCP Server. Nothing to install.

What risk level is PutV1InstancesReceiversVirtualAccountsById? +

PutV1InstancesReceiversVirtualAccountsById is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit PutV1InstancesReceiversVirtualAccountsById? +

Yes. Add a rate_limit block to the PutV1InstancesReceiversVirtualAccountsById 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 PutV1InstancesReceiversVirtualAccountsById completely? +

Set action: deny in the PolicyLayer policy for PutV1InstancesReceiversVirtualAccountsById. 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 PutV1InstancesReceiversVirtualAccountsById? +

PutV1InstancesReceiversVirtualAccountsById is provided by the BlindPay MCP Server MCP server (blindpaylabs/blindpay-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every BlindPay MCP Server tool call.

Start from BlindPay 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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