// MCP TOOL REFERENCE

create_buy_transaction

Create a buy transaction (fiat -> crypto). The returned object contains status plus — depending on method — redirect URL for hosted checkout, Pix QR data, or card auth next steps.

ServerMcp Ap2
CategoryFinancial

How to control create_buy_transaction ↓

WHAT IT DOES

What create_buy_transaction does on Mcp Ap2

AI agents use create_buy_transaction to commit financial operations through Mcp Ap2 — usually the final step of a payment, billing, or trading workflow. A call moves real money.

THE RISK

Critical Risk

Why create_buy_transaction needs a policy

This tool initiates a financial transaction converting fiat currency to cryptocurrency, directly committing financial obligations and moving money. This is unambiguously a Financial category action with critical severity, as misuse could result in unauthorized purchases of cryptocurrency at potentially large amounts.

From the tool's definition Create a buy transaction (fiat -> crypto)

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

POLICY

How to control create_buy_transaction

PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Ap2, and nothing reaches the server without passing your rules. This is the rule we recommend for create_buy_transaction:

policy.json

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

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

Create a free account and register Mcp Ap2 — 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 Mcp Ap2 tools

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All 1300 Mcp Ap2 tools →

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Go deeper

Critical-risk tools in Mcp Ap2 → 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 create_buy_transaction

What does the create_buy_transaction tool do? +

Create a buy transaction (fiat -> crypto). The returned object contains status plus — depending on method — redirect URL for hosted checkout, Pix QR data, or card auth next steps. It is categorised as a Financial tool in the Mcp Ap2 MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on create_buy_transaction? +

Register the Mcp Ap2 MCP server in PolicyLayer and add a rule for create_buy_transaction: 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 Mcp Ap2. Nothing to install.

What risk level is create_buy_transaction? +

create_buy_transaction 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 create_buy_transaction? +

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

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

create_buy_transaction is provided by the Mcp Ap2 MCP server (@codespar/mcp-ap2). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Ap2 tool call.

Start from Mcp Ap2, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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1300 Mcp Ap2 tools catalogued and risk-classified — across an index of 43,000+ MCP servers.