// 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 Afip
CategoryFinancial

How to control create_buy_transaction ↓

WHAT IT DOES

What create_buy_transaction does on Mcp Afip

AI agents use create_buy_transaction to commit financial operations through Mcp Afip — 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 real financial transaction converting fiat currency to cryptocurrency, involving payment processing (card, Pix, hosted checkout). Misuse could result in unauthorized financial commitments or fraudulent purchases, making it critical severity under the Financial category.

From the tool's definition Create a buy transaction (fiat -> crypto)... redirect URL for hosted checkout, Pix QR data, or card auth next steps

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 Afip, 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 Afip — 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 Afip tools

Financial authorize_transaction Authorize a transaction (reserve funds without capturing) via Braintree GraphQL authorizeP Financial cancel_collection Cancel a scheduled collection request Financial cancel_credit Cancel an authorized-but-uncaptured credit payment. Financial cancel_payment Attempt to cancel a payment that has not yet settled. Iniciador endpoint: POST /payments/{ Financial cancel_payment_intent Cancel a payment intent that has not yet been captured. Fails on already-captured intents; Financial cancel_recurrence Cancel an active recurrence. Future charges will stop; already-charged cycles are untouche Financial cancel_subscription Cancel a subscription by ID Financial revoke_token Revoke an issued access_token or refresh_token at POST /v1/token/revoke. Use to terminate

All 1300 Mcp Afip tools →

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Go deeper

Critical-risk tools in Mcp Afip → 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 Afip 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 Afip 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 Afip. 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 Afip MCP server (codespar/mcp-dev-latam). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Afip tool call.

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