buy_topup

Purchase a top-up data package for an existing eSIM. Returns a Stripe checkout URL.

SERVERGitsim Chat SOURCEhttps://chat.gitsim.com/api/mcp

Critical RISK CLASS

Category Financial

Parameters 33 required

Recommended Approval-gatedsee the rule below

Registry record Grade C, identity unverified Pull the record →

This record as markdown: /tools/com-gitsim-chat/buy-topup.md

WHAT IT DOES

What buy_topup does on Gitsim Chat

AI agents use buy_topup to commit financial operations through Gitsim Chat, usually the final step of a payment, billing, or trading workflow. A call moves real money.

Parameter	Type	Required	Description
`iccid`	string	Yes	The ICCID of the eSIM to top up
`session_key`	string	Yes	Session key from a previous tool call
`package_code`	string	Yes	The package code from search_topup_packages results

Parameters from the server's own tool schema.

RISK

Why buy_topup is rated Critical

This tool explicitly purchases a data package and initiates a Stripe checkout, committing real financial obligations. It falls squarely in the Financial category, which is the most severe. Misuse by an AI agent could result in unauthorized purchases and financial losses.

From the tool's definition 'Purchase a top-up data package' and 'Returns a Stripe checkout URL' — directly initiates a financial transaction via Stripe payment processing.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs buy_topup safely

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

buy_topup Approval-gated

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

View as policy code

policy.json

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

GATE THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Gitsim Chat, apply this rule, and every buy_topup call is checked against it from then on.

FAQ

Questions about buy_topup

What does the buy_topup tool do? +

Purchase a top-up data package for an existing eSIM. Returns a Stripe checkout URL. It is categorised as a Financial tool in the Gitsim Chat MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

What parameters does buy_topup accept? +

buy_topup accepts 3 parameters: iccid, session_key, package_code. Required: iccid, session_key, package_code. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on buy_topup? +

Register the Gitsim Chat MCP server in PolicyLayer and add a rule for buy_topup: 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 Gitsim Chat. Nothing to install.

What risk level is buy_topup? +

buy_topup 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 buy_topup? +

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

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

buy_topup is provided by the Gitsim Chat MCP server (https://chat.gitsim.com/api/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on Gitsim Chat, and thousands of servers like it.

This server

All 9 Gitsim Chat tools → Critical-risk tools on this server →

Across the catalogue

buy_now on Ebay → All critical-risk MCP tools → The MCP Attack Database →

Guides

Govern MCP payment tools →Human-in-the-loop →Tool call approval →