subfactorial

SERVERScorpTech x402 API SOURCEhttps://scorptech.it.com/api/x402/mcp

Low RISK CLASS

Category Read

Parameters 11 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/com-it-scorptech-x402/subfactorial.md

WHAT IT DOES

What subfactorial does on ScorpTech x402 API

AI agents call subfactorial to retrieve information from ScorpTech x402 API without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

Parameter	Type	Required	Description
`n`	integer	Yes

Parameters from the server's own tool schema.

RISK

Why subfactorial is rated Low

Even though subfactorial only reads data, uncontrolled read access leaks sensitive information and racks up API costs: an agent caught in a retry loop can make thousands of calls a minute without anyone noticing.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs subfactorial safely

PolicyLayer is an MCP gateway: it sits between your AI agents and ScorpTech x402 API, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For subfactorial, this is the rule to start with:

subfactorial Allowed

subfactorial is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

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

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect ScorpTech x402 API, apply this rule, and every subfactorial call is checked against it from then on.

FAQ

Questions about subfactorial

What does the subfactorial tool do? +

The subfactorial !n, the number of derangements of n objects. !0 is 1, !1 is 0, !2 is 1, and !5 is 44. n runs from 0 to 4096. Past 15 digits the value is a decimal string. Price: $0.001 USDC per successful call (x402, Solana). Same tool over HTTPS: POST https://scorptech.it.com/api/x402/v1/subfactorial. It is categorised as a Read tool in the ScorpTech x402 API MCP Server, which means it retrieves data without modifying state.

What parameters does subfactorial accept? +

subfactorial accepts 1 parameter: n. Required: n. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on subfactorial? +

Register the ScorpTech x402 API MCP server in PolicyLayer and add a rule for subfactorial: 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 ScorpTech x402 API. Nothing to install.

What risk level is subfactorial? +

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

Can I rate-limit subfactorial? +

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

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

subfactorial is provided by the ScorpTech x402 API MCP server (https://scorptech.it.com/api/x402/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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