npv_irr
Investment appraisal for a cash-flow series: NPV at a discount rate, IRR (all roots for non-conventional flows), MIRR, profitability index, simple and discounted payback; with dates gives Excel-compatible XNPV and XIRR. POST JSON body {cashFlows, ratePct, dates?}. Price: $0.003 USDC per successfu...
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What npv_irr does on ScorpTech x402 API
AI agents call npv_irr 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 |
|---|---|---|---|
dates | array | — | Optional YYYY-MM-DD date per cash flow for XNPV / XIRR (Actual/365) |
ratePct | number | — | Discount rate per period (or per year with dates), percent |
cashFlows | array | Yes | Cash flows per period starting at t=0 (investments negative) |
financeRatePct | number | — | MIRR finance rate (default ratePct) |
reinvestRatePct | number | — | MIRR reinvestment rate (default ratePct) |
Parameters from the server's own tool schema.
Why npv_irr is rated Low
Even though npv_irr 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
The rule that runs npv_irr 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 npv_irr, this is the rule to start with:
npv_irr is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect ScorpTech x402 API, apply this rule, and every npv_irr call is checked against it from then on.
Questions about npv_irr
Investment appraisal for a cash-flow series: NPV at a discount rate, IRR (all roots for non-conventional flows), MIRR, profitability index, simple and discounted payback; with dates gives Excel-compatible XNPV and XIRR. POST JSON body {cashFlows, ratePct, dates?}. Price: $0.003 USDC per successful call (x402, Solana). Same tool over HTTPS: POST https://scorptech.it.com/api/x402/v1/npv-irr. It is categorised as a Read tool in the ScorpTech x402 API MCP Server, which means it retrieves data without modifying state.
npv_irr accepts 5 parameters: dates, ratePct, cashFlows, financeRatePct, reinvestRatePct. Required: cashFlows. The full parameter table on this page comes from the server's own tool schema.
Register the ScorpTech x402 API MCP server in PolicyLayer and add a rule for npv_irr: 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.
npv_irr is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the npv_irr 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.
Set action: deny in the PolicyLayer policy for npv_irr. 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.
npv_irr 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.
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