# LLM Cost & Capacity Calc – Monthly Budget Projection

> LLM Cost & Capacity Calc – Monthly Budget Projection is a paid API for AI agents from llm-cost-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-30).

Forecasts monthly and yearly LLM API spend from daily request volume, token counts, and per-million-token prices, with optional growth rate and per-user cost breakdown.

## Facts

- Endpoint: GET https://llm-cost-calc.x402tookit.com/monthly-budget?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/llm-cost-capacity-calc-monthly-budget-projection-158f8034
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Kin8-TeKRXq8DaP4knBg-

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability llm-cost-capacity-calc-monthly-budget-projection-158f8034
```

Example prompt: Can you project my monthly LLM costs for the next 12 months? I'm running 20000 requests per day, each with 500 input tokens and 300 output tokens, at $2.50 per million input tokens and $10 per million output tokens, with 8% monthly growth and 500 active users.

## When to prefer this

Use this endpoint when you need a multi-month forward-looking cost forecast for LLM API usage, especially when growth rate and per-user economics matter. It is more appropriate than a simple per-call cost calculator when you need to model trajectory, total budget envelopes, or unit economics over time. Choose this over point-in-time cost endpoints when planning budgets, pricing a SaaS product, or preparing financial projections.

## Known failure modes

- Missing required parameters (requestsPerDay, inputTokens, outputTokens, inputPricePerMTok, outputPricePerMTok) returns a validation error
- months value outside 1–60 range may be rejected or clamped
- Negative token counts or prices may produce nonsensical results
- Payment failure (x402) if USDC balance is insufficient
- Very high growth rates may produce overflow or implausibly large projections without error

## How this service works

Forecast monthly and yearly LLM spend from daily requests, tokens and prices, with monthly growth and per-user cost.

## Output

Returns a month-by-month projection array (cost, request volume, month number), plus summary figures: month 1 cost, final month cost, total projected cost, average monthly cost, cost per request, and optionally cost per user per month. Also includes metadata like the as-of timestamp and any disclaimer or warning flags.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "requestsPerDay",
      "inputTokens",
      "outputTokens",
      "inputPricePerMTok",
      "outputPricePerMTok"
     ],
     "properties": {
      "users": {
       "type": "integer",
       "description": "Active users, to compute cost per user per month"
      },
      "months": {
       "type": "integer",
       "description": "Months to project, 1 to 60 (default 12)"
      },
      "inputTokens": {
       "type": "number",
       "description": "Input tokens per request"
      },
      "outputTokens": {
       "type": "number",
       "description": "Output tokens per request"
      },
      "requestsPerDay": {
       "type": "number",
       "description": "Requests per day at the start"
      },
      "inputPricePerMTok": {
       "type": "number",
       "description": "Price per million input tokens"
      },
      "outputPricePerMTok": {
       "type": "number",
       "description": "Price per million output tokens"
      },
      "monthlyGrowthPercent": {
       "type": "number",
       "description": "Usage growth per month in percent (default 0)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "totalCost": {
       "type": [
        "null",
        "number"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
      
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/llm-cost-capacity-calc-monthly-budget-projection-158f8034/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from llm-cost-calc.x402tookit.com](https://www.zero.xyz/host/llm-cost-calc.x402tookit.com/llms.txt)