CAC payback period calculator API

Compute CAC payback months = CAC / (ARPA_monthly * grossMargin) — how long gross profit takes to recoup acquisition cost — with a rating (<12 excellent, 12-18 good, >18 capital-intensive) and breakdown. Answers 'what is my CAC payback period','how many months to recoup CAC','is my payback period healthy'.

Price$0.01per request

MethodPOST

Route/v1/calc/saas-cac-payback

StatusLive

MIME typeapplication/json

Rate limit120/minute

CacheNo cache

saascacpaybackunit-economicsstartupmetricssalescalc

API URLhttps://x402.hexl.dev/v1/calc/saas-cac-payback

Integration docs

Example request

{
  "cac": 600,
  "arpaMonthly": 100,
  "grossMarginPct": 70
}

Example response

{
  "paybackMonths": 8.57,
  "rating": "excellent",
  "monthlyGrossProfitPerAccount": 70,
  "formula": "paybackMonths = CAC / (ARPA_monthly * grossMargin)",
  "breakdown": {
    "cac": 600,
    "arpaMonthly": 100,
    "grossMarginPct": 70
  }
}

Input schema

{
  "type": "object",
  "required": [
    "cac",
    "arpaMonthly"
  ],
  "properties": {
    "cac": {
      "type": "number",
      "description": "customer acquisition cost (currency)",
      "examples": [
        600
      ]
    },
    "arpaMonthly": {
      "type": "number",
      "description": "average monthly revenue per account (currency)",
      "examples": [
        100
      ]
    },
    "grossMarginPct": {
      "type": "number",
      "description": "gross margin 0-100 (default 100)",
      "examples": [
        70
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}