APIs › Business & Financial Calculators › Discount Calculator

Discount Calculator

Applies sequential or parallel percentage and fixed discounts, returning the effective discount rate and the order of application.

POST /v1/business/discount-calculate $0.005 per call

Specification

Endpoint

POST /v1/business/discount-calculate

Price

$0.005 per call · tier basic_data

Payment

x402 on X Layer (chain 196) · settled in USDG or USDT0 · schemes exact, aggr_deferred

Data source

Deterministic decimal arithmetic on caller-supplied input

Timeout

15 seconds

Max request

256 KB

Version

1.0.0

Calling it

The first call returns a 402 with the payment challenge. Retry with a signed authorisation in the X-PAYMENT header — see the payment guide for the exact shape.

curl -i -X POST "https://api.dana-edu.pp.ua/v1/business/discount-calculate" \
  -H "content-type: application/json" \
  -d '{ ... }'

Response

Real output, captured by running this endpoint at build time — not written by hand. Volatile fields such as timestamps are elided. Captured 2026-07-30.

{
  "original_price": "1000.00",
  "final_price": "720.00",
  "total_discount": "280.00",
  "effective_discount_percent": "28.0000",
  "application": "sequential",
  "steps": [
    {
      "name": "Seasonal",
      "percent": "20",
      "amount": null,
      "base": "1000.00",
      "discount": "200.00",
      "running_price": "800.00"
    },
    {
      "name": "Loyalty",
      "percent": "10",
      "amount": null,
      "base": "800.00",
      "discount": "80.00",
      "running_price": "720.00"
    }
  ],
  "note": "Sequential discounts compound downward: 20% then 10% is 28% overall, not 30%, because each applies to the already-reduced price."
}

Every response is wrapped in the same envelope: data plus warnings, sources, confidence, informational_only and a measured processing_ms. See the envelope reference.

Related endpoints