---
title: "Order total from subtotal, discount, tax rate, and shipping — tax excludes shipping by default (toggle with taxShipping)."
method: POST
path: "/v1/commerce/order-total"
tags: ["Commerce"]
---

# Order total from subtotal, discount, tax rate, and shipping — tax excludes shipping by default (toggle with taxShipping).

`POST /v1/commerce/order-total`

## Request

- Base URL: `` (relative, and it does not resolve against the document’s source URL)
- URL: `/v1/commerce/order-total`
- Auth: none declared

Order total from subtotal, discount, tax rate, and shipping — tax excludes shipping by default (toggle with taxShipping).

Payment: x402 ($0.02 USDC on eip155:8453). Call unpaid to receive an HTTP 402 with requirements, then retry with the PAYMENT-SIGNATURE header. Method: afterDiscount = subtotal - discount; tax = (afterDiscount + (taxShipping? shipping:0)) * taxRate/100; total = afterDiscount + shipping + tax

## Request body

- object
  - `subtotal` number, required
  - `discountPct` number
  - `discountAmount` number
  - `taxRatePct` number
  - `shipping` number
  - `taxShipping` boolean

## Response `200`

Verified result + provenance (formula, sources, reproducible SHA-256 hash).

## Other responses

- `400`: Invalid input (no charge) — body echoes the JSON Schema.
- `402`: Payment required — PAYMENT-REQUIRED header carries the x402 accepts[] quote.

---

[API](https://skmtc.dev/x402toll/apis/tollbooth-verified-calculators-for-ai-agents.md) · [All operations](https://skmtc.dev/x402toll/apis/tollbooth-verified-calculators-for-ai-agents/llms.txt) · [OpenAPI document](https://skmtc.dev/x402toll/apis/tollbooth-verified-calculators-for-ai-agents/revisions/60cb70a3e1a5?raw)