---
title: "Payment-processor fee and net received for Stripe, PayPal, and Square at their verified 2026 standard US rates — or reverse gross-up (what to charge to net a target)."
method: POST
path: "/v1/commerce/processor-fee"
tags: ["Commerce"]
---

# Payment-processor fee and net received for Stripe, PayPal, and Square at their verified 2026 standard US rates — or reverse gross-up (what to charge to net a target).

`POST /v1/commerce/processor-fee`

## Request

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

Payment-processor fee and net received for Stripe, PayPal, and Square at their verified 2026 standard US rates — or reverse gross-up (what to charge to net a target).

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: net: fee = amount*pct/100 + fixed; gross-up: charge = (target + fixed)/(1 - pct/100)

## Request body

- object
  - `processor` 'stripe' | 'paypal-checkout' | 'paypal-standard' | 'square-online' | 'square-inperson' | 'square-keyed'
  - `amount` number, required
  - `mode` 'net' | 'gross-up'

## 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)