---
title: "FX Margin & Cost Transparency Calculator"
method: POST
path: "/v1/tools/fx_margin_cost_transparency"
---

# FX Margin & Cost Transparency Calculator

`POST /v1/tools/fx_margin_cost_transparency`

## Request

- Base URL: `https://ainumbers.co`
- URL: `https://ainumbers.co/v1/tools/fx_margin_cost_transparency`
- Auth: none declared

Deconstruct FX spreads in real time. Compare up to 3 providers against mid-market rate, calculate implied margin in bps, and benchmark against corridor percentiles. Client-side. Works offline. Zero PII.

**Tool URL:** https://ainumbers.co/tools/209-fx-margin-cost-transparency.html
**AP2/Policy Mandate export:** yes

## Request body

- object
  - `currency_pair` string, required: ISO 4217 currency pair code, e.g. EURUSD, USDMXN
  - `mid_market_rate` number: Mid-market reference rate. If omitted, embedded indicative rate is used.
  - `transfer_amount` number: Transfer amount in base currency
  - `providers` object[], required: 1 to 3 provider quoted rates
    - `name` string
    - `quoted_rate` number, required

## Response `200`

Successful tool execution result

- object
  - `providers` object[]
    - `name` string
    - `quoted_rate` number
    - `margin_bps` number
    - `margin_pct` number
    - `cost_in_quote_ccy` number
  - `best_provider` object
  - `corridor_benchmark` object
  - `g20_fsb_target` object
  - `ap2_mandate` object

---

[API](https://skmtc.dev/ainumbers/apis/ainumbers-co-fintech-intelligence-suite.md) · [All operations](https://skmtc.dev/ainumbers/apis/ainumbers-co-fintech-intelligence-suite/llms.txt) · [OpenAPI document](https://skmtc.dev/ainumbers/apis/ainumbers-co-fintech-intelligence-suite/revisions/b462e4f5bb28?raw)