Banco Monex Exchange Rate API: MXN Buy and Sell Rates as JSON

Banco Monex is a Mexican bank that specialises in foreign exchange and payments for companies. Its home page ticker lists indicative buying and selling prices for the US dollar, euro, Canadian dollar and pound sterling. This guide shows how to read that board as JSON: what the rates mean, how they compare with the Banco de México official rate and with other banks in Mexico, and the calls that return them.

What the Monex board shows

• 4 currencies against the Mexican peso: CAD, EUR, GBP and USD. Every value is MXN per 1 unit of the foreign currency.
• The indicative buy / sell (tipo de cambio informativo) pair. Mexican banks post a branch-counter (ventanilla) buying and selling price in pesos per US dollar, and often only a handful of other currencies. Banco de México's FIX rate is a market reference published each business day; bank counter prices sit a few percent either side of it. The Banco de México official rate is shown next to each row.
• USD on 15 November 2026: Monex bought at 17.58 and sold at 19.43 MXN, a spread of 10.00%. The Banco de México official rate was 18.5525, so the bank's mid sat -0.26% from it.
• The bank's own timestamp. The page prints a last-updated stamp (Viernes 13, 11:59 pm on the board above), returned as bank_updated_at next to our captured_at.
• Every day's board is kept permanently, from 15 November 2026, the day collection started. Read one past day with ?date=, or a range for one currency with the /history endpoint (paid plans).

Spreads across the board

On the 15 November 2026 board the tightest spreads were USD (10.00%), GBP (10.01%), CAD (10.02%) and the widest EUR (10.04%), CAD (10.02%), GBP (10.01%). Spread is (sell − buy) ÷ mid: what a round trip through the bank costs, before any fees. The API returns it on every row as spread_pct, so you can rank currencies or alert when a bank widens its board.

USD at Monex and other banks in Mexico

USD on the 5 boards AllRatesToday reads in Mexico, all captured on 15 November 2026 (the Banco de México official rate was 18.5525):

Monex had the 4th narrowest USD spread of the 5. One call to /api/v1/bank-rates/mx returns every board in the table at once.

Get the board (REST)

You need an API key; the free key works. The full board:

curl "https://allratestoday.com/api/v1/bank-rates/mx/monex" \
  -H "Authorization: Bearer art_live_your_key"

What comes back (the 15 November 2026 board, first three rows):

{
  "bank": "monex",
  "name": "Banco Monex",
  "country": "mx",
  "quote_ccy": "MXN",
  "bank_updated_at": "Viernes 13, 11:59 pm",
  "basis": "Indicative buy / sell (tipo de cambio informativo)",
  "captured_at": "2026-11-15T11:23:01.153Z",
  "rates": [
    {"ccy":"CAD","buy":12.33,"sell":13.63,"mid":12.98,"spread_pct":10.015,"official":null,"vs_official_pct":null},
    {"ccy":"EUR","buy":19.4,"sell":21.45,"mid":20.425,"spread_pct":10.037,"official":20.5085,"vs_official_pct":-0.407},
    {"ccy":"GBP","buy":23.25,"sell":25.7,"mid":24.475,"spread_pct":10.01,"official":null,"vs_official_pct":null},
    … 1 more currencies
  ],
  "disclaimer": "…",
  "attribution": { … }
}

One currency, with the row fields at the top level:

curl "https://allratestoday.com/api/v1/bank-rates/mx/monex?ccy=USD" \
  -H "Authorization: Bearer art_live_your_key"

{
  "bank": "monex",
  "name": "Banco Monex",
  "country": "mx",
  "quote_ccy": "MXN",
  "bank_updated_at": "Viernes 13, 11:59 pm",
  "basis": "Indicative buy / sell (tipo de cambio informativo)",
  "captured_at": "2026-11-15T11:23:01.153Z",
  "ccy": "USD",
  "buy": 17.58,
  "sell": 19.43,
  "mid": 18.505,
  "spread_pct": 9.997,
  "official": 18.5525,
  "vs_official_pct": -0.256,
  "disclaimer": "Retail buy/sell rates as displayed on each bank’s own website at capture time, quoted as home currency per 1 unit of foreign currency. Indicative only: banks change these through the day, apply them at the counter or in-app, and they are not official or reference rates. For the rate a regulation names, use the central-bank endpoints.",
  "attribution": {
    "source": "Board rates published by Banco Monex on its own website, collected by AllRatesToday",
    "bank_url": "https://www.monex.com.mx/portal/",
    "url": "https://allratestoday.com/bank-exchange-rate-api/mx/monex/",
    "terms": "Public pages that show the rates need a visible link to allratestoday.com"
  }
}

The board as it stood on a past day:

curl "https://allratestoday.com/api/v1/bank-rates/mx/monex?date=2026-11-15" \
  -H "Authorization: Bearer art_live_your_key"

One currency over a date range, one row per day (paid plans; add &format=csv, xml or xlsx for a file):

curl "https://allratestoday.com/api/v1/bank-rates/mx/monex/history?ccy=USD&from=2026-11-15&to=2026-11-15" \
  -H "Authorization: Bearer art_live_your_key"

JavaScript

npm install @allratestoday/sdk

import { AllRatesToday } from '@allratestoday/sdk';

const client = new AllRatesToday({ apiKey: 'art_live_your_key' });

// Banco Monex's USD row
const r = await client.bankRates('mx', { bank: 'monex', ccy: 'USD' });
console.log(`Monex buys USD at ${r.buy}, sells at ${r.sell} MXN`);

// The board as it stood on a past day
const past = await client.bankRates('mx', { bank: 'monex', date: '2026-11-15' });
console.log(past.snapshot_date, past.rates.length);

Python

import requests

r = requests.get(
    "https://allratestoday.com/api/v1/bank-rates/mx/monex",
    headers={"Authorization": "Bearer art_live_your_key"},
    timeout=10,
)
r.raise_for_status()
for row in r.json()["rates"]:
    print(row["ccy"], row["buy"], row["sell"], row["spread_pct"])

Board rate or official rate?

The Banco de México rate is the one tax, accounting and customs rules in Mexico name; nobody transacts at it. Monex's board is the price a customer actually gets. The API puts both on every row: official is the central bank's rate for the same currency and vs_official_pct is how far the bank's mid sits from it. Use the board to show customers a real price, compare banks for a remittance, or keep a dated record of what the bank quoted; use the Banco de México endpoint when a rule asks for the official rate.

FAQ

Where do the Banco Monex rates come from?

From the bank's own public rates page (https://www.monex.com.mx/portal/), read hourly. AllRatesToday does not change the numbers: each row is the buy and sell price Monex shows, with the mid, the spread and the Banco de México rate added.

Are these the official MXN exchange rates?

No. They are Monex's retail prices for customers. The official rate in Mexico is the Banco de México rate, which the API returns as official on each row where the central bank has one, and in full from the central-bank endpoint.

How often is the Monex board updated?

AllRatesToday reads the page every hour. The bank's own last-updated stamp is returned as bank_updated_at, so you can tell a fresh read of an unchanged board from a new board.

Can I get Monex rates for a past date?

Yes, from 15 November 2026 onward; every day's board is kept permanently. Add ?date=YYYY-MM-DD for one day: the response is the board captured that day, or the nearest earlier day within five days, with date_requested and snapshot_date added. For a range, /history?ccy=USD&from=…&to=… returns one row per day as JSON, CSV, XML or XLSX on paid plans.

Do I need an API key?

Yes. Commercial bank boards need an API key; any plan works, the free key included, and each call counts against the plan. Public pages or widgets that show the rates need a visible link to allratestoday.com.