Banco Familiar Exchange Rate API: PYG Buy and Sell Rates as JSON

Banco Familiar is a Paraguayan bank serving households and small businesses. Its home page lists cash and cheque or transfer buying and selling prices for the US dollar and euro, and a cash price for the Brazilian real. This guide shows how to read that board as JSON: what the rates mean, how they compare with the Banco Central del Paraguay official rate and with other banks in Paraguay, and the calls that return them.

What the Familiar board shows

• 3 currencies against the Paraguayan guarani: BRL, EUR and USD. Every value is PYG per 1 unit of the foreign currency.
• The cheque / transfer buy / sell (brl cash) pair. Paraguayan banks quote whole guaraníes per US dollar, euro and Brazilian real, often with separate cash, cheque and online-banking prices. The Banco Central del Paraguay publishes a daily reference rate. The Banco Central del Paraguay official rate is shown next to each row.
• USD on 15 November 2026: Familiar bought at 6000 and sold at 6310 PYG, a spread of 5.04%. The Banco Central del Paraguay official rate was 6215.89, so the bank's mid sat -0.98% from it.
• No timestamp on the bank's page. Familiar does not print a last-updated time, so bank_updated_at is null and captured_at (when AllRatesToday read the page) is the only time available.
• 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 spreads were USD 5.04%, EUR 7.88%, BRL 18.18%. 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 Familiar and other banks in Paraguay

USD on the 6 boards AllRatesToday reads in Paraguay, all captured on 15 November 2026 (the Banco Central del Paraguay official rate was 6215.89):

Familiar had the 4th narrowest USD spread of the 6. One call to /api/v1/bank-rates/py 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/py/familiarpy" \
  -H "Authorization: Bearer art_live_your_key"

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

{
  "bank": "familiarpy",
  "name": "Banco Familiar",
  "country": "py",
  "quote_ccy": "PYG",
  "bank_updated_at": null,
  "basis": "Cheque / transfer buy / sell (BRL cash)",
  "captured_at": "2026-11-15T11:37:43.725Z",
  "rates": [
    {"ccy":"BRL","buy":1000,"sell":1200,"mid":1100,"spread_pct":18.182,"official":1102.83,"vs_official_pct":-0.257,"basis":"cash"},
    {"ccy":"EUR","buy":6580,"sell":7120,"mid":6850,"spread_pct":7.883,"official":6867.94,"vs_official_pct":-0.261},
    {"ccy":"USD","buy":6000,"sell":6310,"mid":6155,"spread_pct":5.037,"official":6215.89,"vs_official_pct":-0.98}
  ],
  "disclaimer": "…",
  "attribution": { … }
}

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

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

{
  "bank": "familiarpy",
  "name": "Banco Familiar",
  "country": "py",
  "quote_ccy": "PYG",
  "bank_updated_at": null,
  "basis": "Cheque / transfer buy / sell (BRL cash)",
  "captured_at": "2026-11-15T11:37:43.725Z",
  "ccy": "USD",
  "buy": 6000,
  "sell": 6310,
  "mid": 6155,
  "spread_pct": 5.037,
  "official": 6215.89,
  "vs_official_pct": -0.98,
  "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 Familiar on its own website, collected by AllRatesToday",
    "bank_url": "https://www.familiar.com.py/",
    "url": "https://allratestoday.com/bank-exchange-rate-api/py/familiarpy/",
    "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/py/familiarpy?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/py/familiarpy/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 Familiar's USD row
const r = await client.bankRates('py', { bank: 'familiarpy', ccy: 'USD' });
console.log(`Familiar buys USD at ${r.buy}, sells at ${r.sell} PYG`);

// The board as it stood on a past day
const past = await client.bankRates('py', { bank: 'familiarpy', 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/py/familiarpy",
    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 Central del Paraguay rate is the one tax, accounting and customs rules in Paraguay name; nobody transacts at it. Familiar'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 Central del Paraguay endpoint when a rule asks for the official rate.

FAQ

Where do the Banco Familiar rates come from?

From the bank's own public rates page (https://www.familiar.com.py/), read hourly. AllRatesToday does not change the numbers: each row is the buy and sell price Familiar shows, with the mid, the spread and the Banco Central del Paraguay rate added.

Are these the official PYG exchange rates?

No. They are Familiar's retail prices for customers. The official rate in Paraguay is the Banco Central del Paraguay 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 Familiar board updated?

AllRatesToday reads the page every hour. The bank prints no timestamp, so captured_at tells you when the rates were read.

Can I get Familiar 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.