Banco Central del Paraguay Exchange Rate API: Official PYG Rates as JSON

The Banco Central del Paraguay publishes the official exchange rates that accounting, tax, and customs rules in Paraguay reference — published official rates, not moving market prices. This guide shows how to pull them as JSON: via a REST endpoint or the zero-dependency bcp-exchange-rate npm package.

What the BCP publishes

• ~26 currencies against the guaraní — the daily planilla de cotizaciones, including gold and SDR.
• History back to 2016 — queryable by exact date or as a time series.
• The bank's own publication date on every response, so a rate is always citable.
• No gaps to trip over — weekends and Paraguayan holidays resolve to the most recent published planilla and are flagged explicitly.

The USD/PYG rate anchors the planilla: Paraguayan customs valuation, accounting, and contracts settle against the BCP reference.

Why official rates, not market rates

A live mid-market feed answers "what is USD/PYG trading at right now?" — the right tool for checkouts and dashboards. But accountants, auditors, and tax authorities ask a different question: "which rate were you required to use for this date?" That answer comes from the Banco Central del Paraguay's published rates, and it never changes after publication.

Get the latest rates (REST)

curl "https://allratestoday.com/api/v1/central-bank/bcp/latest" \
  -H "Authorization: Bearer YOUR_API_KEY"

The response is the bank's most recent published data — every rate and the publication date. The latest rates are available on every plan, including the free tier (300 requests/month, no credit card).

The npm SDK

npm install bcp-exchange-rate

import { getRate, getLatestRates } from 'bcp-exchange-rate';

// One pair at the official BCP rate
const pair = await getRate('USD', 'PYG', { apiKey: 'art_live_...' });
console.log(pair.rate, pair.rate_date);

// The bank's full published table
const table = await getLatestRates({ apiKey: 'art_live_...' });
console.log(table.rate_date, table.rates.length);

Zero dependencies, TypeScript types included, and it runs anywhere fetch exists — Node 18+, Bun, Deno, and edge runtimes.

Historical rates for an invoice date

import { getRatesForDate, getHistory } from 'bcp-exchange-rate';

// The official rates for an invoice date — non-publication days return
// the most recent published date, flagged via published_on_requested_date.
const day = await getRatesForDate('2026-06-30', { apiKey: 'art_live_...' });

// Time series for one pair
const series = await getHistory(
  { source: 'USD', target: 'PYG', from: '2026-01-01' },
  { apiKey: 'art_live_...' }
);

Historical dates and time series need a paid plan; the latest rates stay free.

Published vs derived pairs

If the BCP does not print a pair directly, the API resolves it from the bank's published rates — an inverse, or a cross rate via PYG — and flags it derived: true with the method used. Official and computed values are never silently mixed, which is exactly the distinction an auditor will ask about.

A decade of guaraní history

The series runs from 2016, spanning the guaraní's slide from about 5,700 to past 7,900 per dollar and back — the official record for invoice-date lookups and audits in one of South America's most stable-inflation economies.

FAQ

Does the Banco Central del Paraguay have an official exchange rate API?

The BCP publishes its official rates on its own site, and AllRatesToday serves the same published rates as clean JSON via REST or the bcp-exchange-rate npm package. The latest table is free.

How often do Banco Central del Paraguay rates update?

Once per business day, each afternoon Asunción time. These are published reference rates, not moving market prices — every API response carries the publication date so you can cite it.

Can I get the BCP rate for a past date, like an invoice date?

Yes. The /central-bank/bcp/rates-for-date endpoint returns the official rates for any archived date. Non-publication days resolve to the most recent published date and are flagged, so your audit trail stays honest. Historical dates require a paid plan; latest rates are free.