24/7 fiat currency rates — even when markets sleep.
Forex markets close every weekend for 48 hours. Windy's Fiat247 uses cryptocurrency markets — which never close — to calculate reliable fiat cross-rates like GBP/USD, EUR/USD, and AUD/USD around the clock. The same methodology trusted by institutions for crypto pricing, now applied to fiat currencies.
Deep Dive: Fiat247
How crypto markets solve the weekend forex blackout
24/7/365
Continuous coverage
20+
Fiat cross-rates
100+
Exchange sources
99.99%
Uptime
48 hours of market darkness every week.
Traditional forex markets shut down Friday evening and don't reopen until Sunday night. That's over 2,600 hours per year with no official exchange rate data — leaving treasury teams, risk managers, and global payment systems in the dark.
Weekend closures
Friday 5 PM to Sunday 5 PM EST — 48 hours with no interbank rates for major currency pairs.
Weekend news moves markets
Elections, geopolitical crises, central bank signals, and policy shifts don't wait for Monday. Traditional forex misses it all.
Holiday gaps
Bank holidays, regional closures, and national events create additional unpredictable data gaps.
Business doesn't stop
E-commerce, global payments, and risk systems run 24/7 — but forex data doesn't keep up.
Crypto markets never close — so we use them.
While forex markets sleep, cryptocurrency exchanges trade fiat pairs around the clock. We aggregate real trading activity from 100+ exchanges to derive accurate cross-rates.
Real trading data
Rates derived from actual market activity on live crypto exchanges, not estimates or stale Friday closes.
Weekend news priced in
Geopolitical events, elections, and central bank signals move crypto-fiat pairs in real time — Fiat247 captures these shifts before Monday's open.
Multi-source validation
Cross-validated across multiple exchanges and multiple base assets for accuracy and reliability.
Quality weighted
Higher weight given to exchanges with tighter spreads, higher volumes, and fresher data.
How it works
4-stage pipelineCollect exchange data
Ingest real-time bid, ask, spread, and volume data from 100+ exchanges that trade crypto against fiat — BTC/GBP, ETH/EUR, BTC/AUD, and more.
Derive per-asset rates
For each crypto base asset, compute an implied fiat cross-rate. A single BTC price on one exchange is just a starting point — not the final answer.
Multi-source aggregation
Rates from multiple base assets (BTC, ETH, USDT, USDC) and multiple exchanges combined using quality-weighted aggregation — factoring in spread, volume, staleness, and exchange reliability.
Anomaly detection & validation
Outlier rates are flagged and excluded automatically. Cross-validation between independent derivation paths ensures the final composite rate is robust and auditable.
Example: Deriving GBP/USD
Aggregated across 4 base assets, 25 exchanges, weighted by volume, spread & freshness.
Same API, same reliability — now for fiat.
Access weekend fiat rates through the same REST, WebSocket, and FIX protocols you already use for crypto — no additional setup required.
Multi-protocol access
REST API, WebSocket streaming, FIX, and MCP protocol support.
50+ currency pairs
Major pairs plus emerging market currencies — all available around the clock.
Historical data
Full weekend and holiday data available via Snowflake, Datablocks, or S3 delivery.
EUR/USD
Live comparison
Tracks traditional FX within basis points.
During traditional forex market hours, Fiat247 rates closely track official rates. On weekends, rates reflect real market-driven supply and demand — and Monday openings typically converge with Fiat247 rates.
Cross-validated
Multiple base assets provide independent rate estimates.
Anomaly detection
Automatic flagging when derived rates diverge.
Transparent
Fully auditable from source data to final rate.
During market hours
Deviation vs. official| Pair | Typical | Max |
|---|---|---|
| GBP/USD | ±0.05% | 0.2% |
| EUR/USD | ±0.03% | 0.15% |
| JPY/USD | ±0.08% | 0.3% |
Small deviations expected due to crypto exchange fees, spread differences, and timing variations. Multi-source aggregation minimizes these effects.
Growing coverage across global currencies.
Fiat247 supports any fiat currency with active crypto trading pairs on major exchanges. New currencies are added automatically as coverage expands.
AED
UAE Dirham
ARS
Argentine Peso
AUD
Australian Dollar
BRL
Brazilian Real
CAD
Canadian Dollar
CHF
Swiss Franc
COP
Colombian Peso
EUR
Euro
GBP
British Pound
IDR
Indonesian Rupiah
JPY
Japanese Yen
MXN
Mexican Peso
NGN
Nigerian Naira
PLN
Polish Zloty
SGD
Singapore Dollar
TRY
Turkish Lira
UAH
Ukrainian Hryvnia
ZAR
South African Rand
Need a currency not listed? Contact us — if it has active crypto pairs, we can add it.
Built for teams that can't afford gaps.
Weekend Event Monitoring
Elections, sanctions, trade wars, and central bank surprises happen on weekends. See the market impact in real time through crypto-derived fiat rates — not Monday's gap open.
Treasury & Finance
Monitor multi-currency exposure in real time. Calculate hedge ratios and rebalancing needs before Monday's open.
Risk Analytics
Continuous VaR and stress testing with no data gaps in your models.
Global Payments
Quote accurate FX rates to customers anytime, even on bank holidays.
Quantitative Research
Build backtests and ML models with complete, gap-free price history. No more interpolation hacks.
Common Questions About Fiat247
During traditional forex market hours, Fiat247 rates closely track official rates — typically within ±0.03% for EUR/USD, ±0.05% for GBP/USD, and ±0.08% for JPY/USD. Rates are derived from real trading activity on 100+ cryptocurrency exchanges, cross-validated across multiple base assets for maximum reliability.
Stop losing 48 hours of market visibility every weekend.
Sign up and receive your API credentials instantly. Start streaming continuous fiat rates across REST, WebSocket, FIX, and MCP — with the same key you use for crypto.