FX & Currencies, resources
Why Real-Time Forex Data Is the Foundation of Every Serious Currency Tool
09 Sept 2026
The foreign exchange market is the largest and most liquid market in the world, turning over more than $7.5 trillion a day. Yet for anyone trying to build on top of it — a dashboard, an alerting system, a backtest, an analytics product — the hardest part is almost never the strategy or the interface. It is getting a price feed you can actually trust.
Forex has no central exchange and no single tape. Prices are formed across a decentralised network of banks, brokers and market makers spread over every time zone, with trading sessions that overlap and hand off around the clock. Every data vendor is therefore aggregating from a slightly different set of sources, and the quality gap between a professional feed and a free one is far wider than most people expect. If you are evaluating a forex data API — whether you are a discretionary trader wiring up custom alerts or a team shipping a fintech product — it is worth understanding what actually separates the two, and where a service such as the Infoway API fits.
Why “Good Enough” Forex Data Usually Isn’t
Most developers start with whatever is free and closest to hand: a generic exchange-rate endpoint, a scraped quote, a broker widget. These are fine for showing an approximate EUR/USD rate on a marketing page. They break down the moment real money or real decisions depend on them, and they break down in predictable ways.
Latency that quietly invalidates the logic. Many free forex sources carry a 10-to-30-minute delay. That is invisible on a conversion calculator and fatal for anything that reacts to price. An alert that fires 20 minutes late is not an early warning — it is a history lesson.
Request limits that don’t survive real usage. Free tiers often cap you at a few hundred calls a day. A dashboard refreshing several currency pairs every few seconds burns through that before the London session even opens.
No streaming. Free APIs are almost always poll-only: you ask, they answer. In a market that moves continuously, polling means you are always looking at a slightly stale snapshot and never at the tick that just happened.
Pip-level disagreement between sources. Two free feeds will often quote the same pair a few pips apart. Since pips are the unit forex profit and loss is measured in, an inconsistent feed makes it impossible to reason precisely about spreads, slippage or performance.
What a Professional Forex Feed Actually Gives You
At the other extreme sits institutional data from the large terminals, where a full forex feed can cost anywhere from five to six figures a year. That is built for banks and hedge funds, not for an indie developer building a currency overlay or a small team launching a trading-tools product. Between those poles, a newer class of financial data APIs has emerged to give smaller teams professional-grade data without the terminal price tag. When you compare them, four things matter more than the length of the feature list:
- Measured latency. Not “real-time” as a marketing word, but an actual number. Sub-100ms between a market event and the data reaching your client is the bar for anything latency-sensitive.
- Feed stability. A published uptime SLA, and a connection that does not silently die under load. Reconnect behaviour matters as much as raw speed.
- Source quality. Data aggregated from major market makers, not stitched together from public endpoints, so quotes stay consistent to the pip.
- One interface for REST and streaming. Snapshot queries for dashboards and historical work; a persistent WebSocket for anything that needs to react. Ideally the same symbols and the same field names across both.
How Infoway’s Forex API Is Built
The Infoway forex API aggregates pricing from major market makers and delivers it through a unified REST and WebSocket interface. For currencies specifically, that means genuine real-time rates with latency consistently measured under 100ms and a 99.6% uptime SLA. The same account is used across quant systems, AI-driven analysis platforms and exchange back ends, so the feed is built for continuous production use rather than occasional lookups.
Coverage runs to 85 currency pairs — every major, the full set of crosses, and a number of exotics including USD/CNY and USD/CNH, USD/HKD, USD/SGD, USD/THB, USD/TWD and USD/RUB. The onshore and offshore yuan are quoted separately, and the spread between them can itself be a useful macro signal.
| Capability | Detail |
|---|---|
| Currency pairs | 85 — all majors, full crosses, selected exotics |
| Latest trade price | Most recent print, up to 100 pairs in one request |
| Bid / ask (order book) | Current best bid and ask per pair |
| Candlesticks (OHLCV) | 12 timeframes, from one minute to yearly |
| Historical depth | Minute data back three years; daily and above unrestricted |
| Real-time streaming | WebSocket push for trades, order book and candles; up to 600 symbols per connection |
| Latency | Under 100ms, market event to data availability |
The practical split is simple. REST queries are the right tool for dashboards that refresh every few seconds, for pulling history, and for backtests. The WebSocket connection is what you use when something has to react in real time — a price alert, an automated strategy, a live trading terminal — because the server pushes each update to you as it happens, with no polling and no wasted round trips. Both sides use the same pair symbols and the same field names, so combining a live stream with a historical query does not mean writing two different parsers.
One Key Beyond Forex
Currencies rarely trade in isolation from the wider macro picture, and tools tend to grow. The same Infoway API key that covers forex also covers equities across the US, Hong Kong, mainland China A-shares, Japan and India, plus crypto, commodities, precious metals and CFDs — all through the same REST and WebSocket interface. If a currency dashboard later needs to show gold, oil or the S&P alongside the majors, that is a symbol change rather than a second vendor integration and a second billing relationship.
Getting Started
New accounts on the Infoway site get a seven-day trial automatically — no credit card, no identity verification. The API key appears in the dashboard immediately, and the trial covers every market and data type, at 60 REST requests per minute and up to 10 simultaneous WebSocket subscriptions. That is enough to build and test a full forex tool end to end before deciding whether to move onto a paid plan.
FAQ
When is the forex market actually open?
Twenty-four hours a day, five days a week. Trading opens Sunday evening New York time with the Sydney session; the deepest liquidity is in the London session (roughly 3am–12pm ET) and the New York session (8am–5pm ET). The London–New York overlap, about 8am–12pm ET, is when spreads are usually tightest and volume highest.
What latency should I expect?
Under normal conditions, the measured gap between a market event and that data being available over WebSocket is under 100ms. REST adds a request round trip on top, which is why anything latency-sensitive should use the stream.
Is historical forex data included?
Yes. Minute-level history goes back three years; daily, weekly and higher timeframes have no lookback limit. History and the live feed share the same candle format.
What is the difference between USD/CNY and USD/CNH?
CNY is the onshore yuan, traded on the mainland and managed within a band by the People’s Bank of China. CNH is the offshore yuan, traded in Hong Kong and other international centres, and it moves more freely with global supply and demand. The two rates diverge, and that gap is watched as a sentiment indicator.
How many pairs can I request at once?
Up to 100 pairs in a single REST request by comma-separating the symbols, and up to 600 symbols on one WebSocket connection.
