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April 18, 2025

Currencies API Guide: Real-Time and Historical Exchange Rate Data

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Access to consistent and accurate exchange rates is critical for trading platforms, payment processors, fintech applications, and analytics systems. Whether you're supporting crypto-fiat conversions, cross-border payments, or historical auditing, reliable data is essential for precision, compliance, and performance.

This guide covers how the Currencies API delivers both real-time and historical FX data — along with how to use it across various applications.

Exchange rates define the value of one currency relative to another. This applies to:

  • Crypto-to-crypto pairs (e.g., ETH/BTC)
  • Crypto-to-fiat pairs (e.g., BTC/USD)
  • Fiat-to-fiat pairs (e.g., EUR/JPY)

Rates are influenced by trading volume, market depth, exchange-specific pricing models, regulations, and market behavior.

Exchange rate discrepancies occur due to:

  • Differing order book liquidity across exchanges
  • Fee structures and spreads applied by platforms
  • Geographic and regulatory constraints
  • Timing differences and data quality
  • Arbitrage behavior and user demand

A unified API that aggregates and normalizes data helps maintain consistency across use cases.

Currencies API supports a wide range of real-world applications across multiple industries:

  • Remittance Services: Deliver accurate real-time FX rates for money transfers. Use historical data for audits, dispute resolution, and regulatory reporting.
  • Travel & Hospitality: Convert booking prices in real time at checkout. Use timestamped historical rates for refunds, reconciliations, and multi-currency reporting.
  • E-commerce & Marketplaces: Display prices in local currencies based on current FX rates. Automate currency conversion for global product catalogs and billing systems.
  • Trading & Investment Platforms: Feed real-time rates into trading UIs, backtesting tools, and portfolio trackers. Support both fiat and crypto markets.
  • DeFi & Web3: Integrate live FX rates into smart contracts, on-chain oracles, and liquidity management tools.
  • Financial Services & Banking: Support multi-currency wallets, payment processing, and compliance tools with accurate and auditable exchange rates.
  • 100ms update intervals
  • Bid, ask, mid-market, and VWAP pricing
  • Streaming support via WebSocket and FIX
  • Delivered via REST, WebSocket, and JSON-RPC
  • Suitable for pricing engines, trading interfaces, and conversions at checkout
  • Time series data with granularity from 1 second to 1 day
  • OHLC format and VWAP available
  • 14+ years of data
  • Supports auditing, backtesting, and reconciliation workflows
  • Delivered via REST API with flexible parameters

When working with exchange rate data:

  • Timestamp validation: Always use the latest rates for live operations
  • Error handling: Implement fallback logic in case of downtime or latency
  • Rate limits: Throttle requests to match your plan
  • Data verification: Ensure pricing accuracy before using in financial workflows
1{
2  "time_period_start": "2016-01-01T00:00:00.0000000Z",
3  "time_period_end": "2016-01-01T00:01:00.0000000Z",
4  "rate_open": 430.58,
5  "rate_high": 430.58,
6  "rate_low": 430.58,
7  "rate_close": 430.58
8}
1{
2  "asset_id_base": "BTC",
3  "rates": [...],
4  "time": "2017-08-09T14:31:37.0520000Z"
5}
6
1{
2  "time": "2025-02-13T10:07:38.2687211Z",
3  "asset_id_base": "BTC",
4  "asset_id_quote": "USD",
5  "rate": 10000
6}
7

The Currencies API provides unified access to both live and historical exchange rate data — with low latency, full auditability, and support for crypto and fiat pairs.

Explore the docs or get an API key to begin integrating accurate FX data into your system.

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