FCS Real-Time Cryptocurrency Data API Documentation

Introduction

The FCS Crypto API provides comprehensive real-time and historical cryptocurrency market data, supporting over 1,500 cryptocurrencies and 5,000+ trading pairs. This documentation details how to integrate our API for:

• Real-time price tracking
• Historical rate analysis
• Technical indicators and market signals
• Currency conversion
• Supply and profile data

👉 Start integrating now with our developer-friendly JSON API.

API Overview

Key Features

• 35+ Exchange Sources: Aggregated data from major crypto exchanges
• Multiple Timeframes: Data granularity from 1-minute to monthly intervals
• Technical Analysis: 14+ indicators including RSI, MACD, and moving averages
• High Availability: 99.9% uptime with enterprise-grade infrastructure

Authentication

All requests require an access_key parameter with your API key. Obtain your key upon registration.

https://fcsapi.com/api-v3/crypto/ENDPOINT?access_key=YOUR_KEY

Core Endpoints

1. Real-Time Prices

Endpoint: /latest
Credit Cost: 1 per 100 records

# Get BTC/USD and ETH/USD rates
https://fcsapi.com/api-v3/crypto/latest?symbol=BTC/USD,ETH/USD

Response:

{
  "response": [
    {
      "s": "BTC/USD",
      "c": 95448.0,
      "h": 100850.0,
      "l": 94648.0,
      "tm": "2023-03-17 20:59:54"
    }
  ]
}

2. Historical Data

Endpoint: /history
Credit Cost: 1 per 300 candles

# Daily BTC/USD rates for January 2025
https://fcsapi.com/api-v3/crypto/history?symbol=BTC/USD&period=1d&from=2025-01-01

Supported Periods:
| Value | Description |
|-------|-------------|
| 1m | 1 minute |
| 1h | 1 hour |
| 1d | 1 day |

3. Technical Indicators

Endpoint: /indicators
Available Indicators:

| Indicator | Description |
|-----------|-------------|
| RSI14 | Relative Strength Index |
| MACD | Moving Average Convergence Divergence |
| STOCH | Stochastic Oscillator |

# BTC/USD hourly indicators
https://fcsapi.com/api-v3/crypto/indicators?symbol=BTC/USD&period=1h

Best Practices

Rate Limits

• 10 requests/minute per IP
• Batch requests using multiple IDs/symbols

Error Handling

Common response codes:

| Code | Meaning |
|------|---------|
| 200 | Success |
| 403 | Invalid API key |
| 429 | Rate limit exceeded |

FAQ

How often are prices updated?

Real-time endpoints refresh every 30-60 seconds. Historical data updates hourly.

Is there a free tier?

Yes! The free plan includes 500 monthly requests for testing.

👉 Upgrade your plan for higher limits and premium features.

Can I get all crypto prices at once?

Use symbol=all_crypto to retrieve 1,500+ rates in one request.

How do historical candles work?

Each candle contains:

• Open/High/Low/Close prices
• Volume
• Unix timestamp

Advanced Features

Bulk Requests

Fetch multiple endpoints simultaneously:

https://fcsapi.com/api-v3/crypto/multi_url?url[1]=history?id=78&url[2]=latest?symbol=BTC/USD

Market Cap Data

Endpoint: /cross
Includes:

• Circulating supply
• 24h volume
• Price in 10+ fiat currencies

Disclaimer

Data is provided for informational purposes only. FCS API isn't liable for trading losses. Prices may have 20-second delays. Always verify critical data through multiple sources.