FAQ: Frequently Asked Questions

What is Mila-ex?

Mila-ex is a unified Crypto Market Data API platform that normalizes real-time and historical data across 100+ cryptocurrency exchanges into a single, standardized REST/JSON interface.

Which exchanges does Mila-ex support?

Mila-ex supports major exchanges like Binance, Coinbase, Kraken, Bitfinex, Gate.io, Poloniex, Valr, and Luno, with new ones being added regularly.

Is Mila-ex free to use?

Yes — Mila-ex offers a free tier with generous request limits for developers testing integrations. Paid plans are available for higher throughput, advanced analytics, and premium exchange data access.

Does Mila-ex provide WebSocket or real-time streaming data?

Currently, Mila-ex offers REST API endpoints for tickers, OHLCV, and order books. WebSocket support is in active development and will allow real-time trade and order updates in a single unified stream.

What data depth does Mila-Ex provide?

Unlike basic aggregators that only provide simple prices, Mila-Ex offers Level 2 (L2) Order Books, recent trades (tick data), and OHLCV candles. We normalize this data across 112+ exchanges into a single, unified JSON format.

What is the latency of your API?

Mila-Ex is hosted on AWS (eu-west-1) with auto-scaling clusters. Our average global response time for REST calls is <250ms.

Is Mila-Ex compatible with Python and Node.js?

Yes. Because Mila-Ex is a standard RESTful JSON API, it works natively with any programming language. Whether you are building a Python crypto bot, a Node.js dashboard, or a Go-based trading engine.

How do I authenticate my requests?

All requests must include your generated API key in the x-api-key header.

What is the format for timestamps in your responses?

Timestamps are provided in Unix milliseconds (int64) for high-precision time-series tracking.

How can I track my remaining request quota programmatically?

Every response includes custom headers: X-Rate-Limit-Limit (max RPM), X-Rate-Limit-Remaining (remaining RPM), and X-Rate-Limit-Monthly (total monthly requests left).

What is the structure of a Mila-Ex error response?

We use a unified JSON schema for all errors, which includes a numeric Code, a Message, a detailed Description, and an Errors array for specific validation paths.

What does error code 104 'Operation not supported' mean?

This occurs when you request a specific dataset—like a Level 2 order book—from an exchange that does not natively support or provide that data.

Can I use Mila-ex to build an arbitrage bot?

Absolutely. Mila-ex was built with cross-exchange arbitrage in mind. It provides normalized price data, making it easy to detect and act on market inefficiencies.

What is the difference between the /orderbook and /orderbook/complete endpoints?

The /orderbook endpoint provides current open orders (bids and asks), while /orderbook/complete retrieves the completed order history for a specific market pair.

How do I handle inconsistencies in base or quote asset names across exchanges?

Mila-Ex normalizes asset names, though properties like baseLongName may not always be populated due to the limitations of specific underlying exchanges.

Can I fetch data for multiple symbols in a single call?

Yes, the GET /api/v1/exchange/tickers endpoint allows you to pass multiple symbols in a single query to retrieve ticker information in bulk.

Is historical market data available?

Yes. Mila-ex provides historical OHLCV data for supported pairs. Developers can retrieve it via the /ohlcv endpoint documented in the API docs.

How do I get my Mila-ex API key?

You can register for free at dashboard.milaex.com. Once signed in, your API key will be displayed in your developer dashboard under 'API Access.'

How do I find a list of all currently supported exchanges?

Use the GET /api/v1/exchange endpoint to receive a real-time list of all actively working exchanges in our network.

What is an 'Overall API Limit'?

The base /exchange endpoint has a global limit of 10,000 requests per minute (RPM). This is shared across all users to maintain system-wide stability.

Does Mila-ex store or manage user funds?

No. Mila-ex is a data API platform only. It does not hold custody of any assets or execute trades. You can safely use it for analytics, arbitrage scanning, and integration without financial exposure.