Struct ExchangeClient 

pub struct ExchangeClient { /* private fields */ }

A client that fetches market data from a specific exchange.

All methods return Option and never panic; network or parse errors are silently mapped to None so callers can retry or fall back.

Implementations

impl ExchangeClient

pub fn new(exchange: Exchange) -> Self

Create a client for the given exchange.

pub fn binance() -> Self

Convenience constructor for Binance.

pub fn coingecko() -> Self

Convenience constructor for CoinGecko.

pub fn fetch_candles( &self, symbol: &str, interval: &str, limit: usize, ) -> Option<Vec<Candle>>

Fetch OHLCV kline candles.

• Binance – symbol is a trading pair like "BTCUSDT", interval is a Binance interval string ("1m", "5m", "1h", "1d", …), and limit is the number of candles (max 1000).

• CoinGecko – symbol is the coin id (e.g. "bitcoin"), interval is interpreted as the number of days of history ("1", "7", "30", "365"), and limit is currently unused (the API decides granularity from days).

pub fn fetch_prices( &self, symbol: &str, interval: &str, limit: usize, ) -> Option<Vec<Point>>

Fetch close prices as Points suitable for line charts.

Each point has x = timestamp (seconds) and y = close price.

• Binance – uses klines; x is the candle open time.
• CoinGecko – uses the market_chart endpoint which returns price samples at varying resolution depending on days.

pub fn fetch_spot_price(&self, symbol: &str) -> Option<f64>

Fetch the current spot (last traded) price.

• Binance – uses /api/v3/ticker/price.
• CoinGecko – uses /api/v3/simple/price.