Add MEXC Assessment Zone trading pair support #2973
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ZCHF/USDT was moved to MEXC's Assessment Zone, which hides it from the public API. This change: - Makes getMarkets() protected in ExchangeService to allow overrides - Adds Assessment Zone pair definitions to MexcService - Injects ZCHF/USDT into the markets list for trading Note: Requires API key whitelisting from MEXC Support to actually trade Assessment Zone pairs.
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ccxt methods like fetchOrderBook() and createOrder() validate symbols against the exchange's internal markets cache, not our service-level cache. Without this fix, ccxt would reject ZCHF/USDT with "symbol not found" even though getTradePair() succeeds.
When ccxt parses order responses, it may use markets_by_id to look up the market by its exchange-specific ID (e.g., 'ZCHFUSDT'). Without this, order.symbol might be the ID instead of the symbol, causing getPrecision() and other lookups to fail.
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Summary
getMarkets()protected in ExchangeService to allow subclass overridesmarketsarray (forgetTradePair(),getPrecision())exchange.markets(forfetchOrderBook(),createOrder())exchange.markets_by_id(for order response parsing)exchange.symbols(for symbol validation)Background
ZCHF/USDT was moved to MEXC's Assessment Zone around 08.01.2026. Assessment Zone pairs:
fetchMarkets()doesn't return them)Technical Details
ccxt validates symbols at multiple levels:
getMarkets()for pair validation and precision lookupexchange.marketsfor methods likefetchOrderBook()exchange.markets_by_idwhen parsing order responses (ID → symbol mapping)Without injecting into all three, trading would fail at different stages.
Test plan