compare_crypto_exchanges

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Compare the price of one crypto asset on two exchanges, converting both legs to USD, and report the premium of leg B over leg A. Coinbase, OKX, Upbit and Kraken market data delivery is unavailable pending written redistribution permission. Other exchanges remain under individual rights review; public access is not a redistribution licence. The unchanged default second leg is Upbit/KRW and therefore currently returns a rights error. Select another available exchange explicitly. Example calculation: the Korean "kimchi premium" — e.g. base:'BTC', exchange_a:'binance', quote_a:'USDT', exchange_b:'bithumb', quote_b:'KRW' -> premium_pct is how much more expensive BTC is on bithumb (in USD terms) than on binance. Args: - base: asset symbol, e.g. 'BTC', 'ETH', 'XRP' (default BTC) - exchange_a / quote_a: first leg (defaults binance / USDT) - exchange_b / quote_b: second leg (defaults upbit / KRW) - Supported quotes: USD, USDT, USDC (treated as 1 USD, noted in output) and KRW (converted with the latest FRED DEXKOUS KRW-per-USD rate). Returns: {base, legs:[{exchange, symbol, last, last_usd}], premium_pct, fx:{pair:'USD/KRW', rate, date, source:'FRED DEXKOUS'}, notes}. premium_pct = (leg_b_usd / leg_a_usd - 1) * 100. Examples: - "compare BTC on two available exchanges" -> {exchange_a:'binance', quote_a:'USDT', exchange_b:'bybit', quote_b:'USDT'} - "ETH premium bithumb vs binance" -> {base:'ETH', exchange_a:'binance', quote_a:'USDT', exchange_b:'bithumb', quote_b:'KRW'} - Don't use for a single price (get_crypto_ticker) or history (get_crypto_ohlcv). Errors: unknown symbol on either exchange -> check the exchange's market list (upbit/bithumb list KRW pairs only); unsupported quote currency lists the supported ones; FRED key missing blocks KRW conversion with a hint.