Optimize MarketAPI: Consolidate Sources & Add Missing Currencies

[Okazakee]

Problem

The current MarketAPI implementation uses 9 different data sources for exchange rates, which adds complexity without clear benefits. Additionally, several major fiat currencies are missing.

Current Sources (9)

• Kraken (3 currencies)
• CoinGecko (25 currencies)
• CoinDesk (15 currencies)
• Yadio (3 currencies)
• YadioConvert (2 currencies)
• Coinbase (1 currency)
• Coinpaprika (1 currency)
• Exir (2 currencies)
• BNR (1 currency)

Issues

1. No fallback system — if a source fails, the request fails
2. Too many sources — increases maintenance burden and potential points of failure
3. Missing major currencies — several countries with large populations/economies are not supported

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Proposed Changes

1. Consolidate to 4 Sources

Source	Use Case	Currencies
Kraken	Major fiat pairs (high liquidity)	USD, EUR, GBP, CAD, JPY, AUD, CHF
CoinGecko	All other standard currencies	~50 currencies
Yadio	Parallel/unofficial rates	ARS, VES, CLP (countries with capital controls)
Exir	Iranian market	IRR, IRT

Sources to remove: Coinbase, Coinpaprika, CoinDesk, BNR, YadioConvert, Bitstamp

2. Add Missing Currencies (via CoinGecko)

Asia

• VND — Vietnamese Dong (100M+ population)
• PKR — Pakistani Rupee (220M+ population)
• BDT — Bangladeshi Taka (170M+ population)
• MMK — Myanmar Kyat

Middle East / Africa

• EGP — Egyptian Pound (100M+ population)
• MAD — Moroccan Dirham
• DZD — Algerian Dinar
• JOD — Jordanian Dinar

Latin America

• PEN — Peruvian Sol
• CRC — Costa Rican Colón
• DOP — Dominican Peso
• GTQ — Guatemalan Quetzal
• BOB — Bolivian Boliviano

Europe / Central Asia

• BGN — Bulgarian Lev (EU member)
• GEL — Georgian Lari
• KZT — Kazakhstani Tenge
• BYN — Belarusian Ruble

3. Add Fallback System

Implementing fallback logic so if Kraken fails for USD/EUR/GBP, the API falls back to CoinGecko automatically.

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Migration Notes

Currencies changing source:

Currency	From	To
CAD, AUD, CHF, JPY	CoinGecko	Kraken
CNY	Coinbase	CoinGecko
INR	Coinpaprika	CoinGecko
RON	BNR	CoinGecko
ANG, LBP	YadioConvert	CoinGecko
AMD, AWG, COP, HRK, ISK, KES, MZN, OMR, PYG, QAR, RSD, TZS, UGX, UYU, XAF, GHS	CoinDesk	CoinGecko

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Benefits

• ✅ Fewer external dependencies (9 → 4 sources)
• ✅ Easier maintenance
• ✅ More currencies supported
• ✅ Consistent data quality from established providers
• ✅ Simpler codebase (remove unused Source variants and parsing logic)

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Files to Update

• assets/fiatUnits.json — update source mappings, add new currencies
• rates/src/lib.rs — remove unused Source variants and their URL/parsing logic