fix: enable Solana swaps via Chainflip with correct decimals

[0xApotheosis]

Summary

• Enable SOL ↔ ETH/BTC swaps that were previously blocked
• Fix amount calculation to use correct native decimals for each asset
• Fix output display to show human-readable amounts instead of scientific notation

Root Cause

Multiple issues were preventing Solana swaps from working:

1. Blocking logic: An if-block was returning "No rate available" for SOL↔ETH and SOL→BTC pairs before even calling Chainflip
2. Wrong decimals for API requests: The amount calculation used fromToken.decimals[toToken.symbol] which looked up decimals based on the destination token instead of using the source token's native decimals
3. Scientific notation in URL: JavaScript's 10 ** 18 can produce 1e+18 when stringified, which Chainflip couldn't parse
4. Wrong decimals for output display: The output amount used THORChain decimals instead of Chainflip native decimals

Changes

1. Remove blocking logic

Removed the if-block that blocked SOL↔ETH and SOL→BTC pairs - Chainflip now supports these.

2. Add getChainflipAssetId helper

Maps token/chain combinations to correct Chainflip asset identifiers:

• SOL → Sol.Sol
• BTC → Btc.Btc
• ETH → Eth.Eth
• USDT → Usdt.Eth

3. Add getChainflipDecimals helper

Returns correct native decimals for Chainflip assets:

• SOL: 9 decimals
• BTC: 8 decimals
• ETH: 18 decimals
• USDT: 6 decimals

4. Use BigInt for amount formatting

const amountInBaseUnits = BigInt(Math.round(numericAmount * 10 ** decimals)).toString()

Ensures the amount is formatted as a proper integer string (e.g., "1000000000") instead of scientific notation ("1e+9").

5. Fix output display decimals

Use getChainflipDecimals(toToken) for Chainflip swaps to correctly format the received amount.

Test Plan

• SOL → ETH: Enter 1 SOL, verify quote returns ~0.04 ETH
• ETH → SOL: Enter 1 ETH, verify quote returns ~23 SOL
• SOL → BTC: Enter 1 SOL, verify quote returns ~0.0014 BTC
• ETH → BTC: Verify THORChain still works for non-Solana pairs
• Output amounts display correctly (not in scientific notation)

🤖 Generated with Claude Code

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Project	Deployment	Review	Updated (UTC)
website-frontend	Ready	Preview, Comment	Jan 27, 2026 0:38am

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/solana-rates-blocked

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