Update relay fees doc

[pedromcunha]

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Project	Status	Preview	Updated (UTC)
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Claude finished @pedromcunha's task in 47s —— View job

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Code Review

• Gather context and read changed files
• Review changes against documentation standards
• Post review feedback

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Overall this is a solid update — the new volume tier table, fee category definitions, expanded price impact descriptions, and Fee Sponsorship section are all clear and well-structured. A few minor items:

1. Inconsistent casing: "USDs" vs "USDS" (fees.mdx:32)

Line 31 uses USDS (uppercase), but line 32 uses USDs (mixed case):

- **Stablecoin swaps**: ...USDe and USDS.
- **Major token swaps**: ...USDe and USDs).

Should be consistent — likely USDS in both places.

Fix this →

2. Missing newline at end of file (fees.mdx:84)

The file doesn't end with a newline character. Most linters and editors expect a trailing newline.

3. Minor: verify "Aster" token name (fees.mdx:33)

e.g. AVAX on Avalanche to Aster on Binance Smart Chain

Just double-checking — is "Aster" the intended token name here? If referring to the Astar Network token, the ticker is typically ASTR.

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Everything else looks good:

• Volume tier table is clean and easy to scan
• Fee category definitions are clear with helpful examples
• expandedPriceImpact field name fix (was expanded price impact) is correct
• New sponsored field and <Tip> callout for display mapping are useful additions
• New Fee Sponsorship section ties in well with the existing docs
• Follows the repo's documentation standards (active voice, heading hierarchy, callout usage)