[Optimization] Dynamic Tier-Based Fee Structure

[Cedarich]

Label: optimization, finance
Complexity: 150 points
Description:
Replace the static fee_bps with a dynamic tier system. As the total volume handled by an escrow (or globally for a user) increases, the platform fee percentage should decrease.
Tasks:

• Define fee tiers (e.g., 0-1000 XLM: 50bps, 1000-5000 XLM: 30bps).
• Implement a calculate_tiered_fee helper function.
• Update fee resolution logic to use tiers.

[drips-wave]

This issue has been added to the Stellar Wave Program and is worth 150 Points.

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[BigBen-7]

@BigBen-7 has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

can i take this up?

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[drips-wave]

Congratulations, @BigBen-7! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

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