Add protocol fee collection on every buy and sell trade execution

[Chucks1093]

Summary

Implement protocol fee deduction on every buy and sell transaction, routing the fee to the protocol revenue pool for distribution to stakers.

Scope

• Fee percentage configurable by admin in contract storage
• Fee deducted from trade amount before bonding curve calculation
• Fee transferred to protocol revenue pool address atomically
• FeeCollected event emitted with trade ID, amount, and fee
• Fee percentage capped at configurable maximum to protect traders

Acceptance Criteria

• Fee deducted correctly from every buy and sell transaction
• Fee routed to protocol revenue pool atomically with trade
• FeeCollected event emitted with correct fields
• Fee percentage update restricted to admin
• Cap enforced on fee percentage to prevent admin abuse

ETA

24 hours

[praizeD10]

@praizeD10 has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

Hi, I’d love to take on this issue! With my expertise in Rust, Stellar, and smart contract development, I can implement a clean and efficient solution.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @praizeD10 to this issue.

[DavisVT]

@DavisVT has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

i'm a developer well fit for implementing this task
Kindly assign them to me

ℹ️ Repo Maintainers: To accept this application, review their application or assign @DavisVT to this issue.

[Joseph-tech10]

@Joseph-tech10 has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

I’ve thoroughly reviewed the issue and have a clear understanding of the intended outcome. I’d like to take this on and deliver a well-integrated solution that meets the acceptance criteria while maintaining the quality and consistency of the existing project.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Joseph-tech10 to this issue.

[PEPPERITO23]

@PEPPERITO23 has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

I’d be glad to work on this project. I have a clear understanding of the requirements and can provide a solution designed to achieve the desired results efficiently and professionally.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @PEPPERITO23 to this issue.

[drips-wave]

Congratulations, @praizeD10! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on September 30, 2026.

🧑‍💻 @praizeD10: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@praizeD10's PR #1018 was approved and merged by @Chucks1093.

🏆 @praizeD10: You earned 40 FoxPoints for this contribution! Your current tier: Builder (1,489 total points). Track your full progress on GrantFox.

👏 Great work, @praizeD10! Keep contributing to accesslayerorg.