Implement batch buy and sell operations for gas-efficient multi-key trading

[Chucks1093]

Summary

Add batch buy and sell functions to the platform contract allowing users to execute trades across multiple creator keys in a single transaction, reducing total gas cost.

Scope

• batch_buy(orders[{key_id, amount, max_slippage_bps}]) — executes all or reverts
• batch_sell(orders[{key_id, amount, min_slippage_bps}]) — executes all or reverts
• Per-order error returned if any single order fails (partial fill mode optional)
• Total fee and net cost returned in response
• BatchTradeExecuted event emitted with order count and total volume

Acceptance Criteria

• All orders execute atomically or entire batch reverts in strict mode
• Slippage protection applied per order within batch
• Per-order fee computed correctly in batch context
• BatchTradeExecuted event includes correct order count and volume
• Partial fill mode returns per-order success or failure flags

ETA

24 hours

[Wittig18]

@Wittig18 has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

hey maintainer, i would love to work on this

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Wittig18 to this issue.

[abubakarsadiqumar550-web]

@abubakarsadiqumar550-web has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

Hello Maintainer, I’d like to work on this issue. I’m ready to start now and deliver a clean PR within 1–2 hours if assigned.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @abubakarsadiqumar550-web to this issue.

[anifast-123]

@anifast-123 has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

Hello maintainer, i would like to work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @anifast-123 to this issue.

[nasirudeenbadirudeen87-cloud]

@nasirudeenbadirudeen87-cloud has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

Hi maintainer, I'd very much appreciate the opportunity to work on this issue.
Having reviewed the acceptance criteria, I'm confident that I'd be able to have a PR up shortly after being assigned.
Kindly assign this issue to me.
Thank you!

ℹ️ Repo Maintainers: To accept this application, review their application or assign @nasirudeenbadirudeen87-cloud to this issue.

[Eeboade]

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

Hi, kindly assign, i would love to fix

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

[dedukpe]

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

Please assign

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

[rajiabdulrahmon2020-ui]

@rajiabdulrahmon2020-ui has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

I’ve reviewed the issue from both the requirements and implementation perspective. I’d like to take ownership of it and deliver a solution that is robust, testable, and appropriately scoped to the problem.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @rajiabdulrahmon2020-ui to this issue.

[Sam-Rytech]

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

Hi maintainer

I'd like to work on this issue

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

[mysterio123865]

@mysterio123865 has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

Pls kindly assign

ℹ️ Repo Maintainers: To accept this application, review their application or assign @mysterio123865 to this issue.

[somotochukwu-dev]

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

Hi
Please assign this issue to me
Thanks

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

[drips-wave]

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

🧑‍💻 @dedukpe: 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 🌊