Add a bonding curve simulation view function that returns the buy and sell price for any supply and quantity without state mutation

[Chucks1093]

Summary

The client needs to show price previews for various quantities without triggering a transaction. A simulate_buy and simulate_sell view function that accepts a supply level and quantity and returns the computed price without mutating any state would power client-side price previews and the batch buy total cost estimate.

Scope

• Add simulate_buy(key_id: BytesN<32>, quantity: u32) as a read-only view function
• Add simulate_sell(key_id: BytesN<32>, quantity: u32) as a read-only view function
• Both functions should read the current supply from storage and compute the price using the bonding curve formula
• Return the total cost and per-unit price without writing to any storage entry
• These functions must work during the auction phase, returning the auction price when applicable

Acceptance Criteria

• simulate_buy returns correct total cost and per-unit price
• simulate_sell returns correct total proceeds and per-unit price
• Neither function mutates any storage entry
• Auction-phase price returned correctly during auction
• 404-equivalent panic with KeyNotFound for unknown key IDs

ETA: 24 hours

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Coordinate on Telegram

[Abdulrasaq1515]

@Abdulrasaq1515 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

hello maintainer , i can fix this issue

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[adelekevictor12]

@adelekevictor12 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello maintainer, i can fix this issue

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[sojetunde8]

@sojetunde8 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I can work on this.

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[xsthar]

@xsthar has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

hi maintainer, please assign

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[somotochukwu-dev]

@somotochukwu-dev has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi
Please assign this issue to me
Thanks

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[drips-wave]

Congratulations, @sojetunde8! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@sojetunde8's PR #843 was approved and merged by @Chucks1093.

🏆 @sojetunde8: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (971 total points). Track your full progress on GrantFox.

👏 Great work, @sojetunde8! Keep contributing to accesslayerorg.