[CORE] Implement Real-Time Gas & Fee Delta Estimation Engine

[mijinummi]

Labels: core, high-difficulty, math, evm, soroban
Difficulty: High
Module: libs/gas-evaluator/

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🧠 Concept

Construct an execution model that calculates exact gas/fee differences ($\Delta \text{Gas}$) in USD and native gas tokens ($XLM, ETH$) based on identified optimization rules.

⚠️ Problem

Developers often ask: "How much money will fixing this actually save?" Providing precise estimated monetary savings makes audit reports actionable for team decision-makers.

📁 Implementation Scope

• libs/gas-evaluator/src/evm-opcode-calculator.ts
• libs/gas-evaluator/src/soroban-resource-calculator.ts
• libs/gas-evaluator/src/gas-delta-evaluator.ts

🛠️ Requirements

1. Map Solidity optimization rules to EVM opcode differential tables (e.g., SLOAD [100-2100 gas] vs MWRITE [3 gas]).
2. Map Soroban rules to Stellar CPU instruction and Ledger read/write byte resource cost schedules.
3. Fetch real-time token pricing ($ETH, XLM$) via cached pricing service to render estimated annual gas cost savings based on historical contract execution volume.

🎯 Acceptance Criteria

• Evaluates $\Delta \text{Gas}$ and outputs accurate cost reductions in USD and native token amounts.
• Supports current 2026 fee schedules for Stellar mainnet and EVM Layer 2 networks.
• Unit tests verify formula calculations against known manual gas benchmarks.

[mercy60]

@mercy60 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello maintainer. Can I work on this, I can delivery a PR within 24hrs

ℹ️ Repo Maintainers: To accept this application, review their application or assign @mercy60 to this issue.

[IamHarrie-Labs]

@IamHarrie-Labs has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hey Fren!

I'd love to take on this issue. I've reviewed the requirements and have a clear approach for the implementation. I can complete the changes, add the necessary tests, and ensure everything meets the acceptance criteria.

I estimate I can have a PR ready within about 2 hours of being assigned.
Kindly assign this to me. Thanks!

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[TheFaith-Code]

@TheFaith-Code has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi, I'd like to work on this issue

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[Vicky08100]

@Vicky08100 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hey maintainer, I would love to resolve this issue. Kindly assign me the issue. Thanks

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Vicky08100 to this issue.

[drips-wave]

Congratulations, @Vicky08100! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

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[drips-wave]

This issue has been completed by @Vicky08100 as part of the Stellar Wave Program's 7th Wave 🥳

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