Implement Escrow Multi-Token Support with Conversion Rates

[famvilianity-eng]

Implement Escrow Multi-Token Support with Conversion Rates

Priority: High
Estimated Time: 3 hours

Description

Currently, escrow only holds one token per match. For platforms supporting multiple tokens, matches should allow stakes in different tokens (e.g., USDC and native XLM) with automatic price conversion.

Tasks

• Add conversion_rate: i128 field to allow token pair pricing
• Implement create_match_with_conversion(env, player1, player2, stake_amount, token_a, token_b, rate)
• Add Oracle call to verify conversion rate within ±5%
• Update payout logic to convert winner amount back to player's preferred token
• Add tests for multi-token matches and conversion verification

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Auto-created from UNSOLVED_ISSUES_40.md

[martinshub-tech]

@martinshub-tech has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I'd like to take this issue. I've analyzed the root cause and am confident I can deliver a reliable fix with proper testing.

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

[drips-wave]

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

🧑‍💻 @martinshub-tech: 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]

🦊 GrantFox — @martinshub-tech has been assigned to this issue!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #948)
2. Your PR will be reviewed by the StellarCheckMate maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@martinshub-tech's PR #1018 was approved and merged by @famvilianity-eng.

🏆 @martinshub-tech: You earned 40 FoxPoints for this contribution! Your current tier: Builder (1,231 total points). Track your full progress on GrantFox.

👏 Great work, @martinshub-tech! Keep contributing to StellarCheckMate.