[Security] Rate limiting per wallet address

[GoSTEAN]

Description

Rate limiting exists but may not differentiate by wallet address.

File: backend/src/middleware/rateLimit.middleware.ts

Acceptance Criteria

• Rate limit by wallet address (not just IP)
• Separate limits: auth (5/min), predictions (10/min), trades (30/min)
• Return Retry-After header

Priority

🟠 P1 — High

[drips-wave]

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[AfroTechBoss]

@AfroTechBoss has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Hello I'll also love to take this issue off your plates too

ETA : 24 hours

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[Haroldwonder]

@Haroldwonder has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

I would like to work on this

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Congratulations, @Haroldwonder! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on February 26, 2026.

🧑‍💻 @Haroldwonder: 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.

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