Fee-payer / sponsored announcement pattern

[truthixify]

Extra labels: feature
Tier: L (5-7 days) | Type: feature

Context. Recipients pay base fee for every announcement. Platforms (payroll, faucets, splitters) want to bundle many announces per Stellar op with a sponsor paying the fee via fee-bump. Signer's key still authenticates each entry.

Scope.

• New sponsored_announce(sponsor, entries) on stealth-sender.
• Sponsor pays base + per-op fee; per-entry payload retains signer authentication.
• Size cap (proposed 20 entries) with a dedicated error variant.
• Cost per entry recorded in PERF.md.

Acceptance.

• Optimized wasm still under 110 KB
• Integration test on futurenet verifies fee charged to sponsor
• Size cap enforced with a dedicated error type
• PERF.md shows per-entry cost, bindings regenerated + committed

Files. stealth-sender/src/lib.rs, integration-tests/sponsored.rs (new), PERF.md, bench/.

[Meet-hybrid]

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

Please can I work on this please?

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

[OlyraCreations]

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

Hi maintainer, could you please let me work on this one? I've reviewed the stealth-sender contract and the fee-bump flow — happy to implement sponsored_announce, add the 20-entry cap with a dedicated error variant, and cover it with a futurenet integration test plus updated PERF.md/bindings. Can start right away and hit the full Acceptance criteria within the L estimate.

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

[drips-wave]

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

🧑‍💻 @OlyraCreations: 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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