Sponsored (fee-bump) transactions for gasless UX

[Miracle656]

Background

New users have zero XLM, so they can't pay fees. A sponsor account should cover fees + reserves so onboarding is truly gasless.

What to build

Add a fee-bump transaction path: the SDK builds the inner tx (passkey-signed), wraps it in a FeeBumpTransaction paid by a configured sponsor, and submits. Support sponsored reserves (begin/end sponsoring future reserves) for first deploy.

Key files

• sdk/src/useInvisibleWallet.ts
• frontend/wallet/lib/feeBump.ts (new)

Acceptance criteria

• Inner tx signed by passkey, outer fee-bump signed by sponsor
• Zero-balance account can deploy + transact
• Tests for fee-bump assembly and sponsor reserve unwind

Drips Wave · Complexity: Advanced · 200 points

[cyberdocs120]

@cyberdocs120 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I’d like to work on this issue because it contributes to improving the project's functionality, reliability, and overall user experience. I enjoy contributing to open-source projects and collaborating with maintainers to deliver clean, maintainable, and well-tested solutions.

I have experience working across frontend, backend, testing, API integration, debugging, and performance optimization tasks. I'm comfortable analyzing existing codebases, understanding requirements, implementing features or fixes, writing tests, and ensuring changes align with project standards and acceptance criteria.

My approach is to first understand the current implementation, identify the most maintainable solution, implement the required changes, add or update tests where necessary, and verify that everything works correctly before submitting a PR. I can communicate progress clearly and incorporate feedback quickly throughout the review process.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @cyberdocs120 to this issue.

[manueldezman]

@manueldezman has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi @Miracle656, Can I work on this?

I will implement the complete gasless onboarding path for Veil by constructing the fee-bump transaction wrapping engine and integrating it securely into your invisible wallet hook lifecycle.

Implementation Plan

1. Envelope Packaging: Create frontend/wallet/lib/feeBump.ts to wrap user-signed inner passkey transactions cleanly into Stellar FeeBumpTransaction structures.
2. Reserve Sponsorship: Integrate the explicit beginSponsoringFutureReserves and endSponsoringFutureReserves operation pairs to handle zero-balance contract or account creation flows.
3. SDK Hook Refactoring: Update sdk/src/useInvisibleWallet.ts to forward client transactions through the sponsored wrapper sequence before submission.
4. Validation Engineering: Write dedicated test modules verifying precise inner/outer signature isolation and correct operation sequencing for contract deployments.

Could you please assign this advanced architecture issue to me? I can deliver a clean, non-breaking SDK and frontend implementation immediately.

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

[benedictworks-home]

@benedictworks-home has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hello Maintainer, I would love to work on this issue.

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

[boalambo]

@boalambo has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I would love to fix the issue, kindly assign me. Thank you

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