feat: sponsored fee-bump transactions for low-XLM wallets#66
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prodbycorne merged 1 commit intoJun 28, 2026
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- Add buildFeeBumpTransaction helper in src/lib/soroban.ts using the correct TransactionBuilder.buildFeeBumpTransaction(feeSource, baseFee, innerTx, networkPassphrase) positional API - Add fetchAccountBalances utility in src/lib/stellar.ts (404-safe) - Add POST /api/sign-fee-bump route handler that wraps and signs the inner transaction with STELLAR_FEE_SPONSOR_SECRET - Integrate automatic fee-bump detection into lockAssets and unlockAssets: fetches native XLM balance, enables sponsor mode when balance < 1.0 XLM and NEXT_PUBLIC_FEE_SPONSOR_PUBLIC_KEY is configured - Display sponsored warning banner in both deposit modals (farm list page and pool detail page) when fee-bump is active - Fix pre-existing duplicate isDisabled prop in UnlockModal - Fix pre-existing getEvents pagination type error in soroban.ts - 2 new unit tests for buildFeeBumpTransaction (all 66 tests pass) Closes SmartDropLabs#30
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Summary
Implements Issue #30 — sponsored fee-bump transaction support so users with < 1 XLM can still deposit into pools without paying transaction fees directly.
Changes
New Files
src/lib/stellar.ts—fetchAccountBalances(publicKey)query utility (404-safe for unfunded accounts)src/app/api/sign-fee-bump/route.ts—POST /api/sign-fee-bumpRoute Handler; wraps a user-signed inner tx in a sponsor fee-bump envelope signed withSTELLAR_FEE_SPONSOR_SECRETsrc/lib/soroban.feebump.test.ts— Unit tests for the fee-bump builder (2 tests)Modified Files
src/lib/soroban.tsbuildFeeBumpTransaction(innerTx, sponsorPublicKey, networkPassphrase)helper using the correct SDK positional API:TransactionBuilder.buildFeeBumpTransaction(feeSource, baseFee, innerTx, networkPassphrase)lockAssets— checks native XLM balance; if < 1.0 XLM andNEXT_PUBLIC_FEE_SPONSOR_PUBLIC_KEYis set, calls/api/sign-fee-bumpand submits the wrapped envelopeunlockAssets— same sponsored flowgetEventspaginationtype error (movedlimitto top level)src/app/farm/page.tsx— addsisFeeSponsoreddetection and warning banner in the deposit modalsrc/app/farm/[poolId]/PoolDetailClient.tsx— same sponsored banner in the pool detail deposit modalsrc/components/UnlockModal/UnlockModal.tsx— fixed pre-existing duplicateisDisabledpropEnvironment Variables Required
STELLAR_FEE_SPONSOR_SECRET.env.local)NEXT_PUBLIC_FEE_SPONSOR_PUBLIC_KEY.env.local)Testing
npm run test)npm run build)Closes #30