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By Lendoor
Lendoor is uncollateralized, on-chain credit: the borrow -> repay -> score lifecycle runs on Soroban, settling in USDC. It is live end-to-end on Stellar testnet, and the same protocol runs at scale on Celo mainnet with real loans; this build brings it to Stellar mainnet.
What we're shipping (each with how it uses Stellar + the impact):
Cross-chain USDC liquidity via Circle CCTP. Bring USDC liquidity from Celo, where Lendoor already operates with real loans, into the Stellar vault. Impact: a direct funnel of external USDC liquidity into a Stellar-native credit protocol, open to external LPs.
Frictionless onboarding via Privy. Email / social / passkey sign-in provisions a Stellar wallet automatically (trustlines handled), and transactions are gas-sponsored, so users never need to hold XLM. Impact: removes the seed-phrase and gas barriers to onboard onto Stellar.
Capital efficiency via DeFindex. Idle vault USDC is routed into DeFindex in tranches and pulled back on borrow demand, so it is never sitting unproductive. Impact: keeps protocol liquidity productive and drives TVL to Soroban. (Treasury-level, not a retail yield product.)
Uncollateralized credit + on-chain score. Borrow / repay on our Soroban Vault (USDC settlement); the Loan Manager stores a per-wallet limit and score that grows with on-time repayment. Stellar's sub-cent fees + ~5s settlement make small-ticket loans viable. Impact: economical micro-credit, plus a portable on-chain credit record any Stellar app can read.
Compliance: identity verification (KYC) is gated (off-chain) before a wallet can borrow on mainnet.
$85.0K
Lendoor is not a prototype. The EVM/Celo deployment has real, verifiable on-chain traction:
In production on Celo (EVM) inside Lemon Cash, one of LatAm's largest crypto wallets: 4,576 uncollateralized loans to 1,174 borrowers, ~$38K originated, all verifiable on-chain and on our public Dune dashboard: https://dune.com/lucholeonel/lendoor-traction-celo
Repayment matures cohort over cohort, from 65% (Dec) to ~90% (May, matured cohorts). 50% repeat-borrow rate; 296 power users (5+ loans) repay above book average; AI voice collections agent live in production.
Two consecutive months of positive net yield on the book (April and May 2026).
Selected into Pygma (a fintech accelerator for Latin founders, bridging LatAm and the US).
On Stellar: full borrow -> repay -> score lifecycle live end-to-end on testnet (app: https://stellar.lendoor.xyz/borrow), verifiable on Stellar.Expert: Vault CDEJOQBQEZ7LUXSWXM4RF6EPBZLMJHMTGKC5GNWK5TNJR36TBHQLCULP, Loan Manager CDIHUCP6DWKW7B6IUECP3SCK5WCI3W5ITNQDZEK2TNI55WLXDM6Y4WJJ.
2nd place at the PULSO Hackathon (NearX x Stellar Development Foundation, Argentina track), where we won an Instaward.
Tranche #0 (10%, $8,500): initial funding to set up the dev environment and scaffold the CCTP integration.
Deliverable 1.1 (Integration, CCTP): CCTP integration live on testnet.
Brief: Integrate Circle CCTP to bridge USDC from Celo into the Lendoor vault on testnet, with attestation handling and retry/reconciliation.
Measure of completion: a testnet transaction bridging USDC via CCTP into the vault, plus the PR in the public repo.
Budget: USD 7,000.
Deliverable 1.2 (Integration, Privy): Privy wallet onboarding live on testnet.
Brief: Integrate Privy so a user signs in (email / social / passkey), gets a Stellar wallet provisioned, and signs a Soroban transaction.
Measure of completion: a recorded testnet run of a user onboarding via Privy and signing a Soroban tx, plus the PR.
Budget: USD 6,000.
Deliverable 1.3 (Support): KYC / identity-verification gate (off-chain compliance).
Brief: Add an off-chain KYC / identity-verification gate so a wallet must complete verification before it can borrow. This is off-chain compliance tooling, not a Stellar building-block integration.
Measure of completion: a testnet run where borrow is blocked until KYC is completed.
Budget: USD 4,000.
Deliverable 2.1 (Integration, Privy): Privy wired end-to-end into the credit flow on testnet.
Brief: Wire Privy wallet + session signing into the full borrow -> repay -> score lifecycle end-to-end on testnet.
Measure of completion: an end-to-end testnet run (onboard via Privy -> borrow -> repay -> score update).
Budget: USD 4,000.
Deliverable 2.2 (Integration, DeFindex): DeFindex idle-buffer capital efficiency on testnet (yield accrues to protocol treasury, not a retail product).
Brief: Integrate DeFindex as a capital-efficiency layer: the vault keeps only a small idle buffer and routes excess idle USDC into DeFindex in fixed tranches (e.g. $1,000 at a time), withdrawing in tranches on borrow demand so idle capital never exceeds the buffer. Yield accrues to the protocol; it is not offered as a retail product.
Measure of completion: an end-to-end testnet run: idle USDC deposited into DeFindex, yield accrual visible, funds pulled back to serve a borrow.
Budget: USD 12,000.
Deliverable 2.3 (Support): Production hardening of the contracts for fund custody.
Brief: Multisig + timelock on admin/upgrade, an emergency pause + least-privilege roles, a real decimals-offset + enforced seed deposit, and checked/mul_div math.
Measure of completion: upgrades gated by multisig + timelock; pause blocks borrow/deposit; roles and math covered by tests.
Budget: USD 8,000.
Deliverable 2.4 (Support): Threat model + on-chain monitoring plan + adversarial tests.
Brief: Produce a STRIDE threat model (including the DeFindex composability surface) and an on-chain monitoring plan, and expand the happy-path tests to adversarial/security scenarios.
Measure of completion: threat model + monitoring plan docs, and the adversarial test suite passing.
Budget: USD 1,500.
Deliverable 3.1 (Integration, DeFindex): DeFindex finalize + mainnet config.
Brief: Finalize the utilization-aware routing (deploy idle to yield, pull back on borrow demand) and configure it for mainnet.
Measure of completion: on mainnet, idle vault USDC earning yield via DeFindex and correctly pulled back to serve borrows.
Budget: USD 5,000.
Deliverable 3.2 (Integration, CCTP + Privy): Mainnet cutover.
Brief: Deploy CCTP + Privy live on Stellar mainnet with operator/risk configuration; open the credit vault to crypto-native users with CCTP-funded liquidity and Privy onboarding.
Measure of completion: live mainnet contract IDs on a Stellar explorer, plus a user onboarding via Privy and completing borrow -> repay on mainnet.
Budget: USD 7,000.
Deliverable 3.3 (Support): Final hardening + reliability.
Brief: Final reliability pass for mainnet: retry/idempotency, failure recovery, and any fixes needed before launch.
Measure of completion: reliability measures in place and covered by tests.
Budget: USD 6,000.
Deliverable 3.4 (Support): Production Soroban indexer + on-chain monitoring.
Brief: No off-the-shelf indexer covers our reconciliation and score-sync needs. Build a production service: event ingestion via Soroban RPC (getEvents) with durable cursor + backfill + retention-window handling, DB reconciliation, loan/score/limit sync, dedup, on-time/late classification, and on-chain monitoring/alerting for the mainnet deployment. (Off-chain, proprietary.)
Measure of completion: indexer running against mainnet, the app reflecting on-chain state accurately, monitoring/alerting live, test suite passing.
Budget: USD 7,000.
Deliverable 3.5 (Support): Validation user testing + committed on-chain metric.
Brief: Run validation-focused user testing with real users (user testing <= USD 4,000, within the 1/3 cap) and hit the committed on-chain usage metric.
Measure of completion: >= 100 loans originated (unique disbursement events of the mainnet Loan Manager contract) to KYC-verified borrowers on Stellar mainnet, measured over a 4-week window from the mainnet cutover (D3.2), verifiable on-chain via the deployed Loan Manager contract ID on Stellar.Expert plus a public query, plus a user-testing report.
Budget: USD 9,000.
A two-person technical founding team, shipping together since 2024 (20+ hackathons, 11 prize placements). Luciano Carreño (CEO) is a lawyer turned full-stack engineer: he leads product, partnerships and the regulatory edge that is half the business in LatAm credit, where fintech rules vary country by country. Fabian Diaz Viera (CTO) is a blockchain + ML engineer who has shipped production smart contracts across EVM and Solana; he owns the risk model and the Soroban/EVM contracts. We built and operate the whole stack ourselves, including the Soroban contracts (Vault + Loan Manager), on top of the live Celo deployment with real loans on mainnet. Luciano Carreño: LinkedIn https://www.linkedin.com/in/lucianoleonelcarreno/ , GitHub https://github.com/LuchoLeonel. Fabian Diaz Viera: LinkedIn https://www.linkedin.com/in/fabian-edwin-diaz-425a69227/ , GitHub https://github.com/fabian416.
Fabian Edwin Diaz Viera
Luciano Carreño
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