What is Blend? DeFi Protocol Guide

Blend is a decentralized, non-custodial protocol for lending and borrowing constructed on the Stellar network using the Soroban smart contract environment. It serves as a base financial primitive that lets users, builders, and other protocols launch permissionless, isolated lending markets for any asset native to Stellar.

The design intentionally avoids dependence on centralized governance or multisignature control, prioritizing straightforward, decentralized infrastructure. At the time of a major exploit in February 2026, it was considered the largest lending marketplace on Stellar.

The development team Script3 has deployed applications atop Blend, including YieldBlox.

Overview

Blend differentiates itself from pooled lending models by using per-market isolation instead of a single, shared liquidity pool. Each lending market is implemented as a distinct collection of smart contracts so that issues in one market — whether a bug, liquidity strain, or problematic debt — do not affect other markets on the platform.

This permissionless model allows anyone to create a new lending market and specify its individual settings, such as which collateral is accepted, which price oracles are used, and the risk parameters that govern lending and borrowing.

The project’s timeline includes rapid expansion as well as two significant security incidents that exploited oracle pricing in newly created, low-liquidity markets, underscoring vulnerabilities linked to flexible, permissionless pool creation.

A statement posted on the project's official X (formerly Twitter) profile on October 14, 2025, encapsulates this view:

Lending markets don’t need multisigs, governance forums, or brand decks. They need to work. Blend: permissionless, isolated lending pools. Built on Soroban.

Technology and Features

Blend’s system is implemented on Stellar and leverages Soroban smart contracts to provide the functional components required for decentralized lending and borrowing.

Permissionless and Isolated Pools

A primary capability of the protocol is unrestricted pool creation: unlike systems that restrict assets to a whitelist, Blend permits any participant to launch an independent lending pool for any Stellar-based token.

Every pool is isolated with its own set of risk controls and supported assets, a structure intended to confine losses so that a compromise or accumulation of bad debt in one pool does not endanger other pools.

Core Mechanics

• Lending: Participants can deposit assets into a Blend pool to supply liquidity. They receive interest-bearing tokens in exchange and earn yield derived from the interest payments made by borrowers.
• Borrowing: Users lock approved collateral to borrow other assets from a pool. The available borrow amount is governed by the collateral’s value and the pool’s configured Loan-to-Value (LTV) ratio.
• Backstopping: The protocol supports a backstopping arrangement where users, called backstoppers, stake assets to act as a reserve for a specific pool. If a pool experiences a deficit due to events like failed liquidations, these backstop stakes are used to cover losses and restore lender balances. Backstoppers are rewarded with a share of protocol revenue for providing this safety buffer.
• Auctions: When a position falls below its collateral requirements, the protocol initiates an auction to liquidate the borrower’s collateral. The collateral is sold on the open market to repay the outstanding debt and help preserve the lending pool’s solvency.

History and Development

The project’s official X account went live in November 2024. On December 18, 2024, Blend announced mainnet support for Ledger hardware wallets, a feature developed in partnership with CreitTech to improve user security.

In February 2025 the team began promoting a significant upcoming upgrade, which was formally revealed as "V2" in a video released on April 17, 2025. The V2 release was billed as bringing more advanced capabilities and a sturdier architecture.

Security Incidents

Blend has been the target of two major exploits, both resulting from manipulation of price oracles in isolated, permissionless pools.

August 2025 Exploit

Around August 12, 2025, an attack against Blend caused losses estimated at roughly $10 million. The exploit hinged on a price feed that sourced values from a low-liquidity pool on a Stellar-based decentralized exchange.

The attacker used a flash loan to obtain a large amount of an illiquid token and then artificially pushed its price on the DEX. Blend’s oracle ingested the distorted price as the asset’s true value, allowing the attacker to post the low-value token as collateral at the inflated price and withdraw more valuable assets such as XLM and USDC, draining the targeted pool.

Although the incident emptied the affected pool, Blend’s isolated risk architecture prevented the failure from spreading to other markets.

BLND Token

Blend issues a native utility token called BLND. Based on protocol documentation mentioning emissions, the token's primary functions likely include liquidity incentives for lenders and borrowers, governance rights for voting on protocol changes, and staking within features like the backstopping mechanism.