Blur launched Blend to bring perpetual lending to NFT collateral

Blur introduced Blend on May 1, 2023, extending the NFT marketplace into peer-to-peer lending against nonfungible collateral. A protocol paper published on the same date described loans without fixed expiries or price-oracle dependencies, with interest rates and loan-to-value terms determined through lender offers.

The development mattered because it placed a credit mechanism inside one of the principal venues competing for professional NFT traders. Blur was no longer facilitating only asset sales: Blend allowed an NFT owner to obtain ether without first selling the asset, while a lender could earn interest with the NFT securing the debt. That combination also introduced leverage, refinancing and liquidation risk directly into the marketplace’s product structure.

How Blend was designed

The May 1 paper was attributed to Dan Robinson, the pseudonymous researcher Transmissions11, and contributors identified as Galaga, Toad and Pacman. It said Blur Core Contributors had implemented the protocol.

Under the design, a lender signs an off-chain offer specifying terms such as the amount of ether available, the interest rate and the eligible NFT collection. A borrower accepts a compatible offer through an on-chain transaction, places the NFT in a vault subject to a lien and receives the principal. Each loan is matched individually rather than funded from a pooled market.

Loans have fixed rates by default but no scheduled expiry. “Perpetual” did not mean that a lender was committed indefinitely. A borrower could repay at any time, while a lender seeking to exit could initiate a refinancing auction. The auction attempted to find another lender willing to repay the outgoing lender and assume the position at a rising interest rate. If no replacement appeared before the protocol’s limit, the position could be liquidated and the existing lender could claim the collateral.

Blend therefore replaced an external price feed with a market test. A failed refinancing auction acted as the signal that the debt could no longer attract capital on the permitted terms. This avoided dependence on an oracle-derived NFT floor price, but it did not remove valuation risk. Thin demand, rapidly changing collection prices or a shortage of lenders could still determine whether a borrower retained the NFT.

Credit without an oracle still carried risk

The protocol paper presented oracle independence as an answer to the difficulty of measuring individual NFT values. Collection floor prices could be imperfect proxies for distinctive tokens, while on-chain prices could be manipulated or too sparse to support dependable liquidations.

The trade-off was that refinancing became central to risk management. A borrower’s position could continue while a lender remained willing to finance it, yet the position could move toward liquidation after the current lender called an auction. Market-set terms shifted judgment to individual lenders rather than eliminating it.

A ChainLight audit revised on April 28, 2023, provides a separate pre-launch technical record. It evaluated a specified Blend audit-branch commit and listed nine findings: two high-severity, one medium-severity, four low-severity and two informational. The report marked both high-severity findings and the medium-severity finding fixed. One low-severity issue was accepted without a fix, and one informational issue remained acknowledged. Those results document review and remediation decisions; they do not prove that the deployed system was free of defects.

What May 1 did not establish

Contemporaneous reporting independently confirmed Blur’s May 1 launch announcement and the core features described in the paper. The surviving record does not, however, establish adoption, sustained liquidity, borrower outcomes or the performance of the refinancing mechanism on that date. It also does not justify treating every form of collateral contemplated by the general design as supported in Blur’s initial interface.

The defensible May 1 conclusion was narrower: Blur had added an operational lending primitive to its NFT-market strategy, combining marketplace distribution with collateralized credit. Whether that structure would deepen liquidity or amplify leverage-driven losses remained an open question.