Why IRIS

Fixed-rate borrowing is a basic credit product. Predictable funding cost is what lets a borrower plan around a loan rather than watch it. DeFi has built deep lending markets, but almost all of that infrastructure is variable-rate and optimized around pool utilization rather than certainty of cost. That mismatch is where IRIS starts.

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The bottleneck has been supply

Borrowers want fixed rates. The hard part has always been who takes the other side. A fixed-rate market is expensive to cold start. Before it can quote anything it needs long-duration risk-bearing capital, or a liquidity buffer large enough to service redemptions. That capital has to be there before the first borrower arrives. It is a liability-management problem. Someone has to absorb the gap between a borrower who wants certainty and a lender base that wants flexibility. Certainty does not appear on its own; it is carried by somebody. Every new fixed-rate market recreates the same tradeoff. Vault-based, peer-to-peer, AMM-mediated: the more certainty the borrower asks for, the more the supply side has to be compensated. The design changes, the two-sided tension does not. The common thread is that these architectures need risk capital to be pre-positioned, segmented and paid for before the market can scale at all.

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Fixed-rate borrowing does not need fixed-rate liquidity

DeFi’s variable-rate lending markets are the deepest productive capital onchain. Aave, Morpho, Spark and Fluid are liquid, battle-tested and still growing. So the premise of IRIS is that fixed-rate borrowing does not require fixed-rate liquidity to exist natively at every venue. If variable-rate liquidity already exists at scale, the missing piece is a mechanism that turns variable-rate exposure into fixed-rate borrowing without bootstrapping a new market from zero. That changes what limits the system. The ceiling becomes the liquidity across every venue IRIS integrates, rather than a pool IRIS had to fill first. Three roles fall out of it:

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Where the swap approach runs out of road

Fixing a rate on top of variable liquidity is not a new idea. Interest rate swaps and AMM-based fixed-rate markets are attempts at it, and they run into four recurring problems. Liquidity fragmentation. Every new lending market, whether a new Morpho pair or a Compound vault, requires its own swap pool with independently bootstrapped liquidity. Borrowers wait for that local liquidity to mature. Consensus pricing for heterogeneous risk. AMMs force a single consensus price onto every participant. A 30-day loan and a 180-day loan carry meaningfully different risk profiles, yet both are priced through the same construct. A single consensus price can be too coarse to underwrite a fixed rate on, and that produces adverse outcomes for the seller of the fixed rate and the buyer alike. Static capital. A swap market locks a borrower into the consensus rate of a specific venue at a specific moment. The borrower pays that venue’s own risk premium for the entire loan duration, cut off from cheaper capital elsewhere in the ecosystem. Hedges rather than loans. Swap protocols deliver an interest rate hedge that the user has to manage alongside a separate variable borrow position. Borrowers want a loan: deposit collateral, receive funds, repay a known amount. They chain together. Liquidity has to be pooled, pooling forces one price, one price forces a standard product, and a standard product ends up closer to a hedge than to a loan.

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Origination instead of a pool

IRIS moves fixed-rate lending from a pool model to an origination model. Rather than pooled liquidity collectively pricing rate risk, individual solvers compete to originate each loan on top of the venues you allowed. You sign an intent, solvers price it against their own models, and the best quote is settled onchain.

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Pricing each loan on its own

Fixed-rate loans differ from each other in ways that matter economically. A 30-day loan during low utilization is not the same underwriting problem as a 180-day loan during a liquidity crunch. A small loan on a stable venue is not the same as a large one that may need refinancing across markets. A solver evaluates your specific intent against its own models: how much rate volatility to expect over that horizon, what the size does to its hedging and to venue utilization, how volatile the target venue has been, and how your loan sits against the rest of its book. Several solvers can quote the same request, and the lowest valid rate wins. You get the number a solver was willing to sign, not a premium averaged across dissimilar demand.

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Capital that arrives with demand

A solver keeps capital in a bond pool, and part of it is locked when a loan settles. The same pool can back loans across different venues, assets and durations. That is the difference from a pre-positioned fixed-rate market. Capital is committed when a borrower actually shows up, not parked in an isolated market waiting for demand that may not come.

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Managing the funding, not locking it

A static swap ties the counterparty to one venue’s rate at one moment. If you take a loan backed by an Aave swap and Compound turns cheaper three days later, the swap cannot follow. A solver can. When it quotes a fixed rate, it is not promising to sit in one pool for the term. It is pricing its ability to fund your loan across every venue it is allowed to use. Moving between venues. If a solver starts your loan on Aave at 5% and Morpho later drops to 3%, it can repay the Aave debt and re-borrow the same amount on Morpho. Your fixed rate does not move. That spread is the solver’s, and that is the point. The chance to capture it is what the solver priced in when it quoted you. It is not a windfall taken after the fact. It was already in the number you accepted. Choosing when to lock in. Rather than buying an expensive long-dated hedge on day one, a solver can carry cheap short-term funding and change its approach as conditions move. Never being stuck with one venue’s quirks. A solver is not tied to one venue’s utilization spikes or governance parameters. It can follow funding across the venues you allowed, and it prices that freedom into the quote.

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What holds the promise up

None of this rests on solvers being generous. It rests on two things. Competition decides the rate. Several solvers see the same intent, and the one willing to sign the lowest rate wins it. That pushes each solver toward the rate where the loan is still worth its capital and its work. The bond enforces the rate. If the venue ends up costing more than the solver quoted, the difference comes out of the solver’s own capital rather than out of your loan. A solver that misprices rate risk pays for it. See What backs your fixed rate.