DeFi

Coupon Rate

Annual interest rate paid by a bond issuer as percentage of face value. A 5% coupon on $1,000 bond pays $50/year. In tokenized bonds, coupon payments are automated as on-chain distributions. T-bills are zero-coupon (purchased at discount, redeemed at par).

IDcoupon-rate

Plain meaning

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Annual interest rate paid by a bond issuer as percentage of face value. A 5% coupon on $1,000 bond pays $50/year. In tokenized bonds, coupon payments are automated as on-chain distributions. T-bills are zero-coupon (purchased at discount, redeemed at par).

Mental model

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Think of it as a market mechanic used to price, route, or move capital through liquidity apps.

Technical context

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AMMs, routing, liquidity, lending, and trading infrastructure.

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Coupon Rate (coupon-rate)
Category: DeFi
Definition: Annual interest rate paid by a bond issuer as percentage of face value. A 5% coupon on $1,000 bond pays $50/year. In tokenized bonds, coupon payments are automated as on-chain distributions. T-bills are zero-coupon (purchased at discount, redeemed at par).
Related: Fixed Income, T-Bill (US Treasury Bill), Basis Points
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Branch

Fixed Income

Asset class comprising debt instruments paying regular, predetermined interest and returning principal at maturity. Includes government bonds, corporate bonds, T-bills, and money market instruments. Solana's RWA ecosystem is primarily fixed-income-focused.

Branch

T-Bill (US Treasury Bill)

Short-term US government debt (4-52 week maturity) sold at discount, redeemed at par. Considered safest short-term investment. Most popular RWA category on-chain — Ondo's USDY and BlackRock's BUIDL hold T-bills.

Branch

Basis Points

Unit of measurement equal to 0.01% (one hundredth of a percentage point). 100 bps = 1%. Used across DeFi for swap fees, protocol fees, and yield spreads. Token-2022's transfer fee extension configures fees in basis points.

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DeFi

Fixed Income

Asset class comprising debt instruments paying regular, predetermined interest and returning principal at maturity. Includes government bonds, corporate bonds, T-bills, and money market instruments. Solana's RWA ecosystem is primarily fixed-income-focused.

DeFi

T-Bill (US Treasury Bill)

Short-term US government debt (4-52 week maturity) sold at discount, redeemed at par. Considered safest short-term investment. Most popular RWA category on-chain — Ondo's USDY and BlackRock's BUIDL hold T-bills.

DeFi

Basis Points

Unit of measurement equal to 0.01% (one hundredth of a percentage point). 100 bps = 1%. Used across DeFi for swap fees, protocol fees, and yield spreads. Token-2022's transfer fee extension configures fees in basis points.

DeFi

CPMM (Constant Product Market Maker)

The simplest and most widely used AMM model, based on the formula x * y = k where x and y are token reserves and k is an invariant. Every swap changes the ratio of reserves while keeping the product constant, producing a hyperbolic price curve. CPMMs provide liquidity across the full price range (0 to infinity) but are less capital-efficient than concentrated liquidity designs. Raydium's standard pools use this model.

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DeFicredit-rating

Credit Rating

Assessment of creditworthiness by agencies (Moody's, S&P, Fitch). Ranges from AAA (near risk-free) to junk (BB+ and below). US Treasuries are AAA-rated. Private credit DeFi protocols must evaluate risk without formal ratings, a key risk factor.

DeFifunding-rate

Funding Rate

A periodic payment exchanged between holders of long and short perpetual contract positions to keep the perp price anchored to the spot price. When the perp trades above spot (positive funding), longs pay shorts; when below spot (negative funding), shorts pay longs. Funding is typically settled every hour on Solana perps platforms like Drift and Jupiter Perps. High funding rates create arbitrage opportunities.

DeFiinterest-rate-model

Interest Rate Model

The algorithm a lending protocol uses to determine borrow and supply interest rates based on pool utilization. Most Solana lending protocols use a kinked (piecewise linear) model with a gentle slope below optimal utilization and a steep slope above it, creating urgency to repay when liquidity becomes scarce. Parameters include base rate, optimal utilization point, and slope values for each segment.

Related terms

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DeFifixed-income

Fixed Income

Asset class comprising debt instruments paying regular, predetermined interest and returning principal at maturity. Includes government bonds, corporate bonds, T-bills, and money market instruments. Solana's RWA ecosystem is primarily fixed-income-focused.

DeFit-bill

T-Bill (US Treasury Bill)

Short-term US government debt (4-52 week maturity) sold at discount, redeemed at par. Considered safest short-term investment. Most popular RWA category on-chain — Ondo's USDY and BlackRock's BUIDL hold T-bills.

DeFibasis-points

Basis Points

Unit of measurement equal to 0.01% (one hundredth of a percentage point). 100 bps = 1%. Used across DeFi for swap fees, protocol fees, and yield spreads. Token-2022's transfer fee extension configures fees in basis points.

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DeFi

AMM (Automated Market Maker)

A protocol that enables token swaps using algorithmic pricing against pooled liquidity instead of matching individual buyers and sellers. AMMs use mathematical formulas (typically constant product x*y=k) to determine prices based on the ratio of tokens in a liquidity pool. On Solana, major AMMs include Raydium, Orca, and Meteora.

DeFi

CLMM (Concentrated Liquidity Market Maker)

An AMM design where liquidity providers concentrate their capital within specific price ranges instead of across the full 0-to-infinity range. CLMMs dramatically improve capital efficiency—LPs earn more fees per dollar deposited within their active range. If the price moves outside the range, the position becomes inactive. Orca Whirlpools and Raydium CLMM are leading implementations on Solana.

DeFi

Liquidity Pool

A smart-contract-held reserve of two or more tokens that enables trading via an AMM. Users deposit token pairs in specified ratios to become liquidity providers and earn trading fees. Pools are identified by their token pair and fee tier. Pool depth (total value locked) determines price impact for trades.

DeFi

LP Token

A token issued to liquidity providers representing their proportional share of a pool's reserves and accrued fees. LP tokens can be burned to withdraw the underlying assets. The value of LP tokens changes as the pool's token ratios shift and fees accumulate. LP tokens are often stakeable in yield farming programs for additional rewards.