Instrument classes / not rankings

Know what pays.

Every yield has a payer, a mechanism, and a condition. This field guide separates four broad classes by where the return comes from, what must stay true, and what can interrupt it.

How to read / 01

A class describes a mechanism. It does not select a product.

Labels can conceal important differences in issuer, custody, liquidity, duration, fees, tax treatment, and legal claim. Use these categories to form better questions—not to infer that two instruments with similar labels carry equivalent risk.

Four ways a rate can be produced.

No live rates appear here. A quoted return should always be read alongside its source date, compounding convention, duration, costs, and failure conditions.

01 / CASH & T-BILL STYLE

Payment for short-term funding.

Typically short-duration claims or deposits linked to prevailing short-term interest rates.

Where yield comes from

An issuer or financial institution pays for temporary use of capital. In sovereign bills, the return is generally the difference between purchase price and value paid at maturity.

What must stay true

The issuer must meet its obligation, the custody chain must function, and capital must remain available on the expected date. Reinvestment assumptions matter after maturity.

What usually breaks it

Rate changes reduce future reinvestment income. Early sale can introduce price movement. Inflation, tax, fees, access limits, and institutional failure can reduce the usable result.

02 / MONEY-MARKET STYLE

A managed pool of short claims.

Liquidity-focused structures holding deposits, bills, repo, or short-term debt.

Where yield comes from

Income from a rotating portfolio of short-maturity instruments, less management and operating costs. The displayed rate commonly changes as the portfolio resets.

What must stay true

Holdings must remain liquid and collectible, valuation must remain orderly, and redemption terms must continue to work under the governing rules.

What usually breaks it

Falling short-term rates compress income. Credit events, stressed redemptions, liquidity gates, valuation disruption, and fees can make cash-like behavior less cash-like.

03 / CREDIT

Compensation for borrower risk.

Claims on companies, consumers, projects, or other non-sovereign borrowers.

Where yield comes from

A borrower pays interest and, sometimes, an additional spread over a reference rate. That spread compensates for default risk, illiquidity, complexity, and capital structure.

What must stay true

The borrower must generate enough cash to pay, collateral and covenants must retain meaning, and the investor’s legal priority must perform as described.

What usually breaks it

Defaults, downgrades, refinancing trouble, weak recovery value, subordination, concentration, long duration, or an inability to sell without a substantial discount.

04 / VARIABLE ON-CHAIN

Programmatic, variable cash flow.

A broad category—not a product recommendation or a substitute for diligence.

Smart-contract + counterparty risk

Where yield comes from

Possible sources include borrower interest, transaction fees, market-making activity, validator rewards, or token emissions. These sources are economically different and should not be combined into one unexplained APY.

What must stay true

Code, governance, oracles, collateral, counterparties, custody, underlying assets, and network operation must all behave within assumptions. Liquidity must exist when an exit is needed.

What usually breaks it

Exploits, depegs, liquidation cascades, oracle faults, admin-key abuse, bridge failure, insolvency, adverse governance, emission collapse, congestion, and impermanent loss.

The first question changes by class.

This is a diligence orientation, not a claim that any class is safe or suitable.

Class	First question	Rate behavior	Principal concern
Cash & T-bill style	Who owes the payment, and when?	Fixed to maturity or resets on renewal	Issuer, custody, inflation, reinvestment
Money-market style	What does the pool actually hold?	Variable as short rates and holdings change	Liquidity, credit quality, redemption terms
Credit	Why does the borrower pay a spread?	Fixed or floating; price can move before maturity	Default, recovery, seniority, duration
Variable on-chain	Which economic activity produces each part of the return?	Often variable and highly path-dependent	Code, counterparties, collateral, liquidity

Tax and legal treatment vary by jurisdiction and structure and are outside this summary.

Now subtract the drag.

Test a stated assumption against amount, horizon, and fees. The calculator uses no live market data and produces illustrations, not forecasts.

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