Token

What Is a Token?

A token is a digital asset created and managed on an existing blockchain rather than running on its own native network. Unlike coins such as BTC (which powers the Bitcoin blockchain) or ETH (which powers Ethereum), tokens are built using smart contract standards deployed on top of a host chain. The most common standard is ERC-20 on Ethereum, though every major blockchain ecosystem has its own equivalent token standards — BEP-20 on BNB Smart Chain, SPL on Solana, and so on.

Tokens are the fundamental building blocks of the decentralized finance ecosystem. Virtually every DeFi interaction — lending, borrowing, trading, governance voting, providing liquidity — involves tokens in some form. Understanding what tokens are, how they work, and how they differ from one another is essential for navigating crypto markets.

Token vs. Coin: The Key Distinction

The difference between a token and a coin is technical but important. A coin is the native asset of its own blockchain. Bitcoin (BTC) is a coin because it operates on the Bitcoin network. Ether (ETH) is a coin because it is native to Ethereum. Coins are used to pay transaction fees and secure their networks.

A token, by contrast, exists as a smart contract on someone else's blockchain. USDC, LINK, UNI, and AAVE are all tokens — they live on Ethereum (and other chains) but do not have their own independent networks. Tokens rely on the host blockchain for transaction processing, security, and consensus. This distinction matters because a token's functionality and limitations are bounded by the capabilities of its host chain.

Types of Tokens

The token ecosystem has evolved into several distinct categories, each serving different purposes:

Utility tokens provide access to specific platform features or services. For example, a protocol might require users to hold its utility token to access premium features, reduce fees, or participate in certain markets.

Governance tokens grant holders voting rights over protocol decisions. Holders of AAVE tokens, for instance, can vote on proposals that modify Aave's lending parameters, risk settings, and treasury management. Governance tokens transform protocols from centrally controlled software into community-governed systems.

Stablecoins are tokens designed to maintain a stable value relative to a reference asset, typically the US dollar. USDC, USDT, and DAI are among the most widely used tokens in all of crypto, serving as the primary medium of exchange and unit of account in DeFi.

Wrapped tokens represent assets from other blockchains. Wrapped Bitcoin (WBTC), for example, is an ERC-20 token on Ethereum that is backed 1:1 by BTC held in custody. Wrapped tokens enable cross-chain interoperability, allowing assets like Bitcoin to participate in Ethereum-based DeFi.

Liquid staking tokens like stETH and cbETH represent staked crypto assets while remaining liquid and transferable. They have become a major collateral category in DeFi lending.

LP tokens (liquidity provider tokens) represent a depositor's share in a liquidity pool or lending market. When you supply assets to a DeFi protocol, you typically receive LP tokens that track your position and accumulated interest or fees.

Token Standards

Token standards define the rules and interfaces that tokens must implement to be compatible with wallets, exchanges, and other smart contracts. The ERC-20 standard on Ethereum specifies functions like transfer, approve, and balanceOf that all compliant tokens must support. This standardization is what makes DeFi composability possible — any protocol can integrate any ERC-20 token without custom code because the interface is consistent.

Newer standards have extended token functionality. ERC-4626 standardizes tokenized vaults, making it easier to build and compose yield-bearing positions. ERC-721 and ERC-1155 define non-fungible tokens (NFTs) and multi-token contracts, respectively.

Tokens in DeFi Lending

Lending protocols accept various tokens as collateral or borrowable assets, but not all tokens are treated equally. Each token's risk profile — determined by its liquidity, price volatility, market capitalization, and smart contract quality — influences how protocols set parameters like collateral factors and borrowing caps. A highly liquid, battle-tested token like WETH might have a collateral factor of 80%, while a newer, less liquid token might be capped at 50% or not accepted at all.

The tokenomics of each asset — its supply mechanics, emission schedule, and holder distribution — also matter for lending risk. A token with a concentrated holder base or upcoming large unlock events carries different risks than one with broad, stable distribution.

Evaluating Token Quality

Before interacting with any token in DeFi, consider several factors: Is the smart contract audited? Is the token widely supported across protocols and exchanges? What is its trading volume and liquidity depth? Does it have a transparent team and clear documentation? Is the contract upgradeable, and if so, who controls the upgrade mechanism? These questions help distinguish robust, trustworthy tokens from those that carry elevated risk.