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What Is TVL?

TVL, total value locked, is the dollar value of assets deposited in a DeFi protocol: the money in the pools of a DEX, the collateral in a lender, the ETH in a staking protocol. It is DeFi's headline size metric, the closest thing the sector has to assets under management.

How It Actually Works

Dashboards sum the market value of everything parked in a protocol's contracts. Rising TVL means deposits arriving or prices of deposited assets rising. Falling TVL means withdrawals or falling prices. Comparing a protocol's TVL to its activity is a quick sanity check: a lender with billions locked and no borrowers is a parking lot, not a business.

What TVL Honestly Signals

Depositors' revealed trust: people do not park nine figures in contracts they believe will be hacked tomorrow. Institutional treasuries staking through a protocol push its TVL up and signal exactly that calculation.
Depth for users: more TVL in a DEX means less slippage; more in a lender means more available to borrow.

Risks and Common Mistakes

Double counting. An LST minted in one protocol and deposited into another counts twice across the ecosystem. Receipt-on-receipt stacks inflate sector totals.
Token price illusion. TVL denominated in a protocol's own volatile token can crash 50 percent with zero withdrawals.
Mercenary capital. TVL rented with incentive emissions leaves when the emissions stop. Sticky TVL and bribed TVL look identical on a chart.
Safety inference. High TVL did not save protocols that were exploited with nine figures inside. Size is not an audit.

When It Matters

Comparing protocols, judging whether yields have real capital behind them, and tracking sector health. DefiLlama, linked in my Resource Library, is the standard source and shows its methodology.