How it is calculated
Take every asset sitting in the protocol’s contracts, price each in dollars at current market rates, and add them up. Lending protocols count deposits, exchanges count liquidity in pools, staking protocols count staked tokens.
The word locked is loose. In most protocols the assets can be withdrawn at any time, and the figure describes what is deposited now rather than anything committed.
What TVL genuinely indicates
At a rough level, usage and trust. People deposit assets into contracts they expect to keep working, and a protocol holding billions has convinced a lot of holders of that.
It also indicates depth. A lending market with substantial deposits can absorb large borrowing without moving rates violently; a thin one cannot.
Those are real signals, and they are worth exactly as much as the caveats below allow.
Three ways it misleads
It moves with price without anything happening
TVL is denominated in the assets themselves. If a protocol holds a million tokens and the token price halves, TVL halves too, with identical deposits and identical activity. Charts showing a collapse in TVL frequently show nothing more than a market decline.
It double-counts across protocols
Deposit an asset in one protocol, receive a receipt token, deposit that token in a second protocol, and the same underlying value now counts in both. Aggregate figures across an ecosystem routinely include the same dollars several times over.
It can be bought
Protocols offering high rewards attract deposits from capital that arrives for the reward and leaves when it ends. TVL rises, then falls, and neither movement says much about whether the protocol is any good.
Why a merchant rarely needs this number
Direct relevance to payments is close to zero. Accepting crypto involves no protocol deposits, so TVL describes an activity that a payment flow does not touch.
Two indirect cases exist. If a merchant holds reserves in a yield-bearing product, TVL tells you something about the depth and popularity of what you are relying on. And if your payments route across chains through a bridge, its TVL is a rough proxy for how much value the bridge holds, which is worth knowing because bridges have historically been the most attacked infrastructure in the industry.
For an ordinary crypto payment gateway flow the number never comes up. Otherwise the term belongs to a different part of the ecosystem, and this entry exists mainly because people encounter it and reasonably want to know what it means.