Stablecoins as dry powder: does it hold up?

The dry powder idea is one of the more intuitive onchain narratives. Stablecoins are dollars that already live on chain. If their total supply is growing, the reasoning goes, there is more money sitting on the sidelines ready to buy crypto. Shrinking supply means money is leaving the system. As a rough measure of available buying power it holds up better than most narratives, but it is slower and blunter than people assume.

What it gets right

Over longer stretches, stablecoin supply does track the tide of capital coming into and out of crypto. Big expansions have tended to precede or accompany strong markets, because you cannot have a sustained rally without fuel, and stablecoins are a large part of the fuel. It is a genuine measure of liquidity, and liquidity is the thing that actually moves markets.

What it gets wrong

Supply moves slowly. Mints and redemptions happen in chunks and can lag the market by weeks. The metric also cannot tell you intent. Freshly minted stablecoins might be destined to buy, or they might sit idle, or they might be there to farm yield with no intention of touching spot crypto. So a rising number raises the ceiling on what is possible without guaranteeing anything happens.

My read

I treat stablecoins as a slow moving permission slip. When supply is expanding, I am more willing to believe a bullish onchain picture, because the fuel is there. When it is contracting while price is trying to rally, I get suspicious, because rallies without liquidity behind them tend to be the ones that fail. As with everything in the tool, it is measured against its own recent normal, so I am reacting to a real change in the trend, not to the fact that the number is simply large.