The stablecoin exposure nobody sizes

The trader who moves to stablecoins to 'go to cash' has not gone to cash - they have taken a position in an issuer's promise, and this lesson sizes the position the label hides.

What a stablecoin actually is

A stablecoin is a token an issuer promises to redeem for a currency, backed - to varying and sometimes opaque degrees - by reserves. The peg holds while the market believes the backing is real, liquid and redeemable; it breaks when that belief fails, and stablecoins have de-pegged, some temporarily and some to zero. So 'parked in stables' is a claim on the issuer's solvency and honesty - the counterparty risk of lesson 5, wearing the costume of cash - and the deepest crypto books quote against exactly these tokens (module 2), so the exposure is nearly unavoidable for an active trader.

The exposure nobody sizes

• It feels like the risk-free corner: moving to stables reads as reducing risk, so the position is not sized as a position - the exact error module 4 exists to prevent, in its most disguised form.
• The peg is the whole value: a stablecoin is worth its peg only while the peg holds - a de-peg is not a small loss but a break in the thing's defining property, and it happens fastest in the stress when the trader is most parked there.
• Issuer quality is the risk grade: transparent, audited, well-reserved stablecoins are lower-risk than opaque ones - the venue-integrity reading of module 2, applied to the token itself.

Sizing the safe corner

The honest treatment: stablecoin holdings are a position, sized as issuer counterparty exposure, capped like any counterparty, and diversified across issuers if large - the safe corner given the same discipline as the risky ones, because an unsized exposure is a risk whatever it is called. Genuine cash - fiat in a bank, off the crypto rails entirely - is the only true risk-free corner, and the difference between it and a stablecoin is the difference between money and a claim on an issuer's promise of money. Module 8 examines the mechanics; module 4's rule is simpler: nothing in crypto is unsized, least of all the thing that feels safest.