Are stablecoins halal?

It depends. Many scholars say holding or spending a fully backed stablecoin like USDC is permissible, much like holding digital dollars. The problems start with what you do with it: earning "yield" by lending it out is usually interest, and swaps must follow the rules for exchanging money.
What a stablecoin is
A stablecoin is a crypto token designed to stay at a fixed value, usually 1 US dollar. Fiat-backed coins like USDC and USDT say each token is backed by cash and short-term government bonds. Others are backed by crypto collateral or, in the case of "algorithmic" coins, by code alone. Scholars look at these types differently. For crypto in general, see Is crypto halal?
Holding and spending: mostly fine
Using a backed stablecoin to send money abroad, pay a freelancer or park funds briefly is treated by many contemporary scholars like using a digital currency. It is a medium of exchange with stable value, which is the opposite of a speculative bet. Islam's basic rule for money is fairness and consent:
Some scholars are more cautious because the issuer earns interest on the bonds behind the coin. Most see that as the issuer's business rather than the holder's, since you receive no interest yourself, but a minority advise avoiding it where a cleaner option exists.
Where it becomes haram
- Lending for yield. Depositing stablecoins into a lending protocol or exchange "earn" product that pays 5% for lending them out is a loan with a set return. That is riba. See What is riba in Islam?
- Unequal or delayed swaps. The Prophet ﷺ said gold for gold, silver for silver, like for like and hand to hand (Sahih Muslim 1587). Scholars apply this to currencies: swapping USDC for dollars or another stablecoin should be at the going rate and settled immediately, which most on-chain swaps are.
- Leverage and margin. Borrowing stablecoins with interest to trade with leverage brings in both riba and heavy speculation.
- Algorithmic coins with no real backing carry high uncertainty (gharar), and several have collapsed. Many scholars advise staying away.
Staking and rewards
Stablecoins don't secure a blockchain, so "staking" them is almost always lending in disguise. Check how any reward is generated before accepting it. See Is crypto staking halal?
- Holding and spending backed stablecoins is allowed by many scholars.
- Yield from lending them out is riba.
- Currency swaps should be at market rate and immediate.
- Avoid algorithmic coins and leveraged trading.
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