Crypto glossary
Atomic settlement (T+0)
Atomic settlement means the asset and the payment of a trade transfer at the same instant in one transaction, or neither does, with no settlement delay.
In traditional markets, trading and settlement are separate steps. A share bought today in the US settles one business day later (T+1), and in Europe two days later (T+2), with clearing houses and custodians in between to manage the risk that one side fails to deliver. On a blockchain, if both the asset and the money exist as tokens on the same ledger, a single transaction can swap them atomically: it either completes in full or fails entirely.
This is how every swap on a decentralised exchange works, and it is a central argument for tokenising stocks, bonds and funds. Same-instant settlement removes counterparty risk between trade and delivery, frees capital tied up as margin and allows trading around the clock.
Atomicity requires the cash leg to be on-chain too, as stablecoins, tokenized deposits or wholesale CBDC, which is still the bottleneck for regulated assets. Instant settlement also removes the netting that lets brokers settle many trades with small net payments, so participants need funds ready in advance, and errors cannot be fixed during a settlement window.
Example
An investor buys a tokenised Treasury bond for 100,000 tokenised dollars; one smart contract call moves the bond to her wallet and the cash to the seller in the same block.