Welcome to a new era for on-chain trading.

Imagine sending someone an offer to buy their NFT or token, directly to their wallet, and having them accept it instantly, with no middlemen, no slippage, and no risk. No escrow contracts. No waiting. Just pure peer-to-peer exchange, powered natively by the network itself.

That’s now a reality on Radix, thanks to subintents, and the first live example is here: Atomix, a peer-to-peer trading platform built entirely on Radix.

Atomix gives a glimpse of what’s uniquely possible when the underlying blockchain architecture is designed for composability, safety, and user-first experiences from the ground up.

What Are Subintents For?

Subintents, sometimes called pre-authorizations, function as independent “mini-transactions” within the Radix ecosystem. Each one contains its own manifest, messages, and validity constraints. They can be pictured as modular Lego blocks of intent.

They solve a fundamental limitation of traditional blockchains, where transactions are monolithic and rigid. On Radix, subintents make it possible to pre-sign and pass around individual transaction components that others can later mix, match, and execute when specific conditions are met.

As Avaunt, builder of Shardspace, Notix, and Atomix, explains:

“Blockchain transactions today are terribly monolithic. Subintents are super flexible mini transaction Lego blocks — you can build, pre-sign, and pass around individual transaction components that others can mix, match, and execute when certain conditions have been met, enabling entirely new categories of applications that are impossible on other blockchains.”

Read more about subintents here.

Atomix: Subintents in Action

Atomix, recently launched on Mainnet, is the first live demonstration of how subintents unlock peer-to-peer trading on Radix.

Here’s how it works in practice:

• A buyer browses the seller’s wallet and sends a direct offer to purchase one of their assets.
  
  
• The buyer chooses a payment method from whitelisted assets like XRD, hUSDC, or others, and sets an offer expiration time, using subintent validity constraints.
  
  
• Optional custom messages can be included with the offer.
  
  
• If the seller uses Notix, they can instantly view, accept, or reject offers via the app, mobile push, or Telegram.
  
  
• The buyer signs the subintent. Within the offer’s validity window, the seller signs to complete the transfer. This happens instantly.

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The result? A 24/7 decentralized OTC desk, where any asset becomes tradeable directly between wallets. Perfect for:

• Acquiring specific NFTs from collectors
  
  
• Building positions in low-liquidity tokens without slippage
  
  
• Executing private trades without moving markets
  
  
• Securing time-sensitive deals
  
  
• Cross-asset swaps using whitelisted payment options
  

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Why This Is Only Possible on Radix

Subintents aren’t a smart contract hack or a complex off-ledger feature; they're native to Radix itself.

That means they’re secure by design, easy for users, and composable for developers. Users simply sign what they want to happen (“I’ll trade X for Y”), and Radix takes care of the rest: safely, atomically, and transparently.

This kind of trustless yet intuitive user experience has never been achievable on other blockchains.

The Bigger Picture

With Atomix now live on Mainnet, Web3 is witnessing the first example of a Radix-native trading experience that feels effortless, human, and instant. No smart contract gymnastics required.

But, this is just the start. Subintents are opening the door to a new wave of applications: decentralized OTC markets, trustless lending offers, conditional trades, coordinated DAOs. All possible because of how Radix was built from day one.