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SubsecondHave one built

About Subsecond

Twelve products, one foundation, one network.

Every product here exists because a payment on Arc is final in under a second, in dollars, for a fraction of a cent. Slower rails do not make these products worse; they make them impossible.

The idea

On 16 September 2026 Arc’s team published a Request for Builders: four frontiers where programmable money makes something buildable that was not buildable before, with grants and funding behind them. Subsecond answers it with twelve products, three on each frontier, and then does one thing an app store does not: hands the product over.

Whoever picks one owns the code, the deployment and the contract on Arc mainnet, and the contract pays its fees to their wallet. A product that is live, used and earning is what Arc’s programmes ask to see.

Read Arc’s request

The standard

  • Standalone, and its own. Every product is a production application with its own identity, its own README and its own deployment. They share code, never a look.

  • Real with nothing connected. What you see with no wallet is the product, running on seeded state that is clearly labelled as an example. It is how buyers and reviewers first see it.

  • It moves before the receipt. Every write updates the screen at once, because on Arc the receipt lands in under a second, and it rolls back with a reason on the rare occasion it does not.

  • Designed for the phone. Mobile is designed on its own where the desktop layout does not translate. Ninety or better on mobile Lighthouse, and a hundred on accessibility.

  • Motion that means something. Numbers roll because money moved; a pulse slows because a runway shrank; a line settles because a door closed.

What is real and what is an example

With nothing connected, each product runs on seeded state produced by the same logic that governs the real thing: the same rules, the same checks, the same arithmetic. That state is labelled an example wherever it appears.

Sign in and the product reads and writes Arc mainnet: real balances, real transfers, real refusals. Where a product needs something that is not funded yet, its page says so in plain words rather than pretending.

The network

Network
Arc, chain 5042
Final
On inclusion
A block every
0.48s
A payment costs about
$0.001
Fees are paid in
Dollars (USDC)

The twelve, in build order

  1. HeartbeatAI agents that pay for themselvesOpen
  2. CharterMoney that obeys the rules you writeOpen
  3. HeirFamily money that finds its way homeOpen
  4. CascadePay a whole crew the second you say yesOpen
  5. ContestManagers race for your savingsOpen
  6. BasketWages priced in months of livingOpen
  7. BookA till that borrows for itselfOpen
  8. UpfrontInsurance that pays before it checksOpen
  9. RoundA savings circle that runs itselfOpen
  10. SkimHourly cover for hourly workersOpen
  11. StreakCredit that grows with every on-time dayOpen
  12. BarangayA town with its own moneyOpen