Get paid for what you build.

Wallet sign-in, monthly or yearly memberships, lifetime purchases and credit packs in USDC. Your users pay from a phone wallet by QR code or from a browser wallet, and the money lands in your wallet in the same transaction.

Get started Docs

Test USDC is free from faucet.circle.com.

For your coding agent

Add sub3 to this app for my product acme/app, following https://sandbox.sub3.dev/llms.txt.

Use your own product instead of acme/app; the dashboard shows this sentence for each of yours.

1

Register your handle, then create a product

Claim @acme ($20 once) from your wallet, then create acme/app with tiers, lifetime items and credit packs. Both live on Arc, owned by your wallet.

2

Add sign-in and checkout

Give your agent the sentence above, or follow the guide. Your app opens sub3's hosted pages and asks one API what each user may use. Any language, any framework.

3

Get paid

Users scan a QR code with a phone wallet, or pay from a browser wallet. The payment is split on chain, and your share is in your wallet in the same transaction.

Two ways in

For developers The step-by-step guide Sign-in, checkout buttons, access checks, credit packs and going live, with code from tested examples. /docs → For coding agents llms.txt The whole integration and API reference in one fetch. Complete, so your agent needs nothing else. /llms.txt → Specification The frozen contract The contract, API and hosted pages that every integration relies on, and how they may change. /spec →

Nothing to sign up for

No account, no API key, no SDK. Your wallet is your login; the chain is your database.

Your money, directly

sub3 never holds funds. Each payment is split on chain and sent to your wallet at once.

1% + $0.05

Per payment, nothing else; a handle is $20 once. A year of a tier costs ten months. USDC on Arc.