Flux Docs

Flux is a payment-streaming app on Arc. Instead of paying in a single lump, money flows continuously — second by second — in USDC.

The sender escrows funds once; they vest linearly to the recipient over a chosen window. The recipient can withdraw whatever has streamed at any time, and either party can cancel, which settles both sides fairly in a single transaction.

• Real-time: value moves every second, not once a month.
• Non-custodial: only the smart contract holds the escrow — no middleman.
• Fair cancellation: recipient keeps what streamed, sender reclaims the rest.
• Built on Arc, where USDC is the native gas token and settlement is sub-second.
• Currently live on Arc Testnet (test funds only).

1. 1
   Create a stream

   The sender escrows USDC and sets a start and end time.
2. 2
   It vests linearly

   At any moment, vested = total × time elapsed ÷ duration. Halfway through, half is the recipient's.
3. 3
   Withdraw anytime

   The recipient pulls whatever has vested but not yet been withdrawn — at second one or day thirty.
4. 4
   Cancel anytime

   Either party can stop the stream. The recipient keeps the streamed portion; the sender is refunded the remainder.

You need three things before your first stream:

• A web3 wallet such as MetaMask or Rabby.
• Arc Testnet added to that wallet (details below).
• Some testnet USDC — used both for gas and to stream.

Add Arc Testnet

Get testnet USDC

On Arc, USDC is the gas token, so you need a little just to transact. Grab some from Circle's faucet, then come back to Flux.

1. 1
   Go to Dashboard

   Connect your wallet and make sure you are on Arc Testnet.
2. 2
   New stream

   Enter the recipient address, the amount, and a duration.
3. 3
   Approve USDC

   Your wallet asks to approve the contract to move your USDC.
4. 4
   Confirm

   A second wallet prompt opens the stream. From here it flows automatically.

Withdraw — as the recipient, open the stream in Dashboard (Incoming) or Earnings and press Withdraw. You receive everything that has streamed so far.

Cancel — either the sender or the recipient can cancel. In one transaction the recipient keeps the streamed portion and the sender is refunded the rest. A cancelled stream cannot be restarted.

A Flux payment link is how other people stream USDC to you — it is not you paying.

1. 1
   Create a link

   On the Request page, set an amount and duration (or leave them open), then copy the link.
2. 2
   Share it

   Send the link to whoever should pay you.
3. 3
   They pay

   They open the link, connect their own wallet, and start the stream.
4. 4
   You get paid, live

   USDC flows to your wallet every second — watch it in Earnings.

Want a permanent page with several tiers instead of a one-off link? See Flux Pages below.

A Flux Page is your own shareable streaming-payment page — like a tip page, but supporters stream USDC to you by the second instead of paying once.

1. 1
   Open the builder

   Go to the Page builder, set a display name, a short bio and an accent colour.
2. 2
   Add your tiers

   Create your own tiers — each with a label, an amount and a duration (e.g. Coffee — 5 USDC over 7 days).
3. 3
   Copy & share

   Copy the link and put it in your bio, socials, or anywhere.
4. 4
   Get paid

   A visitor picks a tier, connects their wallet and starts the stream; you watch it arrive in Earnings.

Turn your Flux Page (or any pay-link) into a button you can place anywhere — your GitHub README, a blog, Notion, or a website.

1. 1
   Open the Embed page

   Paste your Flux link and choose a button label.
2. 2
   Copy a snippet

   Grab the HTML button for websites and blogs, or the Markdown badge for a GitHub README or Notion.
3. 3
   Paste it anywhere

   Anyone who clicks it opens your link and can start streaming to you.

The Earnings page shows everything streaming to you: a live claimable total, how much you have received, your active streams, and your inflow rate per day.

Use Export CSV to download a record of your incoming streams — handy for bookkeeping or taxes.

The Bridge page moves USDC you have received on Arc to another chain using Circle CCTP. Your USDC is burned on Arc and minted natively on the destination — no wrapped tokens.

• This moves funds across chains and cannot be reversed — test with a tiny amount first.
• You may need a little gas on the destination chain for the final mint step.
• Your wallet may ask to switch networks during the process.
• CCTP moves USDC chain-to-chain, not to a bank. To cash out, bridge to a chain with an exchange or Circle Mint, then off-ramp there.