Payment · authentication · bitcoin: / ethereum: URI (BIP-21 · EIP-681)

A payment request the wallet understands

Address, amount and label in the standard bitcoin: or ethereum: URI. The wallet fills in the payment; the person confirms. Works on a counter card, an invoice, a donation poster.

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Opens the generator with this type selected. Everything happens in your browser.

Round WIA Code carrying a Bitcoin payment request
Rendered by the same engine as the generator. Point the WIA scanner at it — or a plain camera at the small booster QR in the middle.

What the code carries

A BIP-21 (Bitcoin) or EIP-681 (Ethereum) URI: the address, an optional amount and a label. These are the same URIs wallet QR codes carry, so any wallet that scans QR understands the content.

bitcoin: / ethereum: URI (BIP-21 · EIP-681)

What happens when it is scanned

  1. The scanner reads the address and amount from the code — offline.
  2. It shows the full address on a card so it can be checked before paying.
  3. One tap hands the request to the wallet app; the person confirms the payment there.

Why a WIA Code for this

The full address is shown before it reaches the wallet — check the first and last characters as you would anywhere.
Long addresses and labels fit comfortably; a same-size QR is tight.
A donation code that looks like your cause — a heart, a leaf, your seal.

How much fits

Measured on the live engine (bytes of content, after error correction). The QR column is a standard QR code of the same printed size, for comparison.

GridWIA Code (bytes)Same-size QR (bytes)With booster QR
S · 64 modules · round23960—
M · 96 modules · round608151—
L · 128 modules · round11283221092

This page's example is 80 bytes. The booster QR is a small standard QR placed in the centre so phones without the WIA scanner still get somewhere useful — it leads to the web scanner, which then reads the full code.

Before you print it

A payment code is public by nature — only the receiving address is inside. Never put a private key or a seed phrase into any code.

Questions people ask

Which coins are supported?
Bitcoin-style BIP-21 URIs for the coins in the generator's list, and Ethereum EIP-681 including a chain id.
Does the wallet need the WIA scanner?
The WIA scanner reads the code and hands the URI to the wallet. A plain camera reads the booster QR and opens the web scanner first.
Can I fix the amount?
Yes, optionally; leave it empty for a donation code.
Is the address verified by WIA?
No. WIA renders what you enter; check the address in the wallet before sending, as always.
Can I put a private key in a code?
Never. Only receiving addresses belong in a public code.
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Other kinds of content

A note only the passphrase opensAll kinds of content →

WIA Code is a radial-symmetry 2D code. The content lives in the code; there is no server in between when it is scanned. Generated with the WIA Code engine · scannable · no account needed