How do I generate a QR code for a Bitcoin address with amount?

Question

The closest I've gotten is from blockchain.info

https://blockchain.info/qr?data=1Agb153xWsbqS9vt8gP4vBFKHkAchLMdSX&size=200

I can't find any documentation for other parameters like 'amount' though?

I did find a service that does a generate a QR code with an amount. I just have never heard of them before (trust?). And am not sure what to put for 'error correction level' or 'code square size' given this code will be displayed on a website.

Answer 1

There are many ways you can generate a QR code!

IMO, the most trusted way to generate a QR code is through google!

You can simply make an tag with this link:

https://chart.googleapis.com/chart?chs=250x250&cht=qr&chl= 12kQMUkB9QJu9X5JP9H9M2qMUmrGtDakkV

Im not sure what you mean by "trust". You dont really need to worry about trust since these are just the public keys, and not the private keys.

I hope this helps! (My BTC address is in the QR code!)

Answer 2

I use GoogleApi to generate QR codes for bitcoin and altcoins

The syntax is a bit tricky since the "data" portion (chl=*), is itself urlencoded (use %26 instead of &):

https://chart.googleapis.com/chart?chs=225x225&chld=L|2&cht=qr&chl=bitcoin:1MoLoCh1srp6jjQgPmwSf5Be5PU98NJHgx?amount=.01%26label=Moloch.net%26message=Donation

You can make a QR code for other altcoins by changing the chl=bitcoin:1(...) to chl=litecoin:L(...), etc

I made a multi-coin QR code generator for my website with all the available options:

http://resources.moloch.net/qr-generator

The only thing Google is missing, is to verify the address is legitimate (and not a typo), which my api handles seperately