[pathikrit]

Also, https://walla.by/the-wallaby-card - they have been around even longer.

[jack-r-abbit]

I think Wallaby works differently by being a new plastic card you use and they dynamically route your charges to which ever registered card will give you the best return (cash back, airline points, etc).

[chimeracoder]

I've been using Wallaby for a while (the company I used to work at invested in them).

They're really awesome.

I haven't used Coin or Echo for comparison, though.