https://twitter.com/TfLWaystoPay/status/627079160272453632

As per the single fare finder, the adult fares are £5.40 Peak (0630-0930
weekdays) and £3.80 Off-peak (or £2.50 with the 'national Railcard'
discount loaded on an Oyster, only during the Off-peak window).

For comparison paper tickets cost £6 for an Anytime single, £10.90 for
an Anytime Day Return or £7.60 for an Off-Peak Day Return (valid from
10.00am onwards from Stratford to St P, and from 09.30am onwards from St
P to Stratford).

(So the PAYG pricing logic appears to be that a PAYG Peak single is half
a paper Anytime Day Return, and a PAYG Off-Peak single is half a paper
Off-Peak Day Return.)

No through journey fares show, e.g. there's no through journey fare for
Stratford Intl to St P by highspeed then onto Oxford Circus by Tube. Nor
do there appear to be any daily (or for contactless, weekly) caps.

So it just seems to be a straightforward standalone offering - a bit
like paying by Oyster for a ride on a Thames Clipper or the cable car.
(Of course the SE Highspeed service exists outside the zonal system in
the first place.)

Regular commuters would do better to consider a (paper) season ticket -
£31.60 for a week, £121.40 for a month etc.

Still, it's welcome as it cuts out the faff of a ticket purchase. And
it's the easiest, if not the cheapest, way from King's Cross or St
Pancras to City Airport in the Royal Docks (with a direct DLR service to
LCY from Stratford Int'l station).

An aside... when is Newham going to announce its UDI so the station's
name becomes appropriate?