US-Nubits is a cryptocurrency whose price is pegged to the USD. As part of its pegging operations,  when BTC price rises, Nu uses "parking" to rein in extra US-Nubits on the market and pay park rates as interest.

Now you have a chance to lend your bitcoin with very good rates to Nu by buying US-Nubits and park them. Return for different park periods are

Park Period | Return
5.6 days | 0.27%
11.2 days | 0.62%
22.4 days | 1.38%
45 days | 2.77%
90 days | 6.4%

Just buy Nubits, park them (do it in your wallet), and the "interest" will be paid by the blockchain at the end of the period. Park now if you are interested as when BTC price starts to fall, high park rate will disappear. Once you park, your rate is fixed.

You can buy Nubits here (most liquid exchanges are poloniex and the NuLagoon Tube).

Real time rates (in APR) can be found at http://blockexplorer.nu/status. You can also find a parking calculator, a tutorial, and an FAQ at www.parkyournubits.com or http://parkyournubits.com