Please round out your question more.
If you are asking about who rents bees, there are a number of ads in American Bee Journal looking for beekeepers to pollinate the almonds this spring (Feb 2005).
For local pollination contracts, you just need to knock on the doors of any local apple orchards you might have. I am not aware of any other crops in North Dakota that require paid pollination to produce. So many beekeepers migrate to North Dakota after doing almond and fruit in California/Washington, that there is bee saturation in many areas. Perhaps someone in seed production.
Regarding the contract itself, there have been articles written in the past in either American Bee Journal or Bee Culture, I don't remember which. Some do a handshake, while others do a three page document.
There used to be a sample at
www.beepollination.com
A quick glance @ Oct 2005 American Bee Journal, I see at least 8 ads for almond pollination(looking for bees) all in CA, some with advertised rents of $48-$52/hive. I know some get more.
If you can move your bees out of North Dakota, to California, there is huge demand.
If you are stuck in ND, you will find sparse demand.