The API answers JSON over HTTPS, with no key.

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List the opportunities

The best pairs first, with the return on margin at 10x leverage:
Each opportunity gives the asset, the long and the short leg (venue, market id, the venue’s symbol for it, its quote asset, the leg’s funding as an APR, its maximum leverage, how often it settles), the gross APR on notional, and the APR on the margin you post.

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Quote a pair at your size

Take a pair from the list and price it for $10,000 per leg held 30 days:
The quote reads both venues’ order books: it gives the net APR after fees and the cost of crossing the books twice, the round trip’s cost in dollars, the hours of carry that pay it back, and why a figure is missing when it is.

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Next

How it works

What each figure means and how it is computed.

API reference

Parameters, answers and errors.