What it’s quoted at, minus what it clears at.
A listed price is an ask. A settlement is a fill. The distance between them is the basis, and from the 5 October 2026 futures listing we publish it every day — our open index, their settlement, and the gap.
Daily
basis is our median listed on-demand price minus their settlement, per GPU-hour. Positive means the tape is quoting above where the contract settled; negative means it is quoting below.
| contract | month | date | our median | basis $ | basis % | vs PCIe |
|---|
Why an H100 basis needs two numbers, not one
Silicon Data’s H100 index does not resolve to a single form factor. Ours deliberately do, because H100 SXM and H100 PCIe are different products at different prices — and the spread between those two is usually wider than the basis itself.
So the headline basis is against SXM, the dominant rental form factor, and the PCIe basis is published in the same row. A reader shown only one number would draw a confident wrong conclusion, which is worse than being shown nothing.
What we publish, and what we don’t
- We publish our median and the gap. Both are ours. Both recompute from the sealed tape.
- We do not mirror their feed. One settlement a day, keyed by hand, linked back to CME for the print. Their settlement is not a column in our CSV.
- We won’t pretend that’s a wall. Given our number and the gap, theirs is arithmetic. What it avoids is running a machine-readable mirror of a licensed series, which is the part that would actually matter.
- A day we can’t match, we show as unmatched rather than dropping the row — a silently missing day reads as a day with no gap.
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