The GPU index

One number per crop per hour: the median rental price in USD per GPU-hour across three public quotes. Nothing in it needs an API key, so anyone can fetch the same books and get the same number.

H100 SXM, one hour: the index is the middle of the three, 2.69 $/GPU-hour

Sources

Source	Endpoint	Value used
Vast.ai	`console.vast.ai/api/v0/bundles/`	Median of `dph_total / num_gpus` over rentable on-demand offers for the model
RunPod community	`api.runpod.io/graphql` `gpuTypes`	`communityPrice`
RunPod secure	same query	`securePrice`

On Vast.ai, offers from verified hosts are used first. When a model has no verified offer that hour, every rentable offer is used, and the snapshot says so in vast.basis.

Method

At minute :09 of each UTC hour the keeper fetches both books once.
For each crop it takes the Vast.ai median, the RunPod community price and the RunPod secure price. A price of zero or a failed request drops that source and is noted in dropped.
The index is the median of the remaining values, rounded to 4 decimals. With fewer than two values the crop gets no point that hour.
The keeper posts post(crop, hour, price, sources, raw). The contract stores keccak256(raw) and refuses a second point for the same crop and hour.

The raw snapshot

The snapshot is compact JSON with every offer that went into the Vast.ai median, as [offerId, $/GPU-hour] pairs, and both RunPod prices:

{
  "v": 1, "crop": "H100 SXM", "hour": 498077,
  "vast": { "gpu_name": "H100 SXM", "basis": "verified",
            "offers": [[50189142, 3.5962], ...], "median": 3.594 },
  "runpod": { "id": "NVIDIA H100 80GB HBM3", "community": 2.69, "secure": 3.99 },
  "dropped": [], "sources": 3, "index": 3.594
}

It is served at /index/raw/<hash>.json. The site reads it from the post's calldata and checks the hash before answering, so the file cannot differ from what was posted.

Recompute a point

The verifier takes a hash, fetches the snapshot, hashes the bytes, rebuilds the median and compares it with the price stored on GpuIndex. The same module runs in Node:

import { verify } from "https://gpuacres.org/verifier/verify.mjs"
console.log(await verify("0x5c1e..."))
// { hashOk: true, recomputed: 2.69, posted: 2.69, match: true }