# Point in time (/point-in-time)

`GET /v1/listings` accepts `as_of`, an ISO 8601 UTC time. It returns each public listing as it was last recorded at
or before that moment:

```bash
curl "https://data.tryopengrid.com/v1/listings?gpu=nvidia-h100-80gb-sxm5&as_of=2026-10-01T00:00:00Z" \
  -H "Authorization: Bearer $OPENGRID_API_KEY"
```

## What counts as live [#what-counts-as-live]

A listing is included if it had been seen by `as_of` and was still being seen then (within its last sighting plus a
few polls). This is the same rule the price charts use, so a point-in-time read agrees with history.

## What is and isn't historical [#what-is-and-isnt-historical]

- **Historical:** price, availability, capacity and observation time at that moment.
- **Current:** static fields such as region and specs.
- **Null:** `original` (currency conversion) and `trust`, which are not stored historically.

A future `as_of` is a `422`.

## Other ways to look back [#other-ways-to-look-back]

| You want | Use |
| --- | --- |
| A GPU's low, median and high over time | `GET /v1/markets/{gpu}/history` |
| Each provider's price line for a GPU | `GET /v1/markets/{gpu}/history/providers` |
| Every recorded change of a listing | `GET /v1/listings/history` |
| An index over time | `GET /v1/indices/{index}/history` |
| A whole past day, in one file | [Bulk exports](/bulk-exports) |