> For the complete documentation index, see [llms.txt](https://docs.strikelabs.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.strikelabs.app/api-reference/info.md).

# Info endpoint

Public market data. No authentication, no token, no rate limit.

All info requests are `GET`.

## Meta

The listing universe with a live underlying price for each symbol.

```bash
curl https://api.strikelabs.app/v1/meta
```

```json
{
  "instruments": [
    { "symbol": "NVDA", "spot": 219.34, "feedFresh": true },
    { "symbol": "TSLA", "spot": 331.80, "feedFresh": true }
  ]
}
```

| Field       | Type    | Meaning                                                                                                           |
| ----------- | ------- | ----------------------------------------------------------------------------------------------------------------- |
| `symbol`    | string  | The underlying.                                                                                                   |
| `spot`      | number  | Live underlying price.                                                                                            |
| `feedFresh` | boolean | Whether the price feed is current. A stale feed still reports its last price — check this before trusting `spot`. |

## Series

Every live series for one symbol.

```bash
curl "https://api.strikelabs.app/v1/series?symbol=NVDA"
```

```json
{
  "series": [
    {
      "seriesId": "NVDA-1786492800-C-207",
      "sid": 231,
      "symbol": "NVDA",
      "expiryTs": 1786492800,
      "expiryCutoffMs": 1786492800000,
      "right": "C",
      "strike": 207.0
    }
  ]
}
```

| Parameter | Required | Meaning                       |
| --------- | -------- | ----------------------------- |
| `symbol`  | yes      | Underlying, case-insensitive. |

| Field            | Meaning                                                                  |
| ---------------- | ------------------------------------------------------------------------ |
| `seriesId`       | Canonical contract name. See [Series IDs](/api-reference/series-ids.md). |
| `sid`            | Integer alias, process-lifetime only. Do not persist.                    |
| `expiryTs`       | Expiry, unix **seconds**.                                                |
| `expiryCutoffMs` | Last moment orders are accepted, unix **milliseconds**.                  |
| `right`          | `C` or `P`.                                                              |
| `strike`         | Strike price.                                                            |

Only **live** series are returned — settled and expired contracts are filtered out, so everything you receive is tradable. Responses are large; group by `expiryTs` to build an expiry list, then fetch one chain.

## Chain

The tradable board for one symbol and one expiry: resting quotes with the maker's implied volatility and delta, plus open interest and today's volume.

```bash
curl "https://api.strikelabs.app/v1/chain?symbol=NVDA&expiryTs=1786492800"
```

```json
{
  "symbol": "NVDA",
  "expiryTs": 1786492800,
  "spot": 219.34,
  "sessionOpen": false,
  "rows": [
    {
      "strike": 221.0,
      "call": {
        "seriesId": "NVDA-1786492800-C-221",
        "sid": 259,
        "bid": { "price": 0.35, "qty": 5447.0 },
        "ask": { "price": 0.41, "qty": 5447.0 },
        "mid": 0.38,
        "iv": 0.366307,
        "delta": 0.254581,
        "openInterest": 0.0,
        "volume": 0.0
      },
      "put": { "…": "same shape, delta negative" }
    }
  ]
}
```

| Parameter  | Required | Meaning                                                            |
| ---------- | -------- | ------------------------------------------------------------------ |
| `symbol`   | yes      | Underlying.                                                        |
| `expiryTs` | yes      | Expiry in unix **seconds**, from `/v1/series`. Must be an integer. |

**`bid` and `ask` may be `null` independently.** A one-sided row is normal: an option cheap enough that the maker's edge exceeds its value gets an offer and no bid. Guard for null before computing a mid — `mid` is only present when both sides are quoted.

`sessionOpen` reports whether the underlying's primary market is open. Strike itself is always open; the flag is informational.

## Book

The resting order book for one series, aggregated by price, up to 12 levels per side.

```bash
curl "https://api.strikelabs.app/v1/book?seriesId=NVDA-1786492800-C-221"
```

```json
{
  "seriesId": "NVDA-1786492800-C-221",
  "bids": [ { "price": 0.35, "qty": 5447.0 } ],
  "asks": [ { "price": 0.41, "qty": 5447.0 } ]
}
```

Bids descend from the best bid; asks ascend from the best offer. Both arrays may be empty. An unknown `seriesId` returns `404`.

## Tape

Recent public prints for a symbol, newest first, capped at 50.

```bash
curl "https://api.strikelabs.app/v1/tape?symbol=NVDA"
```

```json
{
  "symbol": "NVDA",
  "fills": [
    {
      "seriesId": "NVDA-1786492800-C-227",
      "price": 0.01,
      "qty": 21818.0,
      "side": "buy",
      "ts": 1786460756556
    }
  ]
}
```

`side` is the **taker's** side: `buy` means someone lifted an offer. `ts` is unix **milliseconds**.

The tape is an in-memory ring of the last 100 prints per symbol and is not durable — a venue restart empties it. For a permanent record of your own fills, use [`/v1/me`](/api-reference/exchange.md#account).


---

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