# Get a timeline

Source: https://langbot.ai/docs/api/sim/get-timeline

`GET /v1/sim/events/{event_id}/timeline`

One page of an event's merged timeline (feed events and order books in replay order) as NDJSON, to run your own strategy locally.

**Auth.** An API token: `Authorization: Bearer lb_…` ([create one](https://langbot.ai/app/tokens)). Signed-in web sessions work too.

**Limits.** One Sim run (20 a month on Free, 100 on Builder, unlimited on Standard).

## Parameters

### Path parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `event_id` | string | yes | A replayable event (`ev_…`). |

### Query parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `cursor` | string | no | `next_cursor` from the previous page's `page` line. |
| `limit` | integer | no | Lines per page. 1 to 50,000. Default `20000`. |

## Request

**curl**

```bash
curl "https://api.langbot.ai/v1/sim/events/ev_kxearningsmentiongs_26oct13/timeline?limit=2" \
  -H "Authorization: Bearer $LANGBOT_API_TOKEN"
```

**Python**

```python
from langbot import LangbotClient

async with LangbotClient() as lb:  # reads LANGBOT_API_TOKEN
    async for line in lb.sim_timeline_lines("ev_kxearningsmentiongs_26oct13"):
        print(line)
```

**TypeScript**

```ts
const res = await fetch("https://api.langbot.ai/v1/sim/events/ev_kxearningsmentiongs_26oct13/timeline?limit=2", {
  headers: { Authorization: `Bearer ${process.env.LANGBOT_API_TOKEN}` },
});
console.log(await res.json());
```

## Response

`200 OK`

```text
{"kind":"manifest","v":1,"event_id":"ev_kxearningsmentiongs_26oct13","window":{"from":1760362200000,"to":1760369400000},"markets":[{"ticker":"KXEARNINGSMENTIONGS-26OCT13-PRIV","result":"yes"}],"delay_ms":0,"fee_model":{"kalshi":"…"},"default_latency_ms":[250,2250,5250]}
{"kind":"book","ticker":"KXEARNINGSMENTIONGS-26OCT13-PRIV","ts":1760362201000,"yes_bid":0.41,"yes_ask":0.44,"bids":[[0.41,120]],"asks":[[0.44,80]]}
{"kind":"event","id":"evt_01K7…","type":"phrase_detected","phrase":"private credit","t_emitted":1760362450000}
{"kind":"page","count":2,"next_cursor":"eyJ0Ijo…"}
```

`application/x-ndjson`: a `manifest` line, then `event` and `book` lines, then a `page` line with `next_cursor` (`null` on the last page). Only the first page counts as a Sim run. `langbot sim run -s my_bot.py` reads it for you.

## Errors

| Status | `code` | When |
|---|---|---|
| 401 | `auth_required` | No token was sent. |
| 401 | `token_invalid` | The token was not recognised (mistyped, revoked or expired). |
| 422 | `validation_error` | A parameter failed validation; `detail[].loc` names it. |
| 429 | `quota_exceeded` | This month's Sim runs are spent; `quota.resets_at` says when they reset. |
| 429 | `rate_limited` | Over your request budget; wait `Retry-After` seconds. |

Every error body is `{"detail": …, "code": "…"}`; branch on `code`. All codes: [Errors](https://langbot.ai/docs/api#errors).