# List trials

Source: https://langbot.ai/docs/api/research/list-trials

`GET /v1/research/trials`

Your research ledger, every calibration query and bench run, with how many you ran in the last 30 days.

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

**Limits.** Counts against your plan's API requests (60, 600 or 3,000 a minute on Free, Builder and Standard).

## Parameters

### Query parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `kind` | string | no | `calibration` or `bench`. |
| `limit` | integer | no | Page size. 1 to 200. Default `50`. |

## Request

**curl**

```bash
curl "https://api.langbot.ai/v1/research/trials?limit=1" \
  -H "Authorization: Bearer $LANGBOT_API_TOKEN"
```

**Python**

```python
import os

import httpx

r = httpx.get(
    "https://api.langbot.ai/v1/research/trials?limit=1",
    headers={"Authorization": f"Bearer {os.environ['LANGBOT_API_TOKEN']}"},
)
print(r.json())
```

**TypeScript**

```ts
const res = await fetch("https://api.langbot.ai/v1/research/trials?limit=1", {
  headers: { Authorization: `Bearer ${process.env.LANGBOT_API_TOKEN}` },
});
console.log(await res.json());
```

## Response

`200 OK`

```json
{
  "ts": 1793500000000,
  "count_30d": 4,
  "window_ms": 2592000000,
  "count": 1,
  "trials": [ { "id": "trl_01K8…", "kind": "calibration", "request": { "speaker": "powell", "basis": "mid" }, "summary": { "n": 214 }, "created_at": 1793490000000 } ]
}
```

Every configuration you try is another comparison: with k trials at 90% intervals, about k/10 will look like something by chance.

## 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 | `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).